Well, not a 1919 but so many M2 50 cal BMG's I don't remember. I could probably still set the head spacing and timing on one in dark or blindfolded. That is due to getting to have it and multiple other guns disassembled in a big box and having to do that. Fun times back then.
This is the kind of stuff I used to draw on sticky notes while waiting for machines to finish at work. Making basic bolts by hand is easy but any real mechanism with nothing but a crappy drill press and a grinder good luck. Nothing is more disheartening than having the knowhow and skills to make something and no resources to do it.
It's not hard. I used to have vague instructional videos on my channel on building a modified version of the Swedish K. All the tooling you need, besides the welder, is a grinder, hand drill and bits, and a thin hobby file for the extractor claw. Solid bolts for 9mm though. Making that delay mech in the bolt by hand could possibly be a test of patience
Mark there is absolutely a market for delayed blowback in 10mm, I hope you are contemplating a production run and make it work, so I have a reason to own a Serbu! glad to see you got the video up finally. Congrats on figuring it and the patience needed to get the video edited!
The extrema pistol grip angle is for familiarity to a regular rifle stock that was in common use at the time. Always enjoy your show and tell and humor. Thanks.
The "momentum amplifier" term is probably equivalent to the original term of an "accelerator". In the FAMAS the part responsible for delaying the action is called an "accelerator lever"
Basically you chance force for distance. The case is pushed backward, you don't want it to move to fast, so you use a mechanism, that trades force for distance.
As an old school machinist I never had the opportunity to learn/work with cnc or this cad. Thing ,lol but I can see all the machining steps and metal pressing steps needed to make this. Old school works just no computer other than the one God gave you.
I'm no machinist but get what your saying. Two things spring to mind, STEN made by a man in a garage sent to the Brit War Department. The Owen made by a teenager in a 1940s home garage and left to rust at the side of his house in a 🥔 sack 😂
Mark most people don't fully understand the "art" of gun building, nicely stated. As a fellow gun nut and gun builder I totally get it. Also you touching on the subject of having a certain level of arrogance to do so is spot on!
This lever will be very heavily stressed .. this is why the German ditched levers and went with rollers instead, because they can withstand much more force.
By point of reference on blowback bolt mass, Winchester used about 2 1/2 pounds on their straigh blowback model 1910. Ballistically, that's like a 10mm extra extra long so a bit hotter than modern 10mm but with the same bullet weight and basically the same case diameter. Even with that huge bolt mass, they have a stupidly high bolt velocity and eject brass into low earth orbit. Need crazy stiff magazine springs for the feed to keep up with the bolt or they jam horribly.
0:55 the Type 1 FG42‘s grip is angled so far because it puts your hand at the same angle as the grip on a Kar98K. That was actually a good idea since they would have been so used to that angle and it would‘ve been better for the soldiers issued the rifle.
That's such an odd concept because the gunner would be a specialist role like the submachine gunner would. You'd think they'd try to match it to say an MP40 grip instead
@ I believe the FG42 was originally meant to replace the Kar98K for Fallschirmjägers and eventually the entire Wehrmacht (Hitler loved the concept of the rifle) so I guess it kinda makes sense but what you said is probably why they switched the grip style for the second type.
I did a dynamic analysis to a rolled delay system a couple years ago using simulink. The way I understand this system is an inertia amplifier since the bolt carrier is forced to accelerate quicker (and has more mass). I think my theory is basically the same as yours since the force is the momentum differential. Great video Mark
+1 Wehrmacht muscle memory from Gew 98 and Karabiner 98k. The German personnel parachute systems tucked, the suspension lines joined into a single riser that attached to the harness near the center of the back, minimal contol or steering. no Fallschirmjaeger would be firing an FG42 during descent.
That handle design is deliberate, it means it can be fired from two positions, either shouldered like a normal rifle, OR also hanging lower on a shoulder strap, "fired from the hip" where the forearm is over the stock.
Changing doctrine and posture is REALLY HARD. Standing square to the target and presenting my plate coverage and tucking the elbow, holding the rifle up high almost off my collarbone takes thought. My muscle memory is still bladed stance elbow out 45 degrees. Changing my grip to a more vertical one has helped though.
If you try to find information on such systems you don't want so search "delayed blowback" but "retarded blowback" instead, because a shift in meaning happed over time. For example you will find those systems in Chinn's "The Machine Gun Vol. IV Design Analysis of Automatic Firing Mechanism" on page 54, while delayed blowback can be found at page 42.
