"The Coilbow" - Spring Powered and Home Made!

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[@LK-ky8yz]

Whenever Joerg presents some new contraption there is a new band-aid on his fingers 😂🤘🏻

[@Slingshotchannel]

jorgsslingshotinjuries.quora.com/

[@sinisterthoughts2896]

@@Slingshotchannel only you would have a chronicle of injuries! Here's hoping you manage to stay in one piece!

[@Fuerwahrhalunke]

​@@Slingshotchannel Jörg, wo gehobelt wird, fallen Späne! :-)

[@bookofrevelation4924]

Ha.. ha..ha, do you think Jeorg edits out his more serious injuries from anyone knowing?

[@thomygoldman324]

@@Slingshotchannel ah, yes, the Joerg injury Lore.

[@RonTheelen472]

Maybe by lubricating the mechanism you can get more power out of that thing. Dry graphite powder does a good job in lubricating wood to wood joints.

[@de0509]

Not the core issue tho. The main issue is too much of the energy going into movements of the mechanism rather than into the projectile itself

[@yonblek4542]

Gun barrel ? A long tube might guide it in one direction making for a smoother release.

[@0v_x0]

Yeah and the wood being a soft and rough material but still pliable means any friction is being multiplied. I think a computer machined aluminium frame with bearings could make a huge difference along with born block and tackle. It explains why he has such a heavy draw weight with loads of energy lost on the release.

[@daviddavidson2357]

You want some really powerful self contained coil springs Jeorg? Get some rope returns for magnetic rowing machines. They're coil springs contained inside a plastic case, weigh about 1kg and have the spring pre-tensioned with two bolts sticking out so they can be indexed. Perfect for building a crossbow out of. Snapped one on my previous rowing machine and was extremely thankful I wore a face shield when trying to bend it back into its slot as the spring launched itself right into my face.

[@Zane-It]

Good idea or better yet an automatic garage door opening spring.

[@daviddavidson2357]

@@Zane-It Can you get coiled garage garage door springs? I've seen straight garage door springs but if they make coiled ones then that thing would be powerful AF.

[@Zane-It]

@@daviddavidson2357 yes I have seen them in southern California.

[@daviddavidson2357]

@@Zane-It How big are they? If you could mount them on a crossbow frame you'd have one cool crossbow.

[@Zane-It]

@@daviddavidson2357 the matinance people didn't let me get close to the spring in fear that it would hurt me so I couldn't tell you how big it was.

[@lick3227]

Ah yes, Joerg Sprave. German engineering distilled to its highest potency, given physical form.

[@VeritasNumquamPerit]

German technology is the world's greatest!! -A certain buff german cyborg anime guy

[@rebel4466]

Imagine what Jörg could do if Germany had similar gun laws to the US. He'd be a one man army.

[@skibur848]

@@rebel4466 We can only dream..

[@olinseats4003]

I can see a few ways to improve the basic performance: First, replacing the paracord with a proper bow string. It's an ok substitute for testing, but between its weight, how much it stretches, increased friction, etc... Paracord wastes a lot of power. Likewise, I think the string stop's design interrupts the powerstroke at a crucial moment. I don't have a solution for that, but letting the string follow through might be better. Of course, as stated in the video, there's also the weight of the spring housing. anything that could be done to safely lighten them would be beneficial. Someone else also mentioned graphite powder lubrication, which would help. The one thing I think it really needs, though, is stability. the design would really benefit from either a counter weight or more likely,a slingshot style arm brace. that would improve the draw considerably.

[@EgadsNo]

You've been resisting metal power storage for years in your inventions- so cool to see this new chapter. (*edit*) Also if you plan on incorporating speed advantage you might also want to try the other type of torsion spring, like the kind used in say a clothes pin- they are strong and compact enough to be used for the suspension system of tanks.

[@Feardain]

I was thinking, mouse trap springs myself, along with a shorter bolt.

[@michaelmartin8337]

AWESOME PROJECT Joerg! I was wondering how to create something like this - smaller than a crossbow but with more or less the same power Thanks!

[@Slingshotchannel]

Hey, thanks for that! Super cool.

[@just_chillin1010]

i love that this wholesome german man has been making crossbows, slingshots, whatever for more than 6-7 years!

