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
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.
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!
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.
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.
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!
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.
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
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.
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 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.
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
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.
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!
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.
The rear nerf dart gets compressed backwards by the air-pressure, then after the pressure drops again, it decompresses, and since it got compressed backward, it springs forward and goes until friction stops it. Clever design, btw. (c:
At first, i thought it was based on the Venturi effect. Then i saw the breach, and thought it used the vaccum generated after it emptied the air to launch the dart. Turns out, it was way simpler than that
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
The reason i think the dark that is loaded moves up into the chamber is due to a vacuum being formed. As the first dart ejects out of the barrel it creates a tugging force or vacuum, and the other dart wants to move to help reduce the vacuum as the air on the other side wants to get in. But once the first dart leaves the barrel the vacuum dissipates as air rushes into the barrel of the gun. leaving the second dart ready to to fire.
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
interesting design, it reminds me a bit of those lever repeaters, the design could certainly use some improvements though, best of luck! btw I'm still kind of mad that you didn't violate physics.
What probably happens to the dart is that it gets sucked in, and then the opening behind it gives an easier way for air to release pressure through the back as soon as the dart passes the hole
Observe the Matt Yuan. This wonderful and magnificent creature is a rare subspecies of the Homosapien. They can typically be spotted on the platform known as "TH-cam", and can be seen messing around with nerf guns, building nerf guns, and defying physics.
I'm probably never going to build a Nerf blaster in particular but i really like the construction techniques you used, i will adopt some of them. If i don't forget.
I totally thought this was going to be a venturi effect type thing and I imagine that's what pulls the second dart forward, reduced by the fact the othsr dart raises the pressure.
I think maybe the air is grabbing the holes in the head of the dart, which pulls it forward. You might be able to test that by getting half-length darts with a solid tip (or just cutting regular Nerf darts in half) and see if there's any difference.
The sealing dart could be being pulled along with the air after the fired dart leaves the barrel, the excess air rushing past with less resistance might be able to pull the back dart forwards. the lower pressure idea makes sense as well though, might be worth making a test breech with pressure gauges to see what's happening.
There is a good chance that the rushing air drags the dart a bit. It can also be that after the dart is released that the moment it leaves the barrel the pressure for a second is flushed out by momentum which in turn creates a temporary low pressure zone until the atmosphere refills that area. Hell, it could also just be the intial kick and the dart collides with the plastic lock and the foams elasticity knocks it forward. More data is needed.
I think what happening is the dart in front is a projectile while the rear dart is the rear seal of the barrel, and when the front dart moves the rear dart acts similar to a air restrictor, because there is a small vacuum on the head of the dart, causing the outside air pressure to push the rear dart forward.
In the foam dart world, thats basically just a 'linear magazine'. I think there was a different name, but it's been a long while, since very few build blasters that use that concept anymore. That type of operation simply used a proper barrel at the front, with a larger cavity at the rear, so only the dart that was jammed into the barrel would actually be propelled, while the following dart would either get pushed in as well, or you'd have to shake it into place yourself.
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
The air traveling out the barrel has momentum it lowers the pressure at the rear enough to have the outside pressure apply a small force to the second dart. You can look at different ways to measure any reward force to disprove the compression/bounce theory. You can also look at building other seals around the rear of the beach that would help prove the greater air pressure behind the dart or just directly pressure ahead of the breach.
Similar to the Venturi effect, when the air pushes the first dart through the barrel, as the rear dart is not a perfect seal, it will draw that along for a moment as the high speed air passes by. Similar to how a Dyson bladeless fan works. (or a venturi oxygen mask for the old as hell current/former emergency healthcare peeps)
I think you could get a cleaner slot in the barrel using an end mill in the drill press and clamping the tube to the aluminum, then just sliding the aluminum back and forth. It would get rid of those wavy edges and allow for more consistency in slot with, while also taking less time and precision.
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!
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 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 )
that pen holder from the beginning is very clever!
ty!