I think you should just finish this guys design with the accelerator lever. Put it in cad and make it a smooth arc if you decide thats what it needs. Ive used the cad programs for drafting and designing that had the added wieght charts for spans and stress ect ect. Would give you all relevant fastener sizes and so on. Used one similar for engine design. Im sure there is one just for specific forces dealt with in firearms design.
WG was where I first got bitten by the bug. Those guys were instrumental in helping me build some .... things. Making this into a gas operated rifle would be a very interesting thing to do. Although, that lever delayed is a pretty cool idea.
The system can be also explained by the so called French formula. Its "bolt head mass" + ("bolt carrier mass" squared "mechanical translation" ) = virtual mass For the Famas it's 140g + ( 240g squared 3 ) equals 2300g Meaning that that the Famas's real total bolt mass is only 380g, but due to its mechanical translation of 1:3 (for every millimeter of bolt head travel there are 3 millimeters of bolt carrier travel) the virtual mass of the Famas's bolt equal 2,3 kilograms.
FG-42 pistol grip was made that way to fit M98 Mauser drop crates. Fallschirmjager ( paratroopers) jumped with Browning pistol while their rifles were dropped in the crate. This was a disaster in Crete.
Bloke on the Range has a video about roller delay ("Roller Locking vs Delay: BotR Addendum") where he describes roller delay as a "down gearing system", re: "momentum amplifier".
They'll just regulate ALL firearm parts. Your whole crowd loves to push the envelope and poke the bear. The bear does have claws. Especially in this day and age.
Scuffed CoD WaW meta lookin ahh gun. I honestly love it, it looks like a ppsh and a greasegun squeezed out a welded baby. The angle on that grip makes me feel woozy. Also, 10mm lever delay? that thing is a train made of _recoil._ lolol.
for measuring the ratios, if you don't want a jigged setup - flat plate against the bolt face that extends past it (can likely do with while it's on its side with a gauge block). Micrometer as the moving device (against plate and lugs), for every X distance you close the mic, measure the gap that opens.
Somewhere I read that the Browning Auto-5, long recoil action, had a "recoil accelerator" a word combo I had never heard before. :) It was a spur cammed with the bolt so when the bolt was going back releasing the barrel to go forward, the spur would kick the bolt back further to guarantee the action spring behind the bolt had enough compression to push it forward.
Involute profile I think is what you'd want for the lever profile, just like a gear. That way the point of contact is always at the same radius from the pivot, and the pressure angle remains unchanged.
Or a non- linear curve. That would be the electronics engineering term. Discontinuance is something I’ve never heard of. Math is base for science and electronics. I enjoy working with smart talented folks that have different approaches to solve the same problem. Troubleshooting with the skills and materials you have. We benefit from this stuff, there are vehicles that run off of electric, gasoline and diesel fuel all sharing the road at the same time and have unique benefits. Thankyou for sharing these items. Another problem is a future one is that of manufacturing production. That also has weight to design and features.
There are four main factors for the formula: 1. how long is the power leaver 2. how long is the working leaver 3. how steep is the surface the power leaver is pressed against 4. how steep is the surface the working leaver is pressed against Those 4 questions has so be answered for every millimeter of movement. You will find out, the the "valley", were the lever in rested in the weapons housing, is most important because is controls the leavers movement. As soon as the leaver leaves this valley and its contact angle reaches a flat 90° the leaver no longer rotates and the acceleration of the bolt carrier stops.
Lever delayed done correctly would be interesting. Finding the shortcomings of the design then correcting that and make it work would be cool. Gas operated would be interesting too.
First step would be to create a chart with measurements taken the following way. Fix the gun by its frame and stick a rod into the barrel a way were very fine adjustments could be made. I suggest something featuring a worm gear, like a second wise. Push the rod only 1 millimeter (or thousands of an inch) into the barrel. Then measure the distance the bolt carrier moved and the distance of the gap created between the bolt head and the carrier. Continue until this gap no longer increases in length. Then you can use the French formula, some one already posted, to know what exact "virtual" mass the bolt have at a specific moment. Those systems are nothing like simple blowback but with a rapidly changing in (virtual) mass. Spoiler This thing will most likely need a fluted chamber.
I'm far from a physicist but are you sure the total momentum's being increased? Wouldn't that require additional energy being put into the entire system somehow? From what I know of the lever delay system it seems like it just temporarily changes where the force is being applied within the bolt system itself. The total energy in the bolt is the same it's just that because the mechanism forces part of the bolt to hold still longer the mass that would normally be required to do that in a simple blowback is no longer required. Someone correct me here because again I'm not a physicist.
