Bullets vs Propeller in Slow Motion - The Slow Mo Guys
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- Опубликовано: 20 ноя 2016
- Gav and Dan venture out to the desert to film some bullets. Make sure you watch in HD for maximum bullet shockwave action!
Cheers to EA for sponsoring this video. Check out the game at www.battlefield.com
Follow Gav on Twitter - / gavinfree
Follow Dan on Twitter - / danielgruchy
2nd Channel! / @theslowmoguys2
Thanks to:
Destin from Smarter Every Day for lending us the camera - / destinws2
Bullets vs Propeller in Slow Motion - The Slow Mo Guys
Filmed with the Phantom v2511 between 28,500fps and 120,000fps
And the Phantom Flex 4K at 1000fps 
Развлечения
fun slo-mo fact, those bullets are traveling about 2800 fps. The twist rate on an m60 is 1 in 12 inches. So that means the bullet is spinning at 2800 revolutions per second, or 168,000 RPM
Casey Ellis that's awesome
i like pizza
Casey Ellis spins faster than a jet engine, crazy!
Really?! That's immens! Didn't know bullet spin so fast! Is that normal?
Casey Ellis damn
Can you do a slomo of two guns pointed at each other (or at a slight angle) and watch in slomo the two bullets colliding to each other?
Candi Soda whose gonna pull the trigger two people wouldnt do that its two risky
and the angle to get the bullets to collide would be way to difficult to find as well
marcus james not impossible tho, and a person isn't required to fire a gun
Laser sights and remote triggers have existed for quite a long time. That's generally how companies will test firearms before releasing them for public use.
Altai how would it fire
"Nothing here, nothing going on"
Blue car casualy driving by 1:03
Dang
"Da fuq day doin' over der?
Truck*
Craft services
Isn't that the thanos truck
Imagine the sync gear being just a *little* off, and it ends up only shooting when the propeller is right in front of the gun.
But, wouldn’t only shot the propeller in the same place?
@@iedi3 Yeah, but that would still be enough to destroy the propeller.
@@iedi3 If’s the synch gear can jump once, it can do it again much more easily
they show it in the video what happens.
This happened a few times. The one I can recall is the synchro on the israeli S-199, which was basically a german bf109 with a german bomber engine
"What do you like most about World War 1?" - solid question mate
It's over
Just everything in general. I really enjoy history
Aviation
Red baron
"That I wasn't there...."
This is the stuff that needs to end up on the trending page.
JerryRigEverything definitely! In my country all trending videos are crappy vlogs.
Eternal Genesis true
JerryRigEverything yeah
Omg Zack you here?! :D
Arek R. Always ;-)
i love how they say there is no one around then atruck roles past them
I was just gonna type that
I just read that as a truck roll past them
/summon real_world:truck ~-10 ~ ~
The truck is actually theirs, delivering supplies to their secret base to build their slow motion army to take over the world. Might take a while though
I read this comment aaaaaand then the truck rolled by. You wizard
Dan: was in the military
Also Dan: thinks it’s a good idea to touch the barrel of the gun
Not the actual barrell its a fake heatsink to make it look more like vickers mg pay attention to what they say smh
@@m.j.a7704 yeah a heatsink that has barrel heat and is standard knowledge of no touch can be hot
@@pyrocryptic29 dude its based on m60 it used vickers heat sink but when you think about it the barrel size and fit is different the vickers heatsink is not even touching m60 barrel is there only for the aesthetics
M. J. A you ever heard of this thing called thermal conduction? Metal does it, it’s where heat disperses through an object, and good conductors like metal disperse the heat very easily allowing them to heat up very quickly, the fake jacket is in contact with the barrel so it heats up just the same, and because the heat sink is fake it carries no water so has no actual cooling factor. It’s just like him touching the barrel unjacketed, learn basic physics cat shagger
Ah, must've been army. I never saw him eat crayons so he wasn't a marine.
Sponsored by EA? I'm surprised we didn't have to buy the second half of the video as DLC.
Nah thats activision
Or the video isn't what was promised and then they call us all entitled cry babies.
gottem
you can buy packs that wouldve changed the color of the gun...
