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!

Step 1: Startup

This is the challenge I set to myself:

Build a rubber band powered device using rollerblade wheels and a reclaimed drum from a plane, capable to shoot regular carbon arrows at least as powerful as a 50-pound compound bow.


Use as much as wood & metal you can.

Why rubber bands? Because they are compact & powerful.
Why rollerblade wheels? Because they are ball bearinged. And cool.
Why that drum from a woodworking plane? Because it's a cool device, also, that's been waiting for years in my workshop to be used.
Why wood & metal? Because I don't like the actual abondant use and mis-use of composite materials. Back to good old basics.

Really like it mate, thanks for the great ideas. I'm going to upgrade my crossbow. Cheers
<p>Thanx, let me know how the upgrade turned out!</p>
can you explain his plane part? like we're would I find kne as a spare part online. ?
<p>Good question, better ask a furnisher in woodworking tools where they send their machines to repair - they always have a post-sale service. Good luck!</p>
<p>There can you find aluminum plates and bars? I look for stuff where I can, and when I can. Do you have any tips?</p>
<p>Try to find machine factories in your region. Often they've got large bins with nice scrap material. Most of the time it's sold to be recycled but if you ask it friendly you might get away with some good stuff.</p>
<p>hi, nice work!</p><p>about the trigger being a bit hard with big tensions, it could be wise to use the old ways... a trigger such as the one on the pic that follows... the longer the trigger, the more power to trigger...</p><p>have fun!</p>
<p>why I pad</p>
Ipad = Insanely Powerful Arrow Driver
<p>Know the difference between a weapon and a tool? The person behind it. Don't listen to the people calling it &quot;inappropriate&quot;. Some folks just see the negative side of everything. It's some fine work, you did there, on a very clever tool.</p>
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.
<p>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.</p>
<p>Absolutely incredible!</p>
<p>Why I pad</p>
<p>Because the name <strong>Llanfair&shy;pwllgwyngyll&shy;gogery&shy;chwyrn&shy;drobwll&shy;llan&shy;tysilio&shy;gogo&shy;goch</strong> was already taken.</p>
Ahh, youth! Those heady days of alcohol and powerful pointy projectiles. Sigh...
<p>That's why growing up is such a pain...</p>
<p>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.</p>
<p>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!</p>
<p>Real weapon instructables shouldn't be posted here. This is highly inappropriate.</p>
<p>Very Cool and wicked!......</p>
<p>Just a tiny little bit...!</p>
<p>cool job ,,I like the fact there is no limbs to watch out for if your hunting in deep woods </p>
<p>An instructable which endorses cruelty to animals should not be featured in the newsletter.</p>
<p>Reads more like early child abuse to the guy to me. And a scarey weapon.</p>
<p>Well that was ignorant. I don't see anywhere in this post that he endorses any kind of cruelty to animals. You might need to re-read</p>
<p>Pussy pies are nice....</p>
<p>hey winey go back to moma's bosom ! I seen no such endorsement to hurting any pets ok,,,it is up to the one that uses the device ,,,, such as a slim jim can get your key out of your lock car as well as in the hands of a crook it can get your car robed of every thing inside the car </p>
<p>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.</p><p>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.</p>
<p>Maybe try surgical tubing. That stuff works really well with wrist-rockets. But a really