It's called a "Bernoulli Pump" and we used them in the Navy to multiply the volume of water that our pumps could move, for about the same power. A stream of moving fluid (air being a fluid here) tends to draw surrounding fluid along with it. the air is compressed and pressurized by the plunger, pushing it against the primed dart, and the release is the air rebounding like a spring let free: equal and opposite reaction means the launcher and the dart air pushed away from each-other. upon release; the air is high pressure at the face of the plunger and the rear face of the forward dart, but it's motion in the middle is suddenly flipped to low pressure. (until equilibrium is reach based on the mass of the air, if your barrel were long enough and the system were sealed, you could stop the dart dead in the tube as the air is "stretched", until it's density (and thus, pressure) is too low: making a vacuum force where atmospheric pressure is pushing the dart into the blaster, rather than out.) (this flip commences from about the middle of the mass of the compressed air, and radiates outward rapidly) the low pressure of the moving air "sucks" (rather, the higher pressure of ambient air is pushing) the dart forward. If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air: the Bernoulli Effect would draw them forward into the moving stream of air. EDIT: spelling
"If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air" Sounds to me like Matt needs to look into a fully automatic nerf air-tank-powered blaster now!
So are you saying the plunger system is not necessary, and it can be replaced with a compressor or that the plunger system can have the air compressor feed darts as it recocks without pulling air ?
im loving all of these stupid simple solutions to things, like putting water on the dowels to make them expand. The blaster's design is also pretty awesome
Honestly, probably the best "build explanation" section I've seen out of any of the building channels I watch, because you went step by step on everything and explained how you did pretty much every little section, while most building channels tend to just cover the key points.
I think the key moment for the back dart is when the front dart exits the barrel. The higher pressure air is then connected to the outside atmosphere, which sucks it forward, which in turn propels the back dart as a temporary low pressure region is created behind the air wave escaping the barrel.
Gotta admit, the dart head as a dampener is pretty smart. Love your ideas, may not be good for quick firing, but they work and its goofy yet useable and reliable.
I was expecting the venturi effect, and we observed the venturi effect here... just not exactly how I imagined. Firing creates a low pressure zone in the chamber, which pulls the rear dart forward. Pressure differential isn't nearly enough to fire the dart all the way through, of course, as we see. Brilliant build, I love it.
It is not the venturi effect though. Venturi effect exists in a steady state flow, and the reduction in pressure from the venturi effect is only a reduction of pressure relative to the flow itself. When you have hundreds of psi pressure in an airgun you're not going to get a drop below atmospheric pressure (14.7 psi). Rather what we see is a pressure drop after the firing sequence because the air in the barrel had momentum and continued to travel out. Only a momentary pressure drop, a single pulse of low pressure, not a steady state process like venturi.
The dart moves forward because the air mass in the barrel has a ton of energy. When the main piston stops moving and the air mass in the tube wants to keep going, it creates a massive vacuum that sucks the dart into the barrel. This is legitimately how engine performance exhaust headers work to clear the combustion chamber of all spent gasses and allows the chamber to be under vacuum for the next intake cycle.
Holy cow, this channel's production quality has skyrocketed since I first subbed. Great to see the work you continue to put into making these projects!
Dude, I gotta say your fabrication techniques are really smart. By the 5 minute mark I had learned 3 new things for fabrication. Heve you ever thought of doing a series on fabrication?
I love not just how much planning you put into this, but also how you did everything properly. No "let's eyeball some markings for the drill and then yolo it" as I see so many other creators on youtube doing. I appreciate how much thought and diligence you put into this
The reason why the dart is pulled by the action is probably the same reason behind a "vacuum ejector", the movement of a higher pressure air passing through a channel can create a vacuum.
Cool video as always! I wonder if you've ever considered making a "shell" or "cover" for one of these completed projects to go around the components to give it that finished Nerf blaster look, just for fun.
You’re a very naughty youtuber, but the sheer quality of the video more than makes up for that. Seems pretty obvious why the 2nd dart gets pulled into the breech - the momentum of the air leaving the barrel causes a momentary vacuum which sucks it forward.
Dude you are such an awesome channel! It’s fascinating watching you build these and all the unique techniques you use, like just adding water to expand the wood, I’d have never thought of that.