Play of the game goes to spiff2268
Now bullets vs bulletproof glass
Tuned Gaming that actually sounds interesting, seeing how the glass would warp or move, and how much material would spiderweb.
better, bullets through one way bulletproof glass
Great idea! :-)
omg yes
Tuned Gaming YES YES YES YES
Gav - Hello there, I'm Gav
Dan - I'm done
Then he leaves and never come back
(Sad music plays)
@@mikaeluhl adiòs
@@peecizabesuto bonjour
if the prop was spinning faster it would have pulled the machine over
"There's no one here"
**car drives past**
whats happening, the slow mo guys are churning out the videos, its great
When sponsorships happen in a good way.. it's awesome, like this.
Yeah
Did it, still shrunk :(
therealnightwriter that is so mean
therealnightwriter
Plot twist: he's 38..
Ahhh I love guns. I really really do.
Mr. President, whether you like it or not ayyyy lmao
Clayton Robinson, Wow, you're original and funny. You deserve a cookie.
Mr. President, whether you like it or not Guns are like giant toys that can kill some one.
I LOVE YOU Guns are NOT toys! They are instruments of self preservation. Nothing more than a tool, the person wielding the gun is the weapon!
Hillary wants to ban them, but wants a personal nuke for everybody
How much did you have to pay to get sponsored by EA?
hahhhaahah
wow It's upside down
I dont think you understand how it works my friend
@@alexsubhatu2355 how did you manage to not get the sarcasm ?
They paid with their soul of course! That is how these transactions works you know. 🤫
1:04 "In the middle of nowhere"
Zsombor Kis Lmaooo
Also 6:27
LOL
Before the Dutch invented synchronisation gear for the Germans, the French just stuck metal on the propellors as armour. So the French pilots were shooting at their own propellors and hoping they didn't blow them off.
And in WWII, an American pilot got a bullet right through the centre of his propellor blade, but managed to return to base. If it had been just a bit to the left, or a bit to the right, he would've gone down.
Cybermat47 the British decided to make a pusher aircraft which was actually fairly decent. They also made some sort of monstrosity with the gunner sitting in front of the propellor on a gondola (or 'pulpit') with the pilot sitting on the other side, that was less successful for obvious reasons,
Cybermat47 edit the decent pusher design was the DH. 2 it won airsuperiority over the Somme. the bad one with the gunner risk of losing limbs in propellers was the Be 9
I've seen the picture you're talking about, scary stuff! It was a P-47 that took flak (if i remember correctly) directly to the prop. Massive hole left in one of the blades big enough to stick your arm through.
I heard the metal plates would sometimes cause the bullets to ricochet back at the pilot resulting in death or injury.
Cybermat47 If I recall correctly, it was the Germans who invented this technology.
Who thinks that they are the best at slow motion???!
8,642,900+ people think so.
Rakim Roien well I mean they did film the slow motion for the film hot fuzz so everyone
I am one of those people.
Rakim Roien the cameras are
iPissOnStuff. ok...
2:04 when you hear a teacher coming.
BRUH
The experience is idiotic. The propeller never turns so slowly. At high speed, the holes can be completely different, up to the blade tip.
4:17 I would not be standing in front of that gun at any time loaded or not.
Even if it’s not loaded I’d still be scared to go anywhere near to the front of that thing
Exactly
Is he? He's standing on the far side of the propeller while it's more or less straight up and down and the gun should be centered on the propeller. His left elbow is against the far side of the fuselage. If his head is in front of the gun, that would mean his right elbow must be straight in front of Dan relative to the engine which doesn't seem to be supported by the rest of his positioning. I won't deny that it looks like his head is lined up with the gun but I think that's a perception issue....
Why? It would be interesting to stare straight through to the barrel of an m16
They are ALWAYS loaded
In the middle of nowhere, no ones around - car drives past
Daniel Smith I read this and it happened about a second later
Ronin Harper SAAME!! WTF
Same
They would make great yahoos!!
I didn't see it
If you haven't done it already, can you have a slow-mo firework explosion underwater?
that would be cool
Legionare Guy uhhh
Uhhh..
Legionare Guy uhhh
Ehhh
"Absolutely nothing here" while a car drives by in 1:03
Hi! We've just open a youtube slow motion channel and, if you want, you can have a look to our channel
ruclips.net/video/ZVoTzTrmoGM/видео.html
These filming aspects are absolutely magnificent.
"No one is out here"
Truck drives in the background
*Busted*
they have a crew you Muppet..
@@rickeyryan303 its a joke jezz
Is there any slower resolution? Could you get 1,000,000 fps on a phantom?
Hassan With 20x13???
