I built my first heavy crossbow when I was about 13 years old. It was a quite powerful device, powered by a rubber sling - a 10mm O-ring I just 'found' on a public worksite - and armed with custom wooden darts. Steel heads, explosive heads, too dangerous heads - in the hands of a small me. I'm sure the holes are still in the steel garage door of my parents.
No wonder that one of the first skills I learned was changing glass windows. Rapidly. Invisible. I became a pro.

My crossbows were a great source of pleasure in my youth.
And of cave arrest, also. Too bad - for my parents - there was a lot of beer stored in that cave, also.
That's how, for the first time, I got insanely drunk.
Resulting in more cave arrest, my hands powertaped. And the company of the neighbours dog to keep an eye on me.
Sweet youth souvenirs...

Resuming: in my youth I learned to love crossbows, I learned to love beer, I discovered the resistance of duct tape and I started to hate dogs. JUST KIDDING!!!
More than 20 years later I'm still on bows, crossbows & slingshot stuff. Target shooting. Long range. 'Run, doggy, run!'.
Since the 80's I've built six arrow-shooting devices. This is number 7, I guess.

But today I see things a lot bigger. Crossbow's Revenge.

This project is about building a real heavy powerful 'badass' scorpio-style arrow shooter. It's not a crossbow, not a speargun, not a scorpio and it's definitely not a slingshot. It's a prototype.
My wife calls it 'That Heavy Thing That Keeps On Hanging Around In The House'.

I built it gradually. 'Sometimes it's good to look at your work' a member said once. That's also what I told my wife because that's exactly how I build this weapon. It all started with a piece of wood and some scrap metal I had to integrate in the project.
In other words: I got the ingedrients, but no idea of the meal I was going to prepare.
Experimental building.

This instructable isn't about howto, it's about custom made hardware. I'm not going to explain how to work wood & metal.
I'm giving you the plans of each device. Your job to make it. Or to improve it. Open source.
Download the plans (click on the pictures & get access to the original files). No CAD-stuff - I'm an old school guy...

Total length (winch included): 128 cm (4 feet) - look at those kitties to compare!
Max. widht: 21 cm (2/3 foot)
Total weight: too much

This IPAD is made of  12 components:
- stock
- drum
- trigger
- trigger rod
- trigger protection
- 'double decker' aka roller device
- stirrup
- lock
- winch
- driver
- sling
- sight

One step, one component. Let's have a look at all those pieces!
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datsun720br18 days ago
can you explain his plane part? like we're would I find kne as a spare part online. ?
tincatinca2 months ago

why I pad

Ipad = Insanely Powerful Arrow Driver
antagonizer2 months ago

Know the difference between a weapon and a tool? The person behind it. Don't listen to the people calling it "inappropriate". Some folks just see the negative side of everything. It's some fine work, you did there, on a very clever tool.

Couldn't have put it better myself, seems like some people are simply just born without childlike wonder, an engineers spirit or the satisfaction of a project well made.
bricobart (author)  antagonizer2 months ago

If I should have listened to that too-careful-to-live-minority I'd probably dead by boredom by now... Thanx for your support my friend, we're definitely on the same side of the fish bowl.

wdesilvey2 months ago

Absolutely incredible!

Gunter1872 months ago


tincatinca2 months ago

Why I pad

bricobart (author)  tincatinca2 months ago

Because the name Llanfair­pwllgwyngyll­gogery­chwyrn­drobwll­llan­tysilio­gogo­goch was already taken.

Uncle Kudzu2 months ago
Ahh, youth! Those heady days of alcohol and powerful pointy projectiles. Sigh...
bricobart (author)  Uncle Kudzu2 months ago

That's why growing up is such a pain...

bgepp12 months ago

this is so sweet I think I just got a cavity. This looks like an M1 Garand and a medieval crossbow had a baby. I love this - although it may be a bit challenging for me personally to build I am happy someone was able to create this. awesome dude. Please post a POV video if you can.

bricobart (author)  bgepp12 months ago

Hey thanx man, I never saw it that way but that's just a wonderful comparison you made there! I'll try to mount the camera on it to get a real decent video, sounds challenging!

billbillt2 months ago

Very Cool and wicked!......

bricobart (author)  billbillt2 months ago

Just a tiny little bit...!

Fred826642 months ago

cool job ,,I like the fact there is no limbs to watch out for if your hunting in deep woods

EmmettO2 months ago

I would think that the rollers should only convey the string. Make the rubber tubes attach further back, and you could have six of them (three on each side). Then only the string is conveyed by the rollers. It would allow more power bands to be added.