The inertia of the air flowing out, after the first piece left the barrel, creates a bit of lower pressure at the end of a firing sequence which drags the second one in a bit.
Love this kind of content. I'm trying to remake my nerf collection after mom sold it (without my consent). I might just start building my own blasters!
this is cool. Seems like another variation of the "inline clip". Been using inline clips in most of my projects and this opens up many more awesome potential for this kinda ammo reloading.Thanks
I think its sucking the second dart forward, thats why it stops 'on a dime' over the air port. There's a small rebound of the plunger and a wave of air returning in the front of the barrel.
Your conception of mechanics is very intuitive and brilliant. I'm impressed. I'm an engineer/machinist and I would of done things slightly differently but that doesn't make your way wrong in any way. Well done. Very smart.
I have recently begun building my own homemades (following nerfhaven guides) and I am inspired by your precision and ingenuity. They make me want to bring another level of polish to my blasters :) keep up the great work!
Oh, that is so cool! My initial thoughts on how this might work led me to a different idea... -plunger pulls from front to back -Muzzle is capped with a moving cover -Pull a vacuum in front of the dart and put the pressure behind it -when the plunger bottoms out (or some threshold is hit) open the muzzle cover basically a combination pressure and vacuum cannon. Hmmmmmmm
Actually, you can defy physics, physics being the systems of math we use to predict how reality interacts with itself. Defying these predictions leads to new and better physics! But good luck doing that with a nerf blasters; usually it takes a Large Haldron Collider!
Gotta love when ppl describe shit with phrases like “this defies physics” followed by demonstrating and/or directly explaining the physics and why it’s functioning exactly as it should.
This is perfect for me to learn Some videos just don’t explain in a way where I understand enough to build my own functional version. And I looked EVERYWHERE and this was just randomly recommended to me. I am so happy! Nice video!
Dude, I'm so impressed by your techniques for making this blaster. The pen thing, centering the pipe, trigger mechanism, etc. I'm certainly no expert myself, so maybe I'm being impressed by some pretty basic stuff. But I feel like my mind has expanded from watching you work
Wow. These nerf blasters are getting better and better. You should try making a nerf blaster machine gun that can be set up on your car or something. Maybe even add a place where you can sit to control it by hand instead of remote control
Reducing the length of the barrel would let you know when friction is more powerful than the reduction of air pressure and you would notice this by the rear seal dart not moving forward. Or a stiffer spring moving faster might allow an even longer barrel, tunable again by not allowing the rear dart to nudge forward. Very awesome mechanical engineering and very awesome build ! Impressive!!!
To test if it’s a drop in air pressure in the barrel is what moves the dart forward, you could test using shorter barrels so that there is still pressurized air when the dart leaves the barrel.
Bernoulli's principle is probably drawing the second dart forward. You can check by loading just one dart and providing a constant stream of air through the barrel.
If what you said about the internal pressure being less than the external pressure (10:02), then you need to decrease the barrel length or increase the pressure to increase the bullet velocity. That suction force that pulls the rear dart forward is also slowing down the forward dart.
Could be a little bit of vacuum loading, too. Very cool concept. Surprised at it's power for being such a simple breach. I've been looking for a simple sniper lol
I think that effect is the same principle as fluid hammer ('water hammer') Though the net pressure never drops below atmosphere, gas movement has an inertia that creates a vacuum when the plunger suddenly stops. This similar in principle to the Venturi effect, though the configuration likely means it is not truly Venturi
The rear dart is moving forward because you are not dumping the same volume of air in to the barrel as the there is in the barrel when each darts are on opposite sides. This is creating a small vacuum right before the front dart leaves the barrel. Two options to fix this. One shorten the barrel or two make the compressed air chamber bigger.
Slick build! And I love how you're bringing so much innovation to pump action PVC blasters. This is some truly DaVinci stuff; breathing new life into the old arts. My theory for why the dart is pulled forward is a slightly off-tune barrel. I'm sure you calculated the plunger and barrel volumes, but I bet there's a bit of leakage when the blaster is fired, meaning there's not quite enough air to fill the barrel. So the momentum of the shot dart can pull the barrel pressure a bit low, sucking the second dart forward. I'll leave it up to you to see if this is a feature or a bug 😂
10:18 Its probably the exact same mechanism that is firing the other dart, IE the lower pressure maintained in the system after firing the other dart. It seems to pull it up to seal the hole and then stop. Originally, I thought you just sealed the chamber to the piston except for a tube the same size as, and routed to the hole in the back of the dart. The restricted diameter would create a system where you have a slightly lagged but high pressure nozzle. An additional pressure release that prevents the lag from prematurely firing.