You couldn't see anything cuz the resolution ;D
You need government permission to use 1,000,00
*1,000,000
Philipp Walder sorry I don't understand this stuff. Is there anything slower than 120,000 fps that you could get?
Hassan Yeah there's a camera out (NOT commercial) that can see the light in motion. Search after "1.000.000.000.000fps" on RUclips
This was great guys. I've always wondered how this worked. Thank you
2:07 when you skipped class and a security is walking your direction.
99% of the people wont see this, but if you are that 1% have a nice day/night 😉😀
10k without a video? Thanks! You too
It's probably less than 1%, unless this gets top comment or something.
10k without a video? +
99% of the people wont see this but, fuck off
or maybe 99% DOES see this, cause it's top comment
Gavin! Don't stand down range of a gun mann
Because im, BATMAN! it was making me a little nervous to!
Because im, BATMAN! Good call, pretty unsafe. I love this channel, but that made me a little nervous. Not an anti gun lefty, btw.
Gun was out of ammo, and it was declared range safe. No danger. He's not standing in front of a loaded gun.
Rage safe is a great way to describe it, tbh.
pretty sure he's been on set with explosives and guns already, he's young but has experience with filming and gun procedures I imagine
I really enjoyed this video. You crazy slo-mo guys did a great job! Thanks for sharing...
Subscribed to this one.
I really love how they dressed up an old M60 to look like an old Vickers machine gun. I applaud the effort.
Edit: whelp, Dan confirms it.
If this is on trending and this video is sponsored
EA is very lucky
C.S. D EA can suck a dick
XC CX i just said there lucky is there a problem with that
"lucky".. Your innocence is adorable :P
They're in the desert so this isn't dangerous *car drives passed in the background* um...
so what?
I think "in the background" is an important part of that. It's being in the line of fire that's the dangerous bit.
+Völundr Frey i guess, it's just weird they came all the way out to the desert then set up right next to a road.
JhericFury Its a shooting range, not the middle of the desert.
+crashandburnbirner i mean, i guess it'd be both, but okay, sure, that works
Thanks for the video guys! I had just done a bunch of research on the different syncro devices used during WWI. It was quite interesting, as you guys just briefly touched on it, the airplane engine is constantly changing speeds which the synchronization mechanism had to take into account.
Loved seeing the Vickers machine gun! Great job as always!👍
2:08 me when my brother told me to leave his special suit case in principles office and run away
I wonder if the reason the bullets come out so close to the leading edge is so that they will be less affected by turbulent air caused by the propeller blades.
Tom Haflinger ah, smart. I was thinking it should be after the blade to reduce the risk of impact, but that makes sense.
Total guess, though. They said they slowed the propeller down. I wonder if it works out differently when the blades are moving faster.
Tom Haflinger if you guys find out for sure mind sending the link? Great minds guys
A cursory search for "synchronization gear" and "turbulence" doesn't turn anything up, so it could be a coincidence.
If the gear can be adjusted, experimentation could shed some light on this, seeing if firing earlier or later affects the accuracy.
The one tricky thing, though, is that the mock engine is stationary. The propellers are without a doubt creating turbulence, but relative to the bullet trajectory, is that turbulence comparable to what might be encountered in real flight?
Really the gun can go off at any time between the blades. it's about the speed of the machine gun not the propeller. It's basically a small cam that disables the gun while the prop is right in front. Other than that you can pull the trigger and fire away in the middle, the tail edge or leading edge, doesn't matter.
You guys should do slowmo goosebumps!!
This needs more likes
This is a great idea!
spooky
would't it need to go faster as it's a slow process not a quick one
cfg_Forumic OMG YES!!
Them: "guns and slomo go great together"
Me: "so why no demolition ranch"
Used to be great
still is
Awesome video as always guys. Keep it up!
6:14 - It's called a heat sink for a reason...LOL
"Well, we couldn't get one of those, so we turned an M-60 upside down..."
I died. XD
Sick!! Loving all the angles.
Great video guys. If only we had this sort of video to refer to in history when I was at school.
EA really needs advertising...
no it doesnt
what?
Dai_Veed ever heard of sarcasm?
*companies really like advertising*
"whats that? noones playing the new cod this year? guess EA did better... so no.. activision needs new advertising.
One of the early French pilots I believe just fixed a gun firing through his propeller arc and just reinforced his props with metal. Bullets that hit were deflected. For a time it was successful. The problem was that the stupid bastard didn't replace the propeller after each mission and eventually it broke in mid flight and he was killed in the resulting crash. Literally shot himself down.
