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
@raedev5 ай бұрын
"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!
@kilotheneko20645 ай бұрын
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 ?
@perchperkins67205 ай бұрын
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.
@Billybibjoe-f6o5 ай бұрын
@@kilotheneko2064yes, you know some odd vacuums are made this way.
@nidhu5955 ай бұрын
sounds to me like a mouth powered atomiser ( www.google.com/search?q=mouth+atomiser )
@rymanjones35 ай бұрын
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
@matt_yuan5 ай бұрын
e x p a n d
@stevenramsay58875 ай бұрын
Bigmode@@matt_yuan
@tomarmadiyer26985 ай бұрын
That's so brilliant.
@ALuLdz5 ай бұрын
To be fair I wouldn't be surprised if Matt could find a way to defy physics
@some_random_toaster5 ай бұрын
Because he can.
@eashw5 ай бұрын
that pen holder from the beginning is very clever!
@matt_yuan5 ай бұрын
ty!
@kartikgkalita20 күн бұрын
His entire way of machining is genius
@Gamer34275 ай бұрын
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.
@pedrohenriqueboscofi5 ай бұрын
Genius, not because of the blaster design but how smart you were manufacturing it
@indoraptor-k6f5 ай бұрын
That drill press balance is such a good idea
@badsamaritan82235 ай бұрын
The dart is so excited for it's turn to get launched, that it wiggles forward into the barrel.
@Tamakhanz5 ай бұрын
Matt, your production quality has actually gotten that of a professional.
@matt_yuan5 ай бұрын
tyty
@TastySlowCooker2 ай бұрын
Your English has actually gotten that of an amateur
@blockshift758Ай бұрын
0:40 my guess is how vaccums work
@blockshift758Ай бұрын
Welp it was simpler than expected.
@darth_dan88865 ай бұрын
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.
@AlexLanyu5 ай бұрын
o7 rip sacraficial dowels
@matt_yuan5 ай бұрын
they will not be forgotten
@Okamika444 ай бұрын
@@matt_yuan type F in the chat
@xrad1us4 ай бұрын
F
@wertacus4 ай бұрын
F
@galning27684 ай бұрын
F
@TheOnlySoycicle5 ай бұрын
I love how this channel grew from simply modding a long shot and now defying physics itself
@thebfiaid9575 ай бұрын
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.
@SteakToad5 ай бұрын
Your resourcefulness and clever tricks are a treat to watch and make you more defined from other channels
@gadgetdeez70694 ай бұрын
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.
@simontillson4824 ай бұрын
Yep. Great explanation, man. It’s all down to momentum.
@Cheezeball999994 ай бұрын
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.
@BC-wj8fx3 ай бұрын
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.
@VaIentineUK5 ай бұрын
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!
@beretnarf5 ай бұрын
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.
@matt_yuan5 ай бұрын
nope
@beretnarf5 ай бұрын
@@matt_yuan 😥
@azurepattycake5 ай бұрын
@@matt_yuan You really should, all of your stuff is very cool and reminds me of old Nerf homemades
@SlavicEgg5 ай бұрын
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
@solarsoldier24565 ай бұрын
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?
@Qikx5 ай бұрын
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!
@excell2115 ай бұрын
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.
@simontillson4824 ай бұрын
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.
@nirodha70285 ай бұрын
Everything about this build is clever and shows your skill as a designer ‘and’ craftsman. Well done!
@infinidragon5 ай бұрын
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.
@matt_yuan5 ай бұрын
i like the unfinished look
@infinidragon5 ай бұрын
@@matt_yuan If that's your preference no worries, was just curious if it had ever crossed your mind. Appreciate the reply!
@StupidGuy11255 ай бұрын
I’ve been here since your first video. You’ve come a long way.
@Valin92754 ай бұрын
Modern day RSCB
@siosilvar12 күн бұрын
Exactly what I was thinking... late 2000s design, but with much better production value than the old homemades.
@ok1984744643 ай бұрын
I automatically knew it uses vacuum pressure basically
@adamiozsa29674 ай бұрын
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.
@BC-wj8fx3 ай бұрын
Almost right but air can't drag anything, it can only push.
@prjndigo4 ай бұрын
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.
@dtplayers4 ай бұрын
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.
@terence79chan5 ай бұрын
Nice work as always! Thanks for the useful techniques to accomplish that precise slot on the cylinder.
@Chaos_God_of_Fate4 ай бұрын
Nice clickbait title- you cannot defy physics. *Rings a bell* SHAME! *repeats forever*
@zephiask17584 ай бұрын
More like "defies your intuition of physics"; would be clickbaity enough while not being a false statement in lots of cases
@mrfawkes91104 ай бұрын
Oh you can defy physics, it just never works out.
@GoGoGoRunRunRun4 ай бұрын
It's not really clickbait, because everyone understands that...
@MrSoso10504 ай бұрын
More like...... eh.....idk
@SpencerPaire4 ай бұрын
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!
@chikokishi70304 ай бұрын
2:00 im pretty sure a normal ruler would have worked too.
@jadgpanzerkid5 ай бұрын
MAKE A MAGAZINE FOR THIS 🗣️🗣️🗣️🗣️🗣️🔥🔥🔥🔥🔥🔥🔥
@skylerric35 ай бұрын
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!
@Maxb0tbeep5 ай бұрын
I met you and open sauce and shot the blaster you had there. it was super cool! thanks for letting me try :)
@Gtagpaintervr5 ай бұрын
Wake up there’s a new Matt yuan video
@theaureliasys63624 ай бұрын
Venturi. At least that is my first thought.
@ocha95205 ай бұрын
mate bloody good job, amazing work
@insu_na4 ай бұрын
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
@_Greyboi_5 ай бұрын
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.