All the ways you compensate for not having a milling machine are such good ideas. I learnt so many hacks for ghetto precision! I don’t have a milling machine so I wouldn’t know if it would play nice with that pipe.
Suggestion for magazine: barrel can instead be mounted on the underside of pressure tube, slide grip can slide around barrel as a guide, As the slide is racked, a rod can push a "seesaw" sort of mechanism that pushes another rod forward, That forward motion can be what pushes the next dart forward and out of the magazine into the breech, where another dart is already there and ready to be the next dart fired, With one pull you reset both the air and ammo for the next cycle, Whether this is useful for you or not, good luck! I'm sure you'll think of an awesome way to do it either way, this blaster is super neat 😁👍
Oh! I just had an idea, you could print a rack and pinion gear where two racks interface with one pinion gear, that outta do the whole "backwards motion turned into a forward motion" thing super efficiently, you got this!
It’s over pressure. As the other dart is being blown through, there is still an air gap behind it, which is likely drawing the other dart through, until the first dart exits.
This is gonna go so good with my H2 hand blaster i have been dying to figure out a loading mechanism that doesn't need to cycle with recoil. but have been facing issues with sealing the breach. Now THIS solves everything. Thanks mate this gonna help a lot.❤
simplest explanation i can think of: fast air has lower pressure so once that pressurized air expands and accelerates it actually drops below outside pressure and the second dart moves forward from the pressure difference
My first thought about the second dark moving forward is that it probably has something to do with Bernoulli's principle and as the first start gets farther away the air pressure probably drags the second dart forward a bit
9:55 the awnser to your confusion is suction and yes there is suction created while blowing in a 3 way tube even if it only goes one direction it will create suction on the 3rd hole that was an old old way to create a vacuum
Air pressure in the barrel after the first dart leaves is lower than atmospheric. After the dart leaves the barrel, the air is still at some pressure above atmospheric and exits the barrel. But all of the air in the barrel has some momentum moving towards the end of the barrel, just like an engine exhaust or shock tube air tunnel. As that air keeps moving forward, the pressure at the back of the barrel drops below atmospheric and allows the atm pressure to start pushing the second dart in. But, since air is compressable, the moving air slows down and reverses direction and sends a series of shock and expansion waves up and down the barrel until atm pressure is achieved, which stops the second dart before it gets too far into the barrel.
There are a lot of people saying the Venturi effect. However I don’t believe this is true. Because the air is not flowing through unobstructed, it’s pushing dart number 1. I believe this is a result of the “pressurized” air rushing out of the barrel after dart number 1 is free. The air rushes out with such velocity that it creates a vacuum in the barrel. Because the air in the barrel has forward momentum. It’s easier for atmospheric pressure to push dart 2 inward just a bit, instead of push back against the moving air. I would LOVE to see this blaster fire with a little slow-mo. And maybe a clear resin dart loader if possible!
So it's an RSCB like the community used to make like 15 years ago, but with much better production value. Neat. It's definitely air pressure pulling the next dart in the "clip" (very short tube magazine) forward.
No subscription for clickbating losers!!!
Agreed
lol why was this pinned xD
@@I.PAddress pin of shame
It's called a "Bernoulli Pump" and we used them in the Navy to multiply the volume of water that our pumps could move, for about the same power. A stream of moving fluid (air being a fluid here) tends to draw surrounding fluid along with it.
the air is compressed and pressurized by the plunger, pushing it against the primed dart, and the release is the air rebounding like a spring let free: equal and opposite reaction means the launcher and the dart air pushed away from each-other.
upon release; the air is high pressure at the face of the plunger and the rear face of the forward dart, but it's motion in the middle is suddenly flipped to low pressure. (until equilibrium is reach based on the mass of the air, if your barrel were long enough and the system were sealed, you could stop the dart dead in the tube as the air is "stretched", until it's density (and thus, pressure) is too low: making a vacuum force where atmospheric pressure is pushing the dart into the blaster, rather than out.)