It’s cool. Idle hands are the devil’s workshop. The guys tinkering,thinking & working with what he’s got. & enjoys it. Theres nothing wrong with that. Like it.
I’d like to see lever delayed but whatever you want. Do you think the arc of the lever is too short? I’m one of the few that get excited about the math parts
I guess the grip angle on the first FG-42 was either thought to be more "streamlined" for use by parachute troops (less likely to snag on all the straps and gear you're wearing) or maybe it was supposed to resemble the classic rifle grip more as the paratroops were primarily issued Mauser rifles. Or both. Or I'm just completely wrong, idk.
Lever delayed is such qn underused and cool system i would love to see you give that a go. It seems to me it has the potential to be as good as roller delayed blowvack but without a lot of the tolerance requirements
I get the idea that lever delayed is grossly underutilized and underappreciated. It's finicky, but in its core incredibly simple and could lend itself to quite economical production. Roller delayed rifles are notorious for their soft recoiling compared to gas operated rifles. There aren't many samples for the lever delayed rifles besides the FAMAS, which happens to be incredibly stout I hear, but may have traded reliability for recoil. And I think you can fit a lever delayed action in a handgun. In a parallel universe the alien pistol would be lever delayed
Seems like the highest peak in stress on that accelerator lever should be at fully closed just after firing, and then have fallen off a fair bit by the time it hits that bump, so a smooth roll-off in leverage would be nice but shouldn't be the failure point. Then again, I haven't run the finite element analysis on it so maybe I'm just dumb and wrong.
That is actually really cool for what it is. That grip actually looks CA legal the way it sits so far back lol doesn’t look like you can get the webbing of your hand under the receiver. Pretty interesting overall. Nice video.
The technology to 3D print the majority of the firearm in metal is available now. If you desired, you can 3D print Inconel exhaust manifold. That material and method would defiantly survive the firearm environment.
As a non-math person I am totally lost but still find it fascinating. I use the Kentucky Ballistics Windage method. I also keep a thumb free just in case.
Since I’m in orlando , do you do shop tours ? I’ve got a serbu shorty mossberg 500 that could use a once over. Plus I’ve got an extra spot at Berns steakhouse if ya ever accepted my FB request lol
My guess on the FG42 grip angle was so it would be more compact to store in a box since German paratroopers from what I remember would be dropped with only a pistol and their primary weapon would be dropped in a crate that they’d have to retrieve. Then the switch to a more comfortable grip might’ve been because they realized they no longer had air superiority and airborne insertion was no longer possible so the whole compactness to fit in a crate was no longer necessary.
The original goal of delayed blowback was to minimize manufacturing costs, so how far down the rabbit hole does someone need to go to machine that H peice? My vote is to try his design, if you gas operate it, it would probably be easier to start with a whole new bolt
If I understand correctly, the acceleration profile of the back half of the bolt is defined by the curvature on that link piece acting against a flat on the back half of the bolt. Seems to me you could spreadsheet a set of curves that correlate to different acceleration profiles to find a balance between what’s possible with heat treatment and material choice for the link and bolt pieces vs the recoil spring capacity and spring constant, to keep the forces within the ranges that steels can handle without needing to go with tungsten or titanium or whatever. A gas operated version might be easier to make work but it would be more complicated and less, uh, elegant as the mathematicians say. Also, why are you so surprised that the gun was designed without CAD? Throughout the history of firearms, how many were designed without it? Most of them, of course.
Yup,I'm watching it again, this time on YT.. I think the lever delayed action is cool ,but which would give you the best cyclic rate ? Lever delay ?Gas delay ,or blowback? Or does it really matter as long as it's accurate? It is a work of art. Keep it up . God Bless you and your loved ones
Cyclic rate is determined by a combination of many factors, and "best" is subjective based on how it is going to be used. If you want examples of very high rate of fire systems you could look at the AN-94 or G-11 rifles, or perhaps the M134a "minigun". Really the short answer to your second question is "No", and the long answer is "It depends..." followed by several pages of technical discussion.
Try the Luago approach; gas delayed blowback. On a larger platform like a pcc having some sort of active cooling is a little more reasonable. That way you can mitigate the overheating.
When you try to make a MAT 49 from memory and you're a few drinks in. Pretty neat though. Also, I believe the reason they had the weird grip angle on the first FG42 was because they wanted to maintain familiarity with the k98k, so the grip angle... kinda replicated the feel of holding a regular stock, I guess. Idk, I'm not German
The grip angle on the first FG42 was made at that angle to mimic the angle of the K98 and tto have less ability to catch something while on plane and in the parachute. The German parachute also had a single point attachmet so if someone tried shooting in the parachute they would start spinning, so that idea was quickly abandoned!