I remember reading that also. It made a huge difference in the hit/kill ratio.
Correct. Note: It was Fokker who invented the "Interrupter gear" for the Germans. Probably the Allies discovered it while poking through some wreckage. Or it was parallel development.
adavidmundt You mean synchronization gear. It didn't prevent the gun from firing, it actually fired the gun itself.
No, the Synchronization gear was someone else (and works as you describe) - the interrupter gear was invented by Fokker, it was just a much worse concept than the synch gear
Panzerkampfwagen
He was called Roland Garros. He was NOT killed after he downed his plane due to completely unrelated reasons. His plane was actually captured and studied by Anthony Fokker who tried to improve this system. He became a P.O.W. throughout most of the war but escaped. He wasn't stupid either.
Awesome vid. Btw Gav, just saw your movies, I thought they were really awesome! Big fan. I'd love to see you do more acting. Your American recheck accent is brilliant😂😂
Good job as always guys!
couple questions....
1. Shouldn't the prop be going faster?
2. If your gun is synced to your propeller, would that affect your rate of fire if you were throttling up or down?
they did say at the end of the video that they were only doing 200rpm because 1200k rpm would have the prop moving and it would be hard to catch footage of it moving
For the second question: Yeah, it actually would. But since you wouldn't normally fire the guns stationary on the floor you wouldn't notice the difference.
Actually you'd be surprised how much you notice the difference while flying. Whist playing the awesome and incredibly realistic first world war flight sim, Rise of Flight, I have often had to make a decision when diving on an enemy whether to throttle back to give me more time to aim with the lower rate of fire or give it full throttle, hope that I can aim in time and unleash a devastating hail of lead while hoping I won't over-rev and kill my engine :)
AFAIK, the 'trigger' momentarily switched off the autofire while the propeller was in front of the gun. So yes, it did reduce the rate of fire, but not by a lot.
No I'm afraid that is a common mistake people make, that was the Interrupter Gear which would as you say pause the automatic fire while the a propeller blade was in front of the muzzle of the gun. This never worked properly so the Synchronisation Gear superseded it, this would essentially have the machine gun working in a semi-automatic state and every time a propeller blade would pass the muzzle it would send an impulse to the trigger, firing the gun. If the next firing impulse came before the gun was ready (finished chambering the next round) it would not fire. This meant that the fire rate would peak at certain engine RPM counts where the firing impulses and the max rate of fire of the gun reached an equilibrium and then drop as the RPM increased and the impulses came too rapidly for the gun to have cycled the next round, this fire rate would then increase again as the engine RPM increased and so on. This staggering of firing rates is less noticeable in aircraft that used two of the later version Vickers Machine Guns which had a modification that increased the rate of fire (although the name of that mod. escapes me...) but the difference of fire rate between low and high RPM is quite noticeable as the overall maximum rate of fire is much higher.
Hope I didn't bore you with all that, I'm a bit of a nerd when it comes to this topic :D
Watching videos like this and also the vlog on SMG2, it always reminds me in the most interesting way, that Gav is actually brilliant. We see him as this goofy meatball of a guy in all the AH videos. But then you watch artistry such as this, and realize that as well as being adorably silly, Dan and Gavin are very, VERY intelligent. I honestly wish I knew these guys IRL, because I'd love to have friends like them.
Grateful for this vid... I too was told of a clutch system, but never understood it. Thank you
Amazing edit on the firing sequence. Bravo
Not sure how your connection is going to be out in the desert.
Not to mention bf1 servers suck
BF1 period sucks on PC, bunch of hackers.
Pat Nat really? Play bo3 then talk to me lol
+Demarticus Stone gr8 b8 m8 XD
Pat Nat I have played the beta and I have no issue with the servers
You slow mo guys should team up with demolition ranch to make a epic video with 50 cal bullets. like if you think it should be done.
Sauce Full Mag dose slow mo stuff with 50
Yeah... But that's full mag
Full Mag sucks
Agreed. On second thought the OP has a great idea
And they only live like 70 miles apart which isn't too bad!
Superb, guys. Impressed you built an interruptor. I thought they were set to fire when the blade was directly in front of the muzzle.
Love this channel
"It's the Nevada desert, there's nothing here." Car drives by at 1:03. You suuuuuure there's nothing around?