(this flip commences from about the middle of the mass of the compressed air, and radiates outward rapidly)
the low pressure of the moving air "sucks" (rather, the higher pressure of ambient air is pushing) the dart forward.
If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air: the Bernoulli Effect would draw them forward into the moving stream of air.
EDIT: spelling
"If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air"
Sounds to me like Matt needs to look into a fully automatic nerf air-tank-powered blaster now!
So are you saying the plunger system is not necessary, and it can be replaced with a compressor or that the plunger system can have the air compressor feed darts as it recocks without pulling air ?
That's probably what's going on here. It somewhat reminded me of barrel evacuators on tanks and how they pull the smoke out of the barrel.
@@kilotheneko2064yes, you know some odd vacuums are made this way.
sounds to me like a mouth powered atomiser ( www.google.com/search?q=mouth+atomiser )
im loving all of these stupid simple solutions to things, like putting water on the dowels to make them expand. The blaster's design is also pretty awesome
e x p a n d
Bigmode@@matt_yuan
That's so brilliant.
that pen holder from the beginning is very clever!
ty!
His entire way of machining is genius
To be fair I wouldn't be surprised if Matt could find a way to defy physics
Because he can.
Genius, not because of the blaster design but how smart you were manufacturing it
Honestly, probably the best "build explanation" section I've seen out of any of the building channels I watch, because you went step by step on everything and explained how you did pretty much every little section, while most building channels tend to just cover the key points.
That drill press balance is such a good idea
Matt, your production quality has actually gotten that of a professional.
tyty
Your English has actually gotten that of an amateur
The dart is so excited for it's turn to get launched, that it wiggles forward into the barrel.
I think the key moment for the back dart is when the front dart exits the barrel.
The higher pressure air is then connected to the outside atmosphere, which sucks it forward, which in turn propels the back dart as a temporary low pressure region is created behind the air wave escaping the barrel.
0:40 my guess is how vaccums work
Welp it was simpler than expected.
o7 rip sacraficial dowels
they will not be forgotten
@@matt_yuan type F in the chat
F
F
F
Gotta admit, the dart head as a dampener is pretty smart. Love your ideas, may not be good for quick firing, but they work and its goofy yet useable and reliable.
I love how this channel grew from simply modding a long shot and now defying physics itself
Your resourcefulness and clever tricks are a treat to watch and make you more defined from other channels
Very clever ideas in this project, but the production value of the video is what really impressed me. You've put a lot into this video and it shows!
I was expecting the venturi effect, and we observed the venturi effect here... just not exactly how I imagined.
Firing creates a low pressure zone in the chamber, which pulls the rear dart forward. Pressure differential isn't nearly enough to fire the dart all the way through, of course, as we see.
Brilliant build, I love it.
It is not the venturi effect though. Venturi effect exists in a steady state flow, and the reduction in pressure from the venturi effect is only a reduction of pressure relative to the flow itself. When you have hundreds of psi pressure in an airgun you're not going to get a drop below atmospheric pressure (14.7 psi). Rather what we see is a pressure drop after the firing sequence because the air in the barrel had momentum and continued to travel out. Only a momentary pressure drop, a single pulse of low pressure, not a steady state process like venturi.
I have a suggestion for the next blaster. Try and design, a ww1 era, open-bolt rifle, fed by clips ofc, really wanna see your take on that
The dart moves forward because the air mass in the barrel has a ton of energy. When the main piston stops moving and the air mass in the tube wants to keep going, it creates a massive vacuum that sucks the dart into the barrel. This is legitimately how engine performance exhaust headers work to clear the combustion chamber of all spent gasses and allows the chamber to be under vacuum for the next intake cycle.
Yep. Great explanation, man. It’s all down to momentum.
Holy cow, this channel's production quality has skyrocketed since I first subbed. Great to see the work you continue to put into making these projects!
Dude, I gotta say your fabrication techniques are really smart. By the 5 minute mark I had learned 3 new things for fabrication. Heve you ever thought of doing a series on fabrication?
Everything about this build is clever and shows your skill as a designer ‘and’ craftsman. Well done!