France, it's really not that bad compared with rifle ammo like .308 (30 to 80-90€ for 20) but still, I get the JHP from PPU/Partizan at 34€/50 and the FMJ from Sellier& Bellot at 38€/50. Honestly it's only 68 cts/bullet but still if you shoot regularly it can become expensive compared to 9x19 from like GECO whose JHP sells at 10€/20
Mathematica is really cool program, i used it to plot forces on hydraulic cylinders on tractor frontloader. As you said you need to know math, trigonometry exactly to do it. Enjoyed video as usual, thanks for posting.
Could you further lighten the bolt by adding a spring that stretches, connecting the front of the bolt to the rear of the bolt? That makes it even harder to open the bolt and maybe even helps prevent bounce back. Just thinking out loud.
Grand Power, has a similar strange design. Its horizontal over the bolt carrier as a part of the charging handle. One part attached with the bolt accelerates with the moment of inertia, (firing) then the second part which was effectively stationary in terms of relative speed gets snagged and dragged along as well, slowing down the initial mass that was thrust rearward. Pretty spiffy 👍
Why not make a roller delay for the recoil spring mechanism. Like the roller delay for an AR9. That would be cool. Use the lever and the roller delay and it will probably be smooth as silk. But another question. Was that thing semi auto? Or full. Be mint in full.
Can I send my wacky designs to Mark? 😂 I use CAD, probably not like a professional, but that’s the same story as my MiG welding! Thanks for uploading, I always enjoy these types of videos! You’re awesome Mark!
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
"if you have ever taken a 1919 apart."
No Mark, most of us have not had the pleasure.
lol yup
Well, not a 1919 but so many M2 50 cal BMG's I don't remember. I could probably still set the head spacing and timing on one in dark or blindfolded. That is due to getting to have it and multiple other guns disassembled in a big box and having to do that. Fun times back then.
I actually do have a 1919, and he’s right the bolt is almost exactly the same
@DB-yj3qc you forgot " not to get completely off topic BUT ... "
Some German soldiers had the pleasure during WWII. I dare say.
It's so wild that one person made that. It's giving me Luty flashbacks.
If Luty lived in rabid Kodiak bear country 😅 but brilliant design .
This is the kind of stuff I used to draw on sticky notes while waiting for machines to finish at work. Making basic bolts by hand is easy but any real mechanism with nothing but a crappy drill press and a grinder good luck. Nothing is more disheartening than having the knowhow and skills to make something and no resources to do it.
It's not hard. I used to have vague instructional videos on my channel on building a modified version of the Swedish K. All the tooling you need, besides the welder, is a grinder, hand drill and bits, and a thin hobby file for the extractor claw. Solid bolts for 9mm though. Making that delay mech in the bolt by hand could possibly be a test of patience
Luty vibes all over... Good man PHL
Dude frfr, the American luty
Mark there is absolutely a market for delayed blowback in 10mm, I hope you are contemplating a production run and make it work, so I have a reason to own a Serbu! glad to see you got the video up finally. Congrats on figuring it and the patience needed to get the video edited!
I vote for lever-delayed.
If you’re picking up the project for the novelty of the concept, follow through with bringing that concept to life.
I'm watching before you tube pulls it. They're ridiculous, thank you Mark 👍
I vote for tuning the lever-delay until it works.
The extrema pistol grip angle is for familiarity to a regular rifle stock that was in common use at the time. Always enjoy your show and tell and humor. Thanks.
the modern version of that is the cali compliant grips that aren't allowed to have the thumb wrap around the grip.
The "momentum amplifier" term is probably equivalent to the original term of an "accelerator". In the FAMAS the part responsible for delaying the action is called an "accelerator lever"
Basically you chance force for distance. The case is pushed backward, you don't want it to move to fast, so you use a mechanism, that trades force for distance.
In French c'est le LAI : le" Levier Amplificateur d'Inertie = Inertia Amplificator lever 🤗🍾🍷🍷🥮🥮🥖🥖🥖🗼
Does this one use lever to actuate the other mass (rear part) of the bolt. Thus can be called a lever delayed gun
@@Louis7.62X39 yes, and to amplify inertia is the equivalent of acceleration in English and French
As an old school machinist I never had the opportunity to learn/work with cnc
or this cad. Thing ,lol but I can see all the machining steps and metal pressing steps needed to make this. Old school works just no computer other than the one God gave you.