[@datpudding5338]

You might want to take a look at air powered "object acceleration devices"* _*this term is sponsored by your Bundesresgierung_

[@davidplatenkamp]

such contraptions do exist and are chemically powered.

[@-_ellipsis_-5219]

I've been working on a really similar design that uses rubber torsion instead of spring coils for some fiction of mine. I love how yours looks like two yoyos strapped together to a pistol!

[@leokimvideo]

I swear this channel is being heavily shadow banned by Google. I'm noticing it's now never featured in my feeds. Gotta love amazing KZbin where real organic popularity is replaced with AI shaftings of the the real popular content.

[@WeighedWilson]

KZbin favors channels that advertisers don't fear. It's playing dirty, but they make more money by suggesting channels that KZbin can sell ads on.

[@QrozOne]

That's absolutely true, I always have to manually come to the channel because YT treats it almost as if I'm not subscribed at all.

[@danielreardon6453]

The over lords don't want any common to have any resemblance of self defence

[@Dunge0n]

Can't have peasants making homemade weaponry in the (post) apocalypse.

[@SitioLumbia]

I'm about to sleep and this pops up. Let's have our priorities straight.

[@shadowsketch926]

this can absolutely work if you replace some parts, better springs, a material to replace the blockiness of the wooden cylinders at the front, and you're already closer to a product that might feasibly have market appeal! that said, lovely work Joerg, love your videos!

[@wowf0rl1f3]

Maybe you can make one with with a massive custom spring and some aluminum rotors for some serious power. Still keep the wooden body and all. Guaranteed you could start a Kickstarter and people would pay for the materials and the custom spring(s) and you'd have a spring bow more deadly accurate and powerful than ever seen before. I'm talking like high end compound bow power in a hand held size, if anyone can do it, it's joerg and his fan base

[@ianhelyar9553]

Watching his hand shake, I immediately thought of a wrist brace.

[@wowf0rl1f3]

@@ianhelyar9553 oh yeah, like the have it as a gauntlet or wrist mounted

[@ianhelyar9553]

@Linus Fu I think he's probably right that the wooden wheels absorb too much power as they spin up. Effectively, he has a very heavy arrow he's trying to accelerate, then a tiny portion of it flies. KISS principle applies. That's why the really effective drivers of arrows use speargun rubber...minimal extra mass.

[@lookoutpiano8877]

I am amazed you made this considering our conversation on a previous video. The proof of concept does give us an idea of what a compact Lancehead might be like (block and tackle setups aside). Thanks for sharing this with us!

[@xyzero1682]

Cool idea. I can clearly see its instability from not connecting the "bow" to the back of the arrow via a wide 3-point triangle. Amazing design!

[@RaisedbyaWildPackofCigarettes]

Honestly, ever since 2008 you've given me such peace of mind. They say WW4 will be fought with sticks and stones, but I will gladly be able to show you their features and it's all thanks to you.

[@alexm.6148]

This makes me think of early firearm prototypes, the kind where it's clunky now but you can see the potential already. Stronger springs, a block and tackle system, aluminum body, and bearings to help it all run smoothly would make this a beast for its size.

[@archery.customs]

I agree, those type of springs give a constant draw force curve and in theory could have 100% efficiency. Great build my friend 👏

[@areadenial2343]

Great stuff! There is definitely room for improvement here. One idea I had is that you could couple the bowstring to the springs using a non-constant gear ratio, to achieve draw characteristics similar to a compound bow. Springs linearly increase in force the more they are compressed, so it would be beneficial to counteract this with gearing, giving the springs a more or less constant force. Instead of wood, you could use 3D-printed spools for the bowstrings to reduce the weight and inertia. All of these improvements would result in a compact bow with much improved performance.

[@OllieW501]

Could you build a variant with an instant legolas? Then you could use the finger rest at the end to help keep it stable?

[@joegrassel]

A SIL on this would be cool.

[@MrBloodySerb]

That would allow him to put springs at the back and use nexus 7 speed hub from the bicycle to gain speed. It would raise price by at least 500 euros, but would be way better. This is actually something very interesting and has a lot of potential.

[@du_auch_da4520]

Interesting concept but rubber would be so much more effective

[@malte_volkerson]

Love, that you still do these homemade inventions. Feels, like, you are really in there and you do stuff, no one thought about before. Follower since 2010 or sth. keep it up!