Have you ever brought your builds to a game? Would be cool to see it used in action as well. But the build process is awesome keep up the great work.
nope
@@matt_yuan 😥
@@matt_yuan You really should, all of your stuff is very cool and reminds me of old Nerf homemades
I love not just how much planning you put into this, but also how you did everything properly. No "let's eyeball some markings for the drill and then yolo it" as I see so many other creators on youtube doing. I appreciate how much thought and diligence you put into this
The reason why the dart is pulled by the action is probably the same reason behind a "vacuum ejector", the movement of a higher pressure air passing through a channel can create a vacuum.
I’ve been here since your first video. You’ve come a long way.
2:00 im pretty sure a normal ruler would have worked too.
Cool video as always! I wonder if you've ever considered making a "shell" or "cover" for one of these completed projects to go around the components to give it that finished Nerf blaster look, just for fun.
i like the unfinished look
@@matt_yuan If that's your preference no worries, was just curious if it had ever crossed your mind. Appreciate the reply!
Nice work as always! Thanks for the useful techniques to accomplish that precise slot on the cylinder.
You’re a very naughty youtuber, but the sheer quality of the video more than makes up for that.
Seems pretty obvious why the 2nd dart gets pulled into the breech - the momentum of the air leaving the barrel causes a momentary vacuum which sucks it forward.
Dude you are such an awesome channel! It’s fascinating watching you build these and all the unique techniques you use, like just adding water to expand the wood, I’d have never thought of that.
mate bloody good job, amazing work
Modern day RSCB
Exactly what I was thinking... late 2000s design, but with much better production value than the old homemades.
Love all the creative solutions to make do with what you got!
hey, your editing is getting pretty good. I'm really looking forward to seeing you improve even further.
The inertia of the air flowing out, after the first piece left the barrel, creates a bit of lower pressure at the end of a firing sequence which drags the second one in a bit.
Almost right but air can't drag anything, it can only push.
I met you and open sauce and shot the blaster you had there. it was super cool! thanks for letting me try :)
Love this kind of content. I'm trying to remake my nerf collection after mom sold it (without my consent). I might just start building my own blasters!
this is cool. Seems like another variation of the "inline clip". Been using inline clips in most of my projects and this opens up many more awesome potential for this kinda ammo reloading.Thanks
There are so many smart build tips for working with tubes! Great video!
I had this really cool science teacher in 6th grade and he help made me fall in love with science and you remind me of him
I think its sucking the second dart forward, thats why it stops 'on a dime' over the air port. There's a small rebound of the plunger and a wave of air returning in the front of the barrel.
I'm with you on this. I'd be curious to see what happens when a shot is taken with the back retaining piece held out of the way.
The pen-holding technique garnered my subscription. I can't wait to share it (and your channel) with our maker co-op folks!
I automatically knew it uses vacuum pressure basically
The way it works is great, but those practical tricks you used when actually making it earned my subscription.
MAKE A MAGAZINE FOR THIS 🗣️🗣️🗣️🗣️🗣️🔥🔥🔥🔥🔥🔥🔥
im probably making this overly complicated but fitting a aloff’s device to the blaster and linking it to the pump handle would be awesome
Your conception of mechanics is very intuitive and brilliant. I'm impressed. I'm an engineer/machinist and I would of done things slightly differently but that doesn't make your way wrong in any way. Well done. Very smart.
thanks!
I have recently begun building my own homemades (following nerfhaven guides) and I am inspired by your precision and ingenuity. They make me want to bring another level of polish to my blasters :) keep up the great work!
Who are you, who are so wise in the ways of science?
Oh, that is so cool! My initial thoughts on how this might work led me to a different idea...
-plunger pulls from front to back
-Muzzle is capped with a moving cover
-Pull a vacuum in front of the dart and put the pressure behind it
-when the plunger bottoms out (or some threshold is hit) open the muzzle cover
basically a combination pressure and vacuum cannon. Hmmmmmmm
I'm in love with your builds. You should build nerf blasters for NASA.
You’re the hero we don’t deserve my friend. Seeing you continue to develop traditional nerf modding give me the warm fuzzies
Nice clickbait title- you cannot defy physics. *Rings a bell* SHAME! *repeats forever*
More like "defies your intuition of physics"; would be clickbaity enough while not being a false statement in lots of cases
Oh you can defy physics, it just never works out.