I'm no machinist but get what your saying. Two things spring to mind, STEN made by a man in a garage sent to the Brit War Department. The Owen made by a teenager in a 1940s home garage and left to rust at the side of his house in a 🥔 sack 😂
Mark most people don't fully understand the "art" of gun building, nicely stated. As a fellow gun nut and gun builder I totally get it. Also you touching on the subject of having a certain level of arrogance to do so is spot on!
That pistol grip got that gangsta lean
A what now?
Circa 1943.
@@Pommezul It's got like a 10 degree angle I'm not sure why it is that way. But whatever amuses him more I guess.😅
Fg-42 lookin grip
I was just thinking of another G-word
"These aren't the worst welds I've ever seen..."
I wanted to hear the rest of that sentence.
This lever will be very heavily stressed .. this is why the German ditched levers and went with rollers instead, because they can withstand much more force.
Downloaded immediately just in case youtube deletes video.
no ship
By point of reference on blowback bolt mass, Winchester used about 2 1/2 pounds on their straigh blowback model 1910. Ballistically, that's like a 10mm extra extra long so a bit hotter than modern 10mm but with the same bullet weight and basically the same case diameter. Even with that huge bolt mass, they have a stupidly high bolt velocity and eject brass into low earth orbit. Need crazy stiff magazine springs for the feed to keep up with the bolt or they jam horribly.
0:55 the Type 1 FG42‘s grip is angled so far because it puts your hand at the same angle as the grip on a Kar98K. That was actually a good idea since they would have been so used to that angle and it would‘ve been better for the soldiers issued the rifle.
That's such an odd concept because the gunner would be a specialist role like the submachine gunner would. You'd think they'd try to match it to say an MP40 grip instead
@ I believe the FG42 was originally meant to replace the Kar98K for Fallschirmjägers and eventually the entire Wehrmacht (Hitler loved the concept of the rifle) so I guess it kinda makes sense but what you said is probably why they switched the grip style for the second type.
Also, and probably mostly to prevent it from getting tangled in a chute
@ It isn‘t that because otherwise they wouldn‘t have changed the grip to be more vertical for the second pattern.
That FG42 grip angle absolutely makes it 🤌🏻
I like it, it's probably meant to mimic the grip angle of a traditionally stocked rifle from that era. (Total guess)
Lever-delayed, man.
I did a dynamic analysis to a rolled delay system a couple years ago using simulink. The way I understand this system is an inertia amplifier since the bolt carrier is forced to accelerate quicker (and has more mass). I think my theory is basically the same as yours since the force is the momentum differential. Great video Mark
1:02 The extreme angle on the FG-42 Typ B's grip was to reduce retraining of guys trained on the Kar98k.
+1 Wehrmacht muscle memory from Gew 98 and Karabiner 98k. The German personnel parachute systems tucked, the suspension lines joined into a single riser that attached to the harness near the center of the back, minimal contol or steering. no Fallschirmjaeger would be firing an FG42 during descent.
That handle design is deliberate, it means it can be fired from two positions, either shouldered like a normal rifle, OR also hanging lower on a shoulder strap, "fired from the hip" where the forearm is over the stock.
@@wizrom3046this is what I had heard, walking fire from the hip.
Changing doctrine and posture is REALLY HARD. Standing square to the target and presenting my plate coverage and tucking the elbow, holding the rifle up high almost off my collarbone takes thought. My muscle memory is still bladed stance elbow out 45 degrees. Changing my grip to a more vertical one has helped though.
@@adlerarmory8382
Especially since they used drop canisters for weapons and gear.
there is some novelty and ingenuity in this 'lever delayed" blowback idea. very cool design.
First derivative of acceleration is generally called "jerk." It is especially important in camming actions as you say.
Straight up jorkin it? The peanits?
If you try to find information on such systems you don't want so search "delayed blowback" but "retarded blowback" instead, because a shift in meaning happed over time. For example you will find those systems in Chinn's "The Machine Gun Vol. IV Design Analysis of Automatic Firing Mechanism" on page 54, while delayed blowback can be found at page 42.
It's not retarded, it's trying its best. :(
That’s the nickname I gave to my wife
@@strikeforce5331 😂
I think you should just finish this guys design with the accelerator lever. Put it in cad and make it a smooth arc if you decide thats what it needs.
Ive used the cad programs for drafting and designing that had the added wieght charts for spans and stress ect ect. Would give you all relevant fastener sizes and so on.
Used one similar for engine design.
Im sure there is one just for specific forces dealt with in firearms design.
Apparently Barry reinvented the German Korobov TKB-454 rifle from 1947 or the Famas from 1978 :)))
WG was where I first got bitten by the bug. Those guys were instrumental in helping me build some .... things. Making this into a gas operated rifle would be a very interesting thing to do. Although, that lever delayed is a pretty cool idea.