[@okkami676]

I really love the way he talks! It's the main reason I watch. You can feel his passion for his gear in his voice :)

[@ReavinBlue]

The spinning of the disc looks like it has a lot of friction! Great looking bow

[@thomasduffney8245]

whenever I watch one of your videos it gives much joy because of how positive you are.

[@The_Dirt_Guru]

Looks like a lot of friction on the string stop - maybe change the shape of the string stoppers so less string sliding along their sides.

[@lightningstriking7]

You are no dummy this is a fact that I and thousands of others who mainly know you through your youtube channel, will attest. But your craftsmanship along with your engineering capabilities, to me, are freaking awesome!!!

[@l4w1nc0l7]

needs the arm rest thing to stabilize from pulling the string and stabilized when aiming

[@Marvin_R]

i wonder how well this would work when integrated into a gauntlet. could be interesting for mounted archery. you can hold the reigns tight until the moment you release.

[@JelMain]

You'd need a steel bolt and a retracting magnet as part of the firing mechanism to stop it being thrown off by the horse beats.

[@mikemcdonald2755]

Seriously my favorite human I've ever seen! Absolutely love all your inventions!

[@hoovyonlifesupport1129]

Im so glad you never strayed from your original content. Your rubberized weapons are all deadly and amazing

[@ARandomTroll]

Simple inline design: trampoline tension spring pulls cord on small side of cam- connected with large side of cam, which pulls the string. Gives the mechanical advantage of a compound system and even allows for constant draw weight and let-off.

[@docink6175]

the engineering and craftsmanship is spot on as usual

[@rlwhitefield]

You are one of my all time favorite KZbin pros

[@ElmerJFudd-oi9kj]

Actually this is no longer a cross bow without a cross or a bow.😉

[@nirodha7028]

Love it Joerg! Finally another interesting new approach from you! What I would recommend for the draw to be less awkward is to put the grip in front of the two wheels and not below it. Make the pull in line with your holding hand. For a design like this in which the pull of the strings is really linear in relation to your hand much different from a normal bow… a perfect central hold is crucial. You can space the wheels out more to be left and right of your holding hand so the hand can sit in between. Just a though. Changes the formfactor a lot but makes it way more comfortable and ergonomic to draw.

[@maxvarjagen9810]

Lay both wheels flat on the same plane, so that the rotary force cancels itself out instead of pulling the bow down. Then attach a wooden bracket connecting the wheels from above to eliminate the strain and friction on the axles. This should also allow the string stopper to be made narrower, further reducing friction. Combine this with OP's suggestion of placing the handle in front of the wheels, and the end product should look and function like a bow with coils for arms. (with a perpendicular slingshot-style grip)

[@saml7610]

This design is actually very promising, but it needs some tweaks, and a couple add-ons. The first thing I'd go for is a wrist brace that grips the bottom of your wrist (I noticed serious downward recoil from the inertia of the spring wheels). The brace would distribute that force into your arm, which is waaaay more bouncy/force arresting than the body of the coilbow, so it can absorb the force. The second thing I'd go for is something like two or more arrow rests, one where you have it right now, and one on a rod that extends back from the pistol grip towards your elbow. Two (or three, optimally, to guarantee a smooth trajectory as it starts flying) arrow rests will guarantee the string doesn't fly up as it approaches it's resting position (which you can see in the slow motion). Third, I'd test different coil springs. The alloy you use for the springs, as well as the hardness/elastic properties the spring has can vary wildly depending on that. Trying different springs would undoubtedly yield extremely different results, specifically regarding the velocity at which the springs return to their resting state. Higher spring velocity should equal higher arrow velocity. Ideas for future iterations might include a spring that really decompresses quickly, but to compress would require a mechanical advantage (a block/tackle system). What if you could pull back the string, and lay the arrow onto a track guide that extends ~8 inches back from the pistol grip? That would be very effective, as it would stabilize the arrow, and it could have a locking lug that keeps the arrow in the "cocked" position. A crank that actuates a cocking bar would require the whole thing be a bit longer (1/2 the length of the arrow, I would assume), but this could be fine considering it's a "bullpup", which means as long as it doesn't go past the elbow, it's good. The bow release wouldn't even be a separate requirement at that point, it could be built into the trigger mechanism (admittedly, making the trigger more complex, since you'd essentially be building in the bow release). Now of course, this increases costs, and makes it harder to build, but I still think it would be very cool. Ultimately, food for thought. You've give me some ideas. I may try to build an improved version and then send you video of it in operation. I'd be honored to be included in a video or something, if I do end up doing that (my wife likely has other projects I need to work on, though). Very cool video though, I appreciate how innovative you are, it inspires me to try interesting things.