To be fair I wouldn't be surprised if Matt could find a way to defy physics
Because he can.
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@@mattie_y
That's so brilliant.
Matt, your production quality has actually gotten that of a professional.
tyty
o7 rip sacraficial dowels
they will not be forgotten
I love how this channel grew from simply modding a long shot and now defying physics itself
That drill press balance is such a good idea
The dart is so excited for it's turn to get launched, that it wiggles forward into the barrel.
Genius, not because of the blaster design but how smart you were manufacturing it
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.
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!
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!
Your resourcefulness and clever tricks are a treat to watch and make you more defined from other channels
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
@@mattie_y 😥
@@mattie_y You really should, all of your stuff is very cool and reminds me of old Nerf homemades
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 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
Nice work as always! Thanks for the useful techniques to accomplish that precise slot on the cylinder.
I’ve been here since your first video. You’ve come a long way.
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.
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
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!
hey, your editing is getting pretty good. I'm really looking forward to seeing you improve even further.
Love all the creative solutions to make do with what you got!
these are some excellent blaster videos, keep it up :3
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.
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
this is a genius catch mechanism
I'd love to build some of your designs to add to my homemade collection. Awesome work!!!
I met you and open sauce and shot the blaster you had there. it was super cool! thanks for letting me try :)
I love ur approach when you design all of these. Keep it!!! The content is 👍
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
@@mattie_y If that's your preference no worries, was just curious if it had ever crossed your mind. Appreciate the reply!
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 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.
mate bloody good job, amazing 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
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.
Nice, this was a great redesign to make it capable of automatically reloading!
i love the trigger spring. using a nerf dart tip is so smart but simple, and yet, very few would have thought of that.
Oh my goodness I get to see a Matt yuan video less than an hour after he posted
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!
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.
bro made a nerf recoilless rifle
The mechanical design and color's trigger something nostalgic for me
I'm in love with your builds. You should build nerf blasters for NASA.
Theoretically this is how a very compact pullpup weapon could become made.
The rear nerf dart gets compressed backwards by the air-pressure, then after the pressure drops again, it decompresses, and since it got compressed backward, it springs forward and goes until friction stops it.
Clever design, btw. (c:
At first, i thought it was based on the Venturi effect. Then i saw the breach, and thought it used the vaccum generated after it emptied the air to launch the dart. Turns out, it was way simpler than that
Amazing video. Really like the channel
Using a dart head as spring-like thing for the trigger was really interesting
The dart being fired is definitely causing a vacuum to be made which is what causes the back dart to be moved forward.
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
Thoughly impressed at the build quality. Some very clever build methods. And great attention to detail. You are very skilled
The reason i think the dark that is loaded moves up into the chamber is due to a vacuum being formed. As the first dart ejects out of the barrel it creates a tugging force or vacuum, and the other dart wants to move to help reduce the vacuum as the air on the other side wants to get in. But once the first dart leaves the barrel the vacuum dissipates as air rushes into the barrel of the gun. leaving the second dart ready to to fire.
You are doing homemade designers proud! Build on!
skewers r cool
I think it’s drag of the air passing the second darts tip and the barrel pressure behind the first dart prevents it from fully entering the barrel
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
One of my favorite channels!
interesting design, it reminds me a bit of those lever repeaters, the design could certainly use some improvements though, best of luck! btw I'm still kind of mad that you didn't violate physics.
What probably happens to the dart is that it gets sucked in, and then the opening behind it gives an easier way for air to release pressure through the back as soon as the dart passes the hole
Observe the Matt Yuan. This wonderful and magnificent creature is a rare subspecies of the Homosapien. They can typically be spotted on the platform known as "TH-cam", and can be seen messing around with nerf guns, building nerf guns, and defying physics.
I'm probably never going to build a Nerf blaster in particular but i really like the construction techniques you used, i will adopt some of them. If i don't forget.