The system can be also explained by the so called French formula. Its "bolt head mass" + ("bolt carrier mass" squared "mechanical translation" ) = virtual mass
For the Famas it's 140g + ( 240g squared 3 ) equals 2300g
Meaning that that the Famas's real total bolt mass is only 380g, but due to its mechanical translation of 1:3 (for every millimeter of bolt head travel there are 3 millimeters of bolt carrier travel) the virtual mass of the Famas's bolt equal 2,3 kilograms.
FG-42 pistol grip was made that way to fit M98 Mauser drop crates. Fallschirmjager ( paratroopers) jumped with Browning pistol while their rifles were dropped in the crate. This was a disaster in Crete.
As mechanical advantage goes to infinity, deformation becomes significant leading to an over center mechanism. Hello Vise Grip action.
Bloke on the Range has a video about roller delay ("Roller Locking vs Delay: BotR Addendum") where he describes roller delay as a "down gearing system", re: "momentum amplifier".
I love the full on homebuilt just like that one. Complete it and show it firing.
Can't stop the signal!
They'll just regulate ALL firearm parts. Your whole crowd loves to push the envelope and poke the bear. The bear does have claws. Especially in this day and age.
Scuffed CoD WaW meta lookin ahh gun. I honestly love it, it looks like a ppsh and a greasegun squeezed out a welded baby. The angle on that grip makes me feel woozy. Also, 10mm lever delay? that thing is a train made of _recoil._ lolol.
for measuring the ratios, if you don't want a jigged setup - flat plate against the bolt face that extends past it (can likely do with while it's on its side with a gauge block). Micrometer as the moving device (against plate and lugs), for every X distance you close the mic, measure the gap that opens.
Somewhere I read that the Browning Auto-5, long recoil action, had a "recoil accelerator" a word combo I had never heard before. :) It was a spur cammed with the bolt so when the bolt was going back releasing the barrel to go forward, the spur would kick the bolt back further to guarantee the action spring behind the bolt had enough compression to push it forward.
Involute profile I think is what you'd want for the lever profile, just like a gear. That way the point of contact is always at the same radius from the pivot, and the pressure angle remains unchanged.
Wait, you're saying that someone else has surpassed my ineptitude for welding?
Quick go blind in one eye you can win this! :)
I think what you wanted to say is that the second derivative of the curve goes to zero on the flat spot
My vote is for lever delay
Or a non- linear curve. That would be the electronics engineering term. Discontinuance is something I’ve never heard of. Math is base for science and electronics. I enjoy working with smart talented folks that have different approaches to solve the same problem. Troubleshooting with the skills and materials you have. We benefit from this stuff, there are vehicles that run off of electric, gasoline and diesel fuel all sharing the road at the same time and have unique benefits. Thankyou for sharing these items. Another problem is a future one is that of manufacturing production. That also has weight to design and features.
Definitely need to do lever delayed
There are four main factors for the formula:
1. how long is the power leaver
2. how long is the working leaver
3. how steep is the surface the power leaver is pressed against
4. how steep is the surface the working leaver is pressed against
Those 4 questions has so be answered for every millimeter of movement. You will find out, the the "valley", were the lever in rested in the weapons housing, is most important because is controls the leavers movement. As soon as the leaver leaves this valley and its contact angle reaches a flat 90° the leaver no longer rotates and the acceleration of the bolt carrier stops.
Hi Mark, I always enjoy the relaxed nature of your show.
With pcc's becoming popular surely there's a market for delayed blowback guns that don't cost HK money
Lever delayed done correctly would be interesting.
Finding the shortcomings of the design then correcting that and make it work would be cool.
Gas operated would be interesting too.
First step would be to create a chart with measurements taken the following way. Fix the gun by its frame and stick a rod into the barrel a way were very fine adjustments could be made. I suggest something featuring a worm gear, like a second wise. Push the rod only 1 millimeter (or thousands of an inch) into the barrel. Then measure the distance the bolt carrier moved and the distance of the gap created between the bolt head and the carrier. Continue until this gap no longer increases in length. Then you can use the French formula, some one already posted, to know what exact "virtual" mass the bolt have at a specific moment. Those systems are nothing like simple blowback but with a rapidly changing in (virtual) mass.
Spoiler
This thing will most likely need a fluted chamber.
I would like to see a better lever delayed system but you are the one doing the deeds so have fun and geter done.