[@rickrouse7865]

10:53 "and it's entirely powered by..." PAIN

[@davidbell1619]

You never cease to amaze me with your ideas.

[@spencer963]

You're my favorite still living inventor, always love watching what you come up with. Brilliant designs

[@wompstopm123]

I built something similar. Its a spring bow like this but its a long garage door spring inside a housing that pulls a cable over a pully to push the arrow. When it fires it makes a starwars laser blaster sound from the spring retracting inside a metal tube and pushing the air out

[@paulgroth3345]

When you get it small enough that it fits under my left arm where I normally have my 45 I will be in the market for one. God bless you and keep you always inventing new things.

[@lady_draguliana784]

I have been fantasizing about a weapon of this type for years now... THANK YOU!

[@LordWout]

3:02 so true, I don't recall ever feeling so much agression from repairing anything else

[@ryansummers946]

Such a badass. A true legend at work. Always love seeing the child like happiness on his face.

[@zmishiymishi5349]

This is amazing. I literally cheered when arrow managed to bite in the target!

[@Bereft777]

The springs are considerably thicker on the lancehead, hence the need for block and tackle.

[@henrywilsonwinter]

I would pre-load the springs just a little so there’s force exerted on the arrow the whole time. Currently, by the time the arrow gets to the end of the mechanism, not much is propelling it besides momentum.

[@deadlymedley3306]

So awesome to see you make one of these! I finally made a useful discovery in this particular rabbit hole of diy crossbow making and that is you can shoot bolts through an enclosed barrel with just one rubbered fly wheel or a fly gear if you make gear bolts. I also found that string is non-helpful with these design because it's being pulled directly forward instead of outward and so it doesn't accelerate and bounce the arrow off the string like a trampoline like on a normal bowstring. I also found that design super thin, lightweight gears and having two torsion coils power one launch wheel improves efficiency by going from a twin to a mono assembly but once you start getting decent power then the issue is durability because light 3d printed gears eventually shatter from the sudden stop and so I gave up on gear bows for now lol but they are possible and cool but almost impossible to engineer a good one from home because it's like trying to do horology but at crossbow scale.

[@Pirateforliberty]

Jorge, I would put on a wrist stabilizing bar that goes both over, and under your wrist. When you draw and shoot your wrist is moving the arrow up and down. So the arrow goes into Archer's Paradox on release, and your wrist movement is exaggerating that movement. Nice compact design though. This one I think you should develop and market. A steel frame, composite covers, steel wheels, and you will have a wrist rocket on steroids.

[@JelMain]

As if the real thing wasn't banned already!

[@htomerif]

If you're willing to risk broken arms or fingers you could try cutting up a garage door spring and doing something with that. It also seems like you should be able to remove the temper from a regular leaf spring, twist it into a coil and temper it again to end up with something similar to what that crossbow has.

[@mattiamargini3688]

I would suggest to use ball bearings to reduce friction and put more momentum in the arrow

[@middleburgprepper2342]

That little thing is freaking awesome. These things are why I love the slingshot channel.

[@Capt_Caveman205]

Wow i think you really have the beginnings of something with that. Well done.

[@mrchithal]

I am from India ❤️

[@DriftedDreams]

I have a scar on my eyebrow from repairing a torsion spring. The retaining screw slipped its threads and the spring popped out with enough force to rip half my eyebrow off and tear the skin across the eye socket.

[@nfsfanAndrew]

Which is why I'm scared to death of springs and objects under pressure or tension. I watched a coworker break his hand on the garage door lift assist spring. And i had a tire explode on me while inflating it due to a bubble. Coworker thought it would be funny to add more air to it while i was working nearby.

[@DriftedDreams]

@@nfsfanAndrew yeah things under load and pressure are way more dangerous than people realise. I lost six months pay due to the damage to my face.