The suction is definitely a theory
but also the squishing
Great stuff
Wake up there’s a new Matt yuan video
You could flip the plunger around and seat the breach at the back of the blaster for a bullpup design
You have superior engineering sensibilities.
I totally thought this was going to be a venturi effect type thing and I imagine that's what pulls the second dart forward, reduced by the fact the othsr dart raises the pressure.
I think maybe the air is grabbing the holes in the head of the dart, which pulls it forward. You might be able to test that by getting half-length darts with a solid tip (or just cutting regular Nerf darts in half) and see if there's any difference.
The sealing dart could be being pulled along with the air after the fired dart leaves the barrel, the excess air rushing past with less resistance might be able to pull the back dart forwards. the lower pressure idea makes sense as well though, might be worth making a test breech with pressure gauges to see what's happening.
There is a good chance that the rushing air drags the dart a bit. It can also be that after the dart is released that the moment it leaves the barrel the pressure for a second is flushed out by momentum which in turn creates a temporary low pressure zone until the atmosphere refills that area. Hell, it could also just be the intial kick and the dart collides with the plastic lock and the foams elasticity knocks it forward. More data is needed.
The rubber dart head as a dampener was pretty smart ngl
Low pressure sucks the dart in due to the Venturi effect. I'm 99 percent sure.
Wait that’s actually really cool. If and when you make the mag fed version are you willing to do a commission for it? I’d love to run it in a game
Firing the forward dart creates a minute vacuum which pulls the rear dart forward
good stuff dude! very clever.
I think what happening is the dart in front is a projectile while the rear dart is the rear seal of the barrel, and when the front dart moves the rear dart acts similar to a air restrictor, because there is a small vacuum on the head of the dart, causing the outside air pressure to push the rear dart forward.
In the foam dart world, thats basically just a 'linear magazine'. I think there was a different name, but it's been a long while, since very few build blasters that use that concept anymore.
That type of operation simply used a proper barrel at the front, with a larger cavity at the rear, so only the dart that was jammed into the barrel would actually be propelled, while the following dart would either get pushed in as well, or you'd have to shake it into place yourself.
I remember them being called "inline clips", which in spirit is really the same thing. Its nice to see it done so cleanly though.
now give it a main battle tank style breech block cover thing that closes automatically when you load a dart
awsome blaster!
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
All of these tricks you're using are so cool! were these trial and error or did you find them online?
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.
Works exactly like the lynx from Orion blasters expect you used the dart as the pusher to push and seal the dart in the barrel
That intro was sick!
Now you can do a new version with a magazine attached to the back of the barrel.
The air traveling out the barrel has momentum it lowers the pressure at the rear enough to have the outside pressure apply a small force to the second dart.
You can look at different ways to measure any reward force to disprove the compression/bounce theory. You can also look at building other seals around the rear of the beach that would help prove the greater air pressure behind the dart or just directly pressure ahead of the breach.
I think that what was keeping the sneaky dart in place was the power of pure spite
Similar to the Venturi effect, when the air pushes the first dart through the barrel, as the rear dart is not a perfect seal, it will draw that along for a moment as the high speed air passes by. Similar to how a Dyson bladeless fan works. (or a venturi oxygen mask for the old as hell current/former emergency healthcare peeps)
I think you could get a cleaner slot in the barrel using an end mill in the drill press and clamping the tube to the aluminum, then just sliding the aluminum back and forth. It would get rid of those wavy edges and allow for more consistency in slot with, while also taking less time and precision.
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!
Maybe that back dart got pulled by the air travelling at great speed
New Matt Yuan video? Ok!
awesome!
Yes...
Some suction is going on.
Race engines take advantage of this with what's called scavenging during valve overlap.
Would be cool to see if you could make a blaster that used vacuum to accelerate a dart rather than pressure.
Something tells me the right angle where the air is forced out may be slightly inefficient. Right angles, something about shockwave and right angles.
It could be a drop in air pressure causing the dart to move forward a little