I'm far from a physicist but are you sure the total momentum's being increased? Wouldn't that require additional energy being put into the entire system somehow? From what I know of the lever delay system it seems like it just temporarily changes where the force is being applied within the bolt system itself. The total energy in the bolt is the same it's just that because the mechanism forces part of the bolt to hold still longer the mass that would normally be required to do that in a simple blowback is no longer required. Someone correct me here because again I'm not a physicist.
It’s cool. Idle hands are the devil’s workshop. The guys tinkering,thinking & working with what he’s got. & enjoys it. Theres nothing wrong with that. Like it.
Grip angle is for shooting off the hip.
Pretty cool.
I vote for the lever delay. Very unique and interesting.
I’d like to see lever delayed but whatever you want. Do you think the arc of the lever is too short? I’m one of the few that get excited about the math parts
Lever delayed would be so cool
I guess the grip angle on the first FG-42 was either thought to be more "streamlined" for use by parachute troops (less likely to snag on all the straps and gear you're wearing) or maybe it was supposed to resemble the classic rifle grip more as the paratroops were primarily issued Mauser rifles. Or both. Or I'm just completely wrong, idk.
Lever delayed is such qn underused and cool system i would love to see you give that a go. It seems to me it has the potential to be as good as roller delayed blowvack but without a lot of the tolerance requirements
that lever delay design is cool enough to see through at least once.
@10:10 Mark explaining that infinities are a sign your equations are _wrong._ 😂
I get the idea that lever delayed is grossly underutilized and underappreciated. It's finicky, but in its core incredibly simple and could lend itself to quite economical production.
Roller delayed rifles are notorious for their soft recoiling compared to gas operated rifles.
There aren't many samples for the lever delayed rifles besides the FAMAS, which happens to be incredibly stout I hear, but may have traded reliability for recoil.
And I think you can fit a lever delayed action in a handgun. In a parallel universe the alien pistol would be lever delayed
When you have luv and enjoyment of something just about anything is possible!
Cool chunk of metal!
Seems like the highest peak in stress on that accelerator lever should be at fully closed just after firing, and then have fallen off a fair bit by the time it hits that bump, so a smooth roll-off in leverage would be nice but shouldn't be the failure point. Then again, I haven't run the finite element analysis on it so maybe I'm just dumb and wrong.
Much better than the last one for sure thank you for sharing this enjoyable and informative video with us six stars brother
Please keep that genius delayed blow back design. If he changed the grip angle that reminds me of the german PSSH.
That is actually really cool for what it is. That grip actually looks CA legal the way it sits so far back lol doesn’t look like you can get the webbing of your hand under the receiver. Pretty interesting overall. Nice video.
There is no art to that thing. It is only pure function.
The technology to 3D print the majority of the firearm in metal is available now.
If you desired, you can 3D print Inconel exhaust manifold. That material and method would defiantly survive the firearm environment.
As a non-math person I am totally lost but still find it fascinating.
I use the Kentucky Ballistics Windage method. I also keep a thumb free just in case.
Since I’m in orlando , do you do shop tours ? I’ve got a serbu shorty mossberg 500 that could use a once over. Plus I’ve got an extra spot at Berns steakhouse if ya ever accepted my FB request lol
My guess on the FG42 grip angle was so it would be more compact to store in a box since German paratroopers from what I remember would be dropped with only a pistol and their primary weapon would be dropped in a crate that they’d have to retrieve. Then the switch to a more comfortable grip might’ve been because they realized they no longer had air superiority and airborne insertion was no longer possible so the whole compactness to fit in a crate was no longer necessary.
The original goal of delayed blowback was to minimize manufacturing costs, so how far down the rabbit hole does someone need to go to machine that H peice? My vote is to try his design, if you gas operate it, it would probably be easier to start with a whole new bolt
If I understand correctly, the acceleration profile of the back half of the bolt is defined by the curvature on that link piece acting against a flat on the back half of the bolt. Seems to me you could spreadsheet a set of curves that correlate to different acceleration profiles to find a balance between what’s possible with heat treatment and material choice for the link and bolt pieces vs the recoil spring capacity and spring constant, to keep the forces within the ranges that steels can handle without needing to go with tungsten or titanium or whatever.
A gas operated version might be easier to make work but it would be more complicated and less, uh, elegant as the mathematicians say.
Also, why are you so surprised that the gun was designed without CAD? Throughout the history of firearms, how many were designed without it? Most of them, of course.
Yup,I'm watching it again, this time on YT..
I think the lever delayed action is cool ,but which would give you the best cyclic rate ? Lever delay ?Gas delay ,or blowback? Or does it really matter as long as it's accurate?