Cjduyck nothing worth seeing unless... you like watching passing cars
sweeeeeeeeeeeeeeeeeet
If those are 7.62 rounds I would ask for some casings since I'm making a chess set and need 7.62 to finish but. Chances are my comment won't be seen
What piece would the 7.62 be?
My guess would be a Rook? The bullet could be a Bishop :D
e gio either king and queen or bishops. I'm still working on it
M60 = 7.62 x 51mm, so yes.... but I question your comment. You need 7.62 to finish your chess set but don't know which pieces they'll be? Maybe take a hammer and make a checkers set :-P
Plenty of available spent brass at most gun ranges. If your country doesn't have those, then you likely aint gettin' brass.
You can just buy brass cases. They're sold for home loaders with or without the primers. As it's nothing but shaped brass, any country should allow you to order them online.
The exact timing of such a machine is truly beautifull
its way more simple than that, theres a gear stepped with the propeller connected to the gun, thats how they solved it
6:34 "Hard to focus on a moving.. plane."
I see what you did there.
I don’t get it 🖖
@@eh-9994 a plane is an aircraft, as you probably know. A plane is math is something unrelated, and in photography there's something called 'plane of focus' which I recommend you look up (it's hard for me to explain).
Now bullets vs bulletproof glass! Like if agree!
Try the search button.... it's been done to death.
But not by these guys.
Honestly I've never even thought of the bullets ever hitting the propeller in the first place. That's genius.
aquacharge lol me too
thank you for solving my mystery as well :)
I love the Garand ping they used as an effect for the bullet casing exiting the gun in the first shot
why don't you guys try ak-47 with bullet proof glass............ 😀😀😀😀😀😀😀😀😀😀😀😀😀😀😀
:P
+Raj Patel
this would be a really good idea! Hope they will do it!
+Raj Patel
this would be a really good idea! Hope they will do it!
Money
Because the ak-47 is an overrated weapon =P. Actually though a bullet striking bullet proof glass would be interesting, it wouldn't be as extreme as normal glass shattering, but the ripples and cracks would be cool to see
Full speed prop would have been awesome.
Err.... no. It would look exactly the same.
exept the propeller would be alot faster
I hope maybe you guys can revisit this in the future with a full speed prop, Not to see if the bullet will hit but how the prop and round will react, Will it make a hole or will the prop be moving fast enough to make a linear hole our gouge, will it knock the round off its straight flight path? If you could get access to someone with a prop test platform you could do it, you would not need the aircraft mounted gun either, just any hand gun or rifle. maybe in the future some time?
John Norris genial
The curved shadows over the body of the "airplane" made it look like rolling shutter a little bit lol. This was really cool to watch after watching the behind the scenes for it.
"What do you like about the first world war, the great war?" -Every brit starts frothing at the mouth.
Even though this is an ad, and usually I don't care about what a youtuber is sponsoring, this has actually made me look more into Battlefield 1 and it looked so good that I decided to get it on Xbox one. Cheers!
Bullets VS A Human Face
For science obviously.
do it on those trump protesters who cause all the riots.
"Crap, I forgot to hit record. Do it again!"
Kool Aid Boy 232 indeed sir *clap* *clap* *clap*
Kool Aid Boy 232 Do you not know how to conceptualize text?
Kool Aid Boy 232
trump protesters: a group of SJW's who protest trump's election victory. please go and google it.
The best thing about filming in slo mo is that you can never have a shaky video
Since Years in every Video the right guy says right away "I´m done" and yet he is still there!
This is the most incredible Slow Mo Guys video I've ever seen
I have an idea; drop a fire ball under water and watch it extinguish.
Lol at 2:14, the guy behind the "plane" is like, "Wait for me!"
Gav's 'double look' at the propellor is killing me😂😂😂
Battlefield 1 is a good game. ;D
The RunawayJ I agree
Overhyped, but it's alright.
TheVanezi It's lived up and exceeded MY expectations
You must not have expected much
they fucked up pretty big on the weapon aspect (aside from the melee)
but how does the syncing work mechenically? does anyone know?
There's an article on Wikipedia that goes into detail.
There are several ways it's been done. look up synchronisation gears or interrupters and there are some very useful diagrams.
I wonder, what is Google?
FALCO LOMBARDI something to do with a switch that triggers and only allows the gun to fire when it hits it is think
ok cool
The sound alone is cool enough but how it looks and how its edited is like Gavin said majestic
Wow. Incredible footage.