It would also enable you to put guards around the power bands so that if they snap, they won't snap back and hit the firer.

blueaxe2 months ago

Maybe try surgical tubing. That stuff works really well with wrist-rockets. But a really cool weapon nonetheless.

ccguelph2 months ago

Hey, was planning on making something shockingly similar myself this summer, so thanks for hopefully taking a little of the trial and error out of the design process for me lol. The only difference in my idea is that I was hoping to make something as versatile as possible, so wanted it to be able to launch bbs or even small pebbles. I was wondering if you thought it would be possible to have the bow string easily swapped out with a similar string with a tiny slingshot cup strung between?

ardrhi2 months ago

Reminds me of the Robert Blair "ComBow" from the early 80's. I actually met this guy once, and he showed me this cool ultra-powerful arrow-firing compound slingshot. It was to the wrist rocket what your gadget is to a carbine.


astrong02 months ago

Interesting concept for the sliding trigger/sear design. Why did you chose to do that? why not model it after a rifle trigger, certainly not with all of the tight tolerances but just a simple trigger sear combo straight into the drum?

burnerjack012 months ago

VERY cool. One note of caution though: Beware of 'sling failure' while sighting. Had a near brush with blindness while cranking on a slingshot in my youth. Like "the basement of the Alamo", its not something they teach you in school. Loved the writing. Your humor and mine are quite similar.

acoleman32 months ago

i wonder if a person could make the stock from aluminium rectangular tubing. only for the fact that it's more rigid and a lot lighter. major downsides are it's more expensive and creates further complications on how to mount the mechanisms and shite. oh yes, nice choice using metric measurements. the imperial system is total crap hahaha. another thing, i think a windlass would make arming the device faster than a ratchet mechanism, without making it harder. after all, many of the ancient crossbows used them.

Attmos9 months ago

Very well written instructable on a very cool project. I'm researching ideas and methods for a project I'm working on. Thanks for the great detail, you've given me some new directions to think about.

bricobart (author)  Attmos9 months ago

Thanx, I'm looking forward to that amazing project of yours!

Amazing drawings, some of the best documentation I've seen yet on this site. And I love the amount of overkill: it's just ridiculous!
bricobart (author)  Speffeddude9 months ago

Overkill? Where did you see that?! ;)

Eldalote1 year ago

That's really epic! I was planning to make something similar as a weapon for steampunk larp.

bricobart (author)  Eldalote1 year ago

Wanna see that! Good luck with the build!

Eh Lie Us!1 year ago

"Resistant like ... the skin of married men"? Oh, if it's not it will be!

Great comment. Thought you'd slip that by and no one would notice, eh?

bricobart (author)  Eh Lie Us!1 year ago

I forgot I wrote that! The quote was too evil to keep it just for myself! ;)

Hey, this is really cool in fact its so coll it inspired me to make my own crossbow (no elastic) ibwas wondering if i could use your idea of a ratchet tie down (i assume thats what it is) winch in my own ible? I would of course give credit
bricobart (author)  Pokemon_Trainer_Dan1 year ago
That's cool mate! No need to give any credits, the idea of instructables is to share that knowledge. Looking forward to see that project!
Please excuse the typos im on my phone :/
DaveB131 year ago
Ditto googling
set triggers
Trigger sears

For development
REMOTE drawing / cocking
REMOTE release
To avoid a Darwin Award or high medical cost & permanent disability.

Reduce sheave mass, machine material to act as string guide on just the bearings.

block & tackle
Costruct miniature block & tackle so drive spring ( rubber or steel or air ) movement is small so inertia is small and arrow drive distance is as large as you want it. You may want to incorporate a cam to have draw & driving force continuous. Bow string materials and construction techniques are available online.

You may want to look at performance of most powerful production crossbow, as I recall very impressive.
Know that arrow accuracy becomes terrible with increase of distance compared to firearms.

Even with considerable safety factor built of power reduced from just below a loading factor that causes failure. Firing without an arrow will almost certainly break something.

Ipad.... I think that's great! It's the only kind of Ipad that will be working after the supposed TEOTWAWKI.... ;-}

bricobart (author)  keverett4584291 year ago

That's the spirit! IPAD 7 is build to resist and to last. Technology Won't Save Us, anyway... ;)

Quester551 year ago

A great idea, I to built my first (and last) HD Crossbow out of an old Leaf Spring from my dad's old Round bale maker & Piano Wire-cable, Plus one R/R Jack to cock it. & a 1" gas pipe for the main stock, For Arrows/Bolts, I used ground down Carbide Runners for Snowmobiles, With Welded Triangle Hay-more blades for the Arrow head.

However my dad found out & would let me fire it once before Chopping it to bits with his torch!

I can tell you, the arrow cracked a Flat Head on an old Dodge Truck engine, befor shaddering into a million pieces.

Good Luck with yours.

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