It is a work of art.
Keep it up .
God Bless you and your loved ones
Cyclic rate is determined by a combination of many factors, and "best" is subjective based on how it is going to be used. If you want examples of very high rate of fire systems you could look at the AN-94 or G-11 rifles, or perhaps the M134a "minigun". Really the short answer to your second question is "No", and the long answer is "It depends..." followed by several pages of technical discussion.
Try the Luago approach; gas delayed blowback. On a larger platform like a pcc having some sort of active cooling is a little more reasonable. That way you can mitigate the overheating.
When you try to make a MAT 49 from memory and you're a few drinks in. Pretty neat though. Also, I believe the reason they had the weird grip angle on the first FG42 was because they wanted to maintain familiarity with the k98k, so the grip angle... kinda replicated the feel of holding a regular stock, I guess. Idk, I'm not German
The grip angle on the first FG42 was made at that angle to mimic the angle of the K98 and tto have less ability to catch something while on plane and in the parachute. The German parachute also had a single point attachmet so if someone tried shooting in the parachute they would start spinning, so that idea was quickly abandoned!
10 mm is by far my favourite caliber, not only because I'm European therefore metric lol. Only problem is the price
Where you from ? check in Germany, Czech Republic or Austria. Price are bonkers, really really low
10mm is so awesome!
France, it's really not that bad compared with rifle ammo like .308 (30 to 80-90€ for 20) but still, I get the JHP from PPU/Partizan at 34€/50 and the FMJ from Sellier& Bellot at 38€/50. Honestly it's only 68 cts/bullet but still if you shoot regularly it can become expensive compared to 9x19 from like GECO whose JHP sells at 10€/20
The only problem is the EU......
Bad news: it's 0.400 inches which is 10.2mm.
Gas operated pistol sounds incredibly interesting. That lever mechanism looks a little similar to the silencerco maxim 9 mechanism.
That thing looks cool. When i was a kid, id make model guns out of paper, i could definitely see myself making one of this.
Would be very interested in seeing the bolt more closely
Mathematica is really cool program, i used it to plot forces on hydraulic cylinders on tractor frontloader. As you said you need to know math, trigonometry exactly to do it. Enjoyed video as usual, thanks for posting.
Could you further lighten the bolt by adding a spring that stretches, connecting the front of the bolt to the rear of the bolt? That makes it even harder to open the bolt and maybe even helps prevent bounce back. Just thinking out loud.
Thank you for your time.
So, they guy who built it must have had a dream where an FG-42 and a Luty smg loved each other very much....pmsl!!
I guess I'll be the guy.
First model FG-42's have a grip to replicate the grip angle of a K98
The grip profile of the original FG-42 was designed to emulate the semi-pistol grip of the Mauser Karabiner 98k.
Watching now cause RUclips is ridiculous.
Thanks Mark!🎉😊❤
Lé Resistance needs this Barry guy.
momentum amplifier? like a lever?
Would be funny it you used a U Channel safety pence post for the barrel shroud and rudimentary sights but left the green coating on it.
People aren't born to do something, they learn what they love in life.
Grand Power, has a similar strange design. Its horizontal over the bolt carrier as a part of the charging handle. One part attached with the bolt accelerates with the moment of inertia, (firing) then the second part which was effectively stationary in terms of relative speed gets snagged and dragged along as well, slowing down the initial mass that was thrust rearward. Pretty spiffy 👍
I love this, been wanting to design a 10mm delayed blowback for years!
Lever delayed blowback was a favourite of Paul Kiraly who designed guns for 🇭🇺
I vote you go with your chat gpt idea to figure out the lever delay.
Gas blowbacks are a dime a dozen.
Why not make a roller delay for the recoil spring mechanism. Like the roller delay for an AR9. That would be cool. Use the lever and the roller delay and it will probably be smooth as silk. But another question. Was that thing semi auto? Or full. Be mint in full.
Would you want a lever delay system to be harder to push back at first, then get easier toward the end of "unlocking"?
Im no engineer , but in construction they are the guys who mess stuff up .but gas assisted seems much easier
They are never happy with the KISS method. Just like social scientists and deconstructionists.
If anyone doesn’t get to finish it, I watched it on rumble.
Sadly no access to rumble from France 😞
Rumble beats the RUclips bumble
Lever delayed! It would be harder to make work but mechanically elegant and interesting.
Can I send my wacky designs to Mark? 😂 I use CAD, probably not like a professional, but that’s the same story as my MiG welding!
Thanks for uploading, I always enjoy these types of videos! You’re awesome Mark!
That thing is metal as hell!!