[@zeveris913]

This is awesome! If you added a lever in the handle on a ratchet you lock it and rest like a compound bow

[@California_Doge]

Reminds me of the Slingshots that you use to showcase back in the day. Amazing.

[@GUCR44]

Bloopers are a great addition... Love your vids.. You are an amazing person. Thank you. Rolf

[@reggiep75]

It's got a lot of scope for development and it's performance would increase with the right materials and improving on the issues that you're already aware of.

[@dennisjohansson5716]

Yeah man, I think youre on to something here, mr spraeve! Some really powerful springs and ots probably amazing! That crossbow sure had serious power...

[@Orangatangerine]

You could rig the whole front so that it has 1 rotating cylinder instead of 2, giving a huge space for springs. It might even accelerate the arrow some more as it would roll out of the release instead of sliding.

[@OperationDarkside]

I have a few suggestions for improvements: - Since the energy is not stored, the pistol grip puts more uneven strain on the hand than neccessary and you loose accuracy. Maybe put an axle through all the coils, so that the coils turn the axle and the axle turns the drums and you grip the axle. With a little offset between grip and axle you could balance it even more. It would make the grip a little thicker, though. In this config the arrow would accelerate very close to your arm, so you'd need arm protection! - To increase the draw length and therefore increase the power transmission phase, you could offset coils from its neighbor on each side. E.g. first the inner pair engages the axle, then the next outer pair and so on. This would require stronger coils, but would lend itself to learners or competitions, since you can change the coil package, but keep the rest the same. Having a custom grip can be really nice. - If you're super fancy, you could put a gearbox (e.g. planetary gear) inside, to replace the block and tackle.

[@Jfreek5050]

*GASP* You once said that using torsion springs wouldn't be very effective in a comment reply about this once. Idk what changed but glad to see this execution of this mechanic!

[@markwadsworth1254]

Could you use a planetary drive to increase the speed on your pulley and instead of a block and tackle system?

[@JelMain]

Set course for Gamma Centauri, Mr Spock.

[@matthewellisor5835]

I'm not into archery or slingshots (though I've put more than a few squirrels and rabbits on the table with a good old wrist rocket) but I do much enjoy machines. Really though, I'm here for your joyous laugh. Thanks for the smile today!

[@fyrrydr4g0n]

Lubrication of the springs and wood-on-wood joints and/ or making them out of harder wood might help the performance a bit. Also, YES BLOOPERS!

[@nathanaeltrimm2720]

What I’m hearing is “this can shoot heavier arrows but it will still be slow, if there was some sort of gearbox/block&tackle to change the slow power/high torque low speed to faster arrows with lower torque this design would be markedly improved upon”

[@reallyhightemplar4013]

So, improvements I can think for it, 1. As you mentioned, shorter, more powerful coils to make it stronger. 2. Now that you know your prototype is fully functional, maybe replace the wood knobs with carbon fiber. 3. I'd make the knobs just a little bit wider to give it more torque and also to raise the height of where the chord strings back through the weapon to it's firing position so as to make the pulling of the arrow straighter. 4. Maybe add a short extension to the "barrel" to stabilize the arrow. That's some nice work tho

[@sebbes333]

4:05 It's a freaking Pistol-Bow! :D

[@garethvila5108]

You always come up with really nice concepts, and this is no exception. You say it doesn't perform well, but I think it's pretty good for a proof of concept. There's some potential to it, and I'd really like to see an improved version.

[@oXblacknightXo]

Man fühlt einfach den Spaß mit dir. Sehr brillant gemacht. We love it

[@terminalpsychosis8022]

This spring tech, with the geometry and wheels of a compound bow, would be awesome.

[@billwendt9571]

Joerg, You're a GENIUS! I watched your channel for years and love all of your inventions & modifications. Keep up the good work.

[@haphazardprism]

I used to play with a slingshot when I was a kid, bought a daisy brand one a couple years ago after finding your videos. Now my friends think it's disgusting how accurate I got with it 😅

[@Alakazzam09]

I love the way your brain works Joerg. Really cool, sci-fi looking 'bow'.

[@Darkrider8893]

A collapsible or folding stock on the end that rests on your forearm might help with stability but also keep it compact.

[@ElHombreGato]

Hahahaha that reaction after the shot " Lame, but functional" hahahahaha my thoughts exactly! I love how Jorge is never afraid to make fun of himself! That's the definition of cool imo What is the cloud of pixie dust from in the slow motion shot?