It's not really clickbait, because everyone understands that...
More like...... eh.....idk
Actually, you can defy physics, physics being the systems of math we use to predict how reality interacts with itself. Defying these predictions leads to new and better physics!
But good luck doing that with a nerf blasters; usually it takes a Large Haldron Collider!
Wake up there’s a new Matt yuan video
Gotta love when ppl describe shit with phrases like “this defies physics” followed by demonstrating and/or directly explaining the physics and why it’s functioning exactly as it should.
Venturi. At least that is my first thought.
This is perfect for me to learn
Some videos just don’t explain in a way where I understand enough to build my own functional version.
And I looked EVERYWHERE and this was just randomly recommended to me.
I am so happy!
Nice video!
Dude, I'm so impressed by your techniques for making this blaster. The pen thing, centering the pipe, trigger mechanism, etc. I'm certainly no expert myself, so maybe I'm being impressed by some pretty basic stuff. But I feel like my mind has expanded from watching you work
i love the trigger spring. using a nerf dart tip is so smart but simple, and yet, very few would have thought of that.
You are doing homemade designers proud! Build on!
skewers r cool
Wow. These nerf blasters are getting better and better. You should try making a nerf blaster machine gun that can be set up on your car or something. Maybe even add a place where you can sit to control it by hand instead of remote control
What I like most about this kind of videos are the solutions that are given to problems in ways I'd never imagine!
It's interesting to note that nothing can "defy physics." Anything that appears to is only illustrating something we may not have known already.
Reducing the length of the barrel would let you know when friction is more powerful than the reduction of air pressure and you would notice this by the rear seal dart not moving forward. Or a stiffer spring moving faster might allow an even longer barrel, tunable again by not allowing the rear dart to nudge forward. Very awesome mechanical engineering and very awesome build ! Impressive!!!
New Matt Yuan video? Ok!
Nice work!
The first dart doesn't have enough volume of air pushing it, so the first dart creates a tiny vacuum and pulls dart 2 forward.
these are some excellent blaster videos, keep it up :3
Man the engineering genius that went into designing this thing is insane and it deserves some respect and recognition 😊
To test if it’s a drop in air pressure in the barrel is what moves the dart forward, you could test using shorter barrels so that there is still pressurized air when the dart leaves the barrel.
Bernoulli's principle is probably drawing the second dart forward. You can check by loading just one dart and providing a constant stream of air through the barrel.
I'd love to build some of your designs to add to my homemade collection. Awesome work!!!
If what you said about the internal pressure being less than the external pressure (10:02), then you need to decrease the barrel length or increase the pressure to increase the bullet velocity. That suction force that pulls the rear dart forward is also slowing down the forward dart.
Could be a little bit of vacuum loading, too. Very cool concept. Surprised at it's power for being such a simple breach. I've been looking for a simple sniper lol
I think that effect is the same principle as fluid hammer ('water hammer')
Though the net pressure never drops below atmosphere, gas movement has an inertia that creates a vacuum when the plunger suddenly stops.
This similar in principle to the Venturi effect, though the configuration likely means it is not truly Venturi
The rear dart is moving forward because you are not dumping the same volume of air in to the barrel as the there is in the barrel when each darts are on opposite sides. This is creating a small vacuum right before the front dart leaves the barrel. Two options to fix this. One shorten the barrel or two make the compressed air chamber bigger.
Slick build! And I love how you're bringing so much innovation to pump action PVC blasters. This is some truly DaVinci stuff; breathing new life into the old arts.
My theory for why the dart is pulled forward is a slightly off-tune barrel. I'm sure you calculated the plunger and barrel volumes, but I bet there's a bit of leakage when the blaster is fired, meaning there's not quite enough air to fill the barrel. So the momentum of the shot dart can pull the barrel pressure a bit low, sucking the second dart forward.
I'll leave it up to you to see if this is a feature or a bug 😂
Oh my goodness I get to see a Matt yuan video less than an hour after he posted
Some of these tips are gold!, centering the drill on a curved surface, watering the dowels, this is all genuis stuff!
The venturi effect would be a pretty solid explaination i think !
Using dowels to support the drill bit was genius and I wish I knew that sooner
10:18 Its probably the exact same mechanism that is firing the other dart, IE the lower pressure maintained in the system after firing the other dart. It seems to pull it up to seal the hole and then stop.
Originally, I thought you just sealed the chamber to the piston except for a tube the same size as, and routed to the hole in the back of the dart. The restricted diameter would create a system where you have a slightly lagged but high pressure nozzle. An additional pressure release that prevents the lag from prematurely firing.
All the ways you compensate for not having a milling machine are such good ideas. I learnt so many hacks for ghetto precision! I don’t have a milling machine so I wouldn’t know if it would play nice with that pipe.
The mechanical design and color's trigger something nostalgic for me
Nice, this was a great redesign to make it capable of automatically reloading!
Thoughly impressed at the build quality. Some very clever build methods. And great attention to detail. You are very skilled
Suggestion for magazine:
barrel can instead be mounted on the underside of pressure tube,
slide grip can slide around barrel as a guide,
As the slide is racked, a rod can push a "seesaw" sort of mechanism that pushes another rod forward,
That forward motion can be what pushes the next dart forward and out of the magazine into the breech,
where another dart is already there and ready to be the next dart fired,
With one pull you reset both the air and ammo for the next cycle,
Whether this is useful for you or not, good luck! I'm sure you'll think of an awesome way to do it either way, this blaster is super neat 😁👍
Oh! I just had an idea, you could print a rack and pinion gear where two racks interface with one pinion gear, that outta do the whole "backwards motion turned into a forward motion" thing super efficiently, you got this!
That's some incredibly clean work there. Love it!
It’s over pressure. As the other dart is being blown through, there is still an air gap behind it, which is likely drawing the other dart through, until the first dart exits.
This is gonna go so good with my H2 hand blaster i have been dying to figure out a loading mechanism that doesn't need to cycle with recoil. but have been facing issues with sealing the breach. Now THIS solves everything. Thanks mate this gonna help a lot.❤
simplest explanation i can think of: fast air has lower pressure so once that pressurized air expands and accelerates it actually drops below outside pressure and the second dart moves forward from the pressure difference
My first thought about the second dark moving forward is that it probably has something to do with Bernoulli's principle and as the first start gets farther away the air pressure probably drags the second dart forward a bit
9:55 the awnser to your confusion is suction and yes there is suction created while blowing in a 3 way tube even if it only goes one direction it will create suction on the 3rd hole that was an old old way to create a vacuum
Air pressure in the barrel after the first dart leaves is lower than atmospheric. After the dart leaves the barrel, the air is still at some pressure above atmospheric and exits the barrel. But all of the air in the barrel has some momentum moving towards the end of the barrel, just like an engine exhaust or shock tube air tunnel. As that air keeps moving forward, the pressure at the back of the barrel drops below atmospheric and allows the atm pressure to start pushing the second dart in. But, since air is compressable, the moving air slows down and reverses direction and sends a series of shock and expansion waves up and down the barrel until atm pressure is achieved, which stops the second dart before it gets too far into the barrel.
I wonder if this will work with an XBZ as the air source?
There are a lot of people saying the Venturi effect. However I don’t believe this is true. Because the air is not flowing through unobstructed, it’s pushing dart number 1. I believe this is a result of the “pressurized” air rushing out of the barrel after dart number 1 is free. The air rushes out with such velocity that it creates a vacuum in the barrel. Because the air in the barrel has forward momentum. It’s easier for atmospheric pressure to push dart 2 inward just a bit, instead of push back against the moving air. I would LOVE to see this blaster fire with a little slow-mo. And maybe a clear resin dart loader if possible!
i have tried 240fps slomo but that’s not enough frames unfortunately
I'd say the reason why the next dart is brought forward is due to the Venturi effect
Not the Venturi effect, it’s actually another application of Bernoullis principle, so pretty close.
The charge of air leaving the barrel has inertia, so it will draw a vacuum as it exits.
One of my favorite channels!
So it's an RSCB like the community used to make like 15 years ago, but with much better production value. Neat. It's definitely air pressure pulling the next dart in the "clip" (very short tube magazine) forward.