@phaedrus121345 ай бұрын
I'm in love with your builds. You should build nerf blasters for NASA.
@Blorkus5 ай бұрын
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
@lychiadventures82314 ай бұрын
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
@The_Enclave-e4g4 ай бұрын
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
@prxrb5 ай бұрын
Love all the creative solutions to make do with what you got!
@Rheumatoidarthritis5 ай бұрын
hey, your editing is getting pretty good. I'm really looking forward to seeing you improve even further.
@perchperkins67205 ай бұрын
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
@mrburns36611 күн бұрын
It's interesting to note that nothing can "defy physics." Anything that appears to is only illustrating something we may not have known already.
@westincello4 ай бұрын
There are so many smart build tips for working with tubes! Great video!
@chumooskie55275 ай бұрын
Who are you, who are so wise in the ways of science?
@DartDynasty5 ай бұрын
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
@taffy48015 ай бұрын
You are doing homemade designers proud! Build on!
@matt_yuan5 ай бұрын
skewers r cool
@daltooinewestwood638026 күн бұрын
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.
@ABean565 ай бұрын
New Matt Yuan video? Ok!
@indoraptor-k6f5 ай бұрын
I'd say the reason why the next dart is brought forward is due to the Venturi effect
@hondoonaka18235 ай бұрын
Not the Venturi effect, it’s actually another application of Bernoullis principle, so pretty close.
@pauljs755 ай бұрын
The charge of air leaving the barrel has inertia, so it will draw a vacuum as it exits.
@kieran.grant_23 күн бұрын
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
@Gusdoesgames5 ай бұрын
Oh my goodness I get to see a Matt yuan video less than an hour after he posted
@jellogiant4 ай бұрын
You’re the hero we don’t deserve my friend. Seeing you continue to develop traditional nerf modding give me the warm fuzzies
@dserrao7188Ай бұрын
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.
@SrBuhler5 ай бұрын
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.
@aliveandwellinisrael250727 күн бұрын
The way it works is great, but those practical tricks you used when actually making it earned my subscription.
@tommyblair60084 ай бұрын
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.
@jeffreyyoung41044 ай бұрын
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.
@oscarjan8764 ай бұрын
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
@xavifores45994 ай бұрын
Man the engineering genius that went into designing this thing is insane and it deserves some respect and recognition 😊
@dragonlordd78943 ай бұрын
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.
@matt_yuan3 ай бұрын
thanks!
@samuelhayes51984 ай бұрын
This weird thing is also how vacuums with no moving parts and powered by compressed air work
@SpencerPaire4 ай бұрын
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 😂
@CRaZzSHarP5 ай бұрын
I'd love to build some of your designs to add to my homemade collection. Awesome work!!!
@Sniper_Plague5 ай бұрын
i love the trigger spring. using a nerf dart tip is so smart but simple, and yet, very few would have thought of that.
@thecompl33tnoob4 ай бұрын
The pen-holding technique garnered my subscription. I can't wait to share it (and your channel) with our maker co-op folks!
@recklessroges5 ай бұрын
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.
@omurize20075 ай бұрын
I wonder if this will work with an XBZ as the air source?
@AudioFanMan4 ай бұрын
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!!!
@originalSPECTER4 ай бұрын
Likely, when the round leaves the barrel, that’s creating a temporary pressure drop beyond negative, like if you were to plug the hole with your finger and then pop it out, you can feel the suction.
@CrimsonSlug24 күн бұрын
My hypothesis is that the rear dart is pulled forward by the high speed air entering the barrel in front of it. As fluids speed up then decrease in pressure and this low pressure will pull the rear dart forward until it blocks the air hole. Hence the short distance moved.
@WTShammas3 ай бұрын
This looks like a bit of the Venturi effect drawing the rear dart forward after the first dart is fired.
@audendavis94224 ай бұрын
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.
@syborg645 ай бұрын
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
@lordicarus880724 күн бұрын
What I like most about this kind of videos are the solutions that are given to problems in ways I'd never imagine!
@isstuff4 ай бұрын
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.
@noahlowrie67425 ай бұрын
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!
@Diabetto-hv3dn5 ай бұрын
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.
@doctordingi5 ай бұрын
these are some excellent blaster videos, keep it up :3
@granttoye5852Күн бұрын
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
@unknowntraceur2644 ай бұрын
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!
@SlendisFi_UniverseАй бұрын
Pressure difference. The plunger creates high pressure that escapes through the barrel and propels the first dart out. This action causes short but sgnificant enough moment of low pressure like in vacume cleaner that sucks the second projectile inside the barrel. Powerful enough to suck it in but weak enough to not double fire.
@rosiebun28Ай бұрын
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
@captainslow_0375 ай бұрын
bro made a nerf recoilless rifle
@Dallen9Ай бұрын
I wouldn't be shock if all that is happening is the first dart is creating a vacuum strong enough to forcefully drag the second dart forward in the loading chamber.
@theempty3340Ай бұрын
That is quite interesting. It seems as though the dart created suction pulling the second into the chamber. I'll bet that if you cut the barrel shorter, it would actually improve FPS as opposed to lengthening to increase the autoloading effect. Perhaps a telescopic barrel or variable pressure valve as a fire select mechanism?
@AarontheFishCatАй бұрын
Using dowels to support the drill bit was genius and I wish I knew that sooner
@SwapPartLLC4 ай бұрын
Something may defy your understanding of physics, but nothing defies physics.
@Pixillnow4 ай бұрын
As someone who is not familiar with this space, The sheer amount of little tricks in this video is so cool
@Sicsempertyranus3135 ай бұрын
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
@doodlebug47Ай бұрын
i dont know much about how nerf guns work. so when you explained how they *usually* function, and then immediately threw that explanation out of the window my small brain imploded.