[@kangarumpy]

This is just a slingshot. The lancer is just a really fancy slingshot. I will never unsee this.

[@dgundeadforge17]

Yay I'm happy my comment could have been read. If the coil crossbow company makes a pistol version it would be awesome. Just need an adder sized repeating bow with magazine.

[@jeffjefferson1143]

this man just completely reinvented the slingshot

[@thomandstacieverroad8417]

With bearings and better springs and obviously a more robust body you might have a real winner there!

[@Himbeer-Toni]

05:27 He builded it, it works, he like it. Innovations from the heart^^

[@MakoRuu]

Need to get some stronger springs, make the body out of aluminum, and add a slingshot style wrist brace. This is a great concept!

[@markfergerson2145]

I noticed counter torque rotating the whole device opposite to the mass of the springs during firing. If the spring drums were mounted horizontally so that they counter rotated to each other, this would not happen. It might not work any better but would look slightly more like a "real" crossbow.

[@angst_]

You should make a version with one spool on top of your hand, and the other one on the bottom of the grip. I think that would be more comfortable and less likely to twist your wrist. Position the spools either laying down flat aka co-linear. Or with them standing upright aka coplanar. Ideally the spools would be the same distance from your wrist and the rope should leave the pully as close to your wrist as possible to mitigate any twisting/pulling of your wrist.

[@Hfil66]

With regard to reducing the mass, it would seem that using wood for the rotors would seem somewhat extravagant, and you could use something like polycarbonate for the rotors. Certainly, using pulleys would be one way of gaining mechanical advantage, but you could also look at just using gears (cogs) to also provide mechanical advantage to allow a short action spring to operate on a long action bowstring.

[@moneyfornothing3264]

Very Nice Joerg! Thanks for showing us.

[@AnimeVampire234]

suggestion. maybe have the coils vertical instead of horizontal of the grip making it more into a traditional bow than a crossbow, this also would definitely improve it's stability and aim, and you may also be able to add in more coils. how it would look like is like.... dumbbells but the coils would be vertical so dumbbells but the weights being sideways, i think that would work very well as a mini compact bow. forgot to add that i guess you would need a brace of some sort to catch the string as it returns to it doesn't also hit your hand.

[@pypes84]

V2 you should make the winding drums with a conical path for the string so you get a variable take-up force / speed through the stroke.

[@teacon7]

What if you used the coiled springs as an aid to drawing a regular bow? Push forward into the springs, then let the springs release as you draw the real strings back. The speed of release wouldn't matter as much because it's not releasing the arrow so much as helping pull the string. And the compactness of the coils would be way better than the previous bow aids.

[@middleburgprepper2342]

You watch, he will be demonstrating it next year. New band-aids and all.

[@silentferret1049]

I kinda like the idea of this, almost a coil spring slingshot. Gearing and springs is key to it working properly. However they can be made and still be hand pulled. With the look I think it kinda looks like a Knuckle. I would call it the Knuckle Shot.

[@joshuamurphy7165]

Love watching your videos even when the inventions don't necessarily work as well as you'd hoped. In the end you almost always come up with an amazing new product! Thanks for your entertaining personality and creativity

[@SgtDreTecKeGamer]

WoW you can see the effort Joerg has to put in that little one-handed handheld Bow, good thing he has Big Muscles :))

[@bobbybologna3029]

Brooo this is genius, you need to put these in production, thats so cool

[@tatepishepard]

You are an awesome mad scientist. I love your unique way of thinking.

[@flx6470]

"well... lame but functional.." made me laugh so hard 😂

[@hanelyp1]

Another factor in a conventional bow, the changing angle of the bow string changes the leverage between bow and arrow. As the string straightens the bow limb moves slower relative to the arrow, moving some of the kinetic energy from the bow limbs to the arrow.

[@panchemist]

I love engineers! And i admire them! Back to being a chemist... and trying to tell the students - "go for engineering!"

[@JelMain]

ChemEng! Experiments with nitrogen, what a blast.🎣💣🎡🎆🌋

[@Briansawilddowner]

I love it! May be my favorite thing you’ve made so far.

[@4xdblack]

I'd love to see a combination of this with the Adder, along with your magazine technology.