The music they use in every vid is so perfect ❤️
We're in the desert so no one will be harmed *bus of school children drives by*
it's "With the Frizz? NO WAY!"
*Many Children were Harmed After*
😂
Not funny =_=
Climb on the Magic School Bus!
In an alternate universe: “Dad, i’m sorry...they got us”
The French just put something to ricochet the bullet the German made a interrupter gear box
was just thinking i think there was a mechanism that wouldn't allow a bullet to be fired when the propeller blade was in front of the barrel. Otherwise their propeller would just get shredded
Anthony Fokker was dutch he invented the interrupter
i kind of wanted them to saw part of the blade off
That would have looked great. Steep ammo bill by the time it occurred, though.
Patrick Roelant
Love RWBY
if you want a failure like that you need to shoot it with a minigun
pikadude1996 or just shoot it for a long time.
You could custom order a propeller that has no angling. It wouldn't be able to produce thrust, regardless of RPM.
I was just thinking the same thing then read your message. It would have made a better video if the prop was moving at full speed. You just need a blade the that cut's through the air but produces no thrust
@@deancyrus1 It would not have made a better video. Both of you seem to forget that the results would be the same at full speed.
200rpm vs 1200rpm the bullet is still trucking on through the prop like it was stationary.
It's not like the prop is going to knock the bullet off course or deviate it in any significant way.
Like Gav said, they're dealing with "orders of magnitude" so therefore you'd need 20,000rpm to even start to make a difference.
_Bullet through jet engine perhaps??_
@@beefcakeandgravy I think the implication if having the propellor rotate faster is that more bullets would have hit it.
@@beefcakeandgravy Thing of it is, if the prop was spinning faster, there would be more stress on the blade, potentially resulting in some more explosive strikes when the bullets hit.
Everyday is a school day, great video
Casually talking while the gun is pointing at his head with chambered bullet
"there is nothing out here, its a perfect place to fire guns" *blue ford ranger sport 4x4 drives by*
*and black landrover drives by later on*
Hey. No one died ^_^
Why not just say "Truck drives by"
wilderness survivor I saw the truck drive by just as I read your comment!
they werent down range
I like how all the bullets went through the same propeller.
Thanks for sharing
I feel so calm when the slow mo music plays
"I'm sorry Indi, I think they got us..."
I learned about that synching when i saw it in an A-Team episode.
Sadly for Murdock the synch chain broke and he destroyed his own propeller mid-fight XD
I really can't stand watching Gavin put his face right in front of the gun, I assume it is never ready to fire when he does but good lord you have the entire desert to stand on and yet you choose the one and only place where you can get shot by your own contraption - remember everyone no matter how sure you are the gun is empty never aim at anything you do not want shot (or in this case do not place your head directly in front of the gun ^^')
Well I've got great news for you then! Not once did he put this head in front of the gun. Not sure what video you were watching... Or maybe you were fooled by the angle everytime he was on the opposite side. But either way, and from the 7 minutes of footage that was published here, he never had his head in front of the gun. CLOSE to it maybe but NOT in front.
John Meise 4:41
@@glasshalfempty1984 Naw I saw it for sure, it made me anxious when I noticed. That's why I came to the comment section, I was trying to see if it made anyone else anxious too lol
@@glasshalfempty1984 Pretty sure you're right and it's a perception issue, but it really does look lined up....
his head wasnt infront of the gun. the gun is in the middle of the metal contraption. Gavin was on the side. it appears he was, but he wasnt infront of the gun. forum closed thanks and bye. 🙂👍
love this one
Now do bullet vs bullet
Shoot the guns at same time and let the bullets collide into each other
Prime Comedy extremely hard to do
Sadly it doesnt describe the sync gear at all. At least that was what i awaited.
Alexandr Škaryd same here
Brian Martin what did u want to say my friend?
It's not much to explain just take the speed of the prop and the gun find the highest common denominator inside the guns capacity to shoot and gear it as such.
Yes. While that sounds simple, its not from engineering point of view..
But a plane's propeller rotates and different rpm depending on if you're trying to speed up or slow down or stay level.
And the sync would slide in any case, because the engine wouldn't hold an absolutely steady rpm. So you have to have some positive mechanical link between the crankshaft of the engine and the firing mechanism of the gun that holds off firing in the critical time as the blade will pass in front of the muzzle.
Undeniable beauty.
This question has been on my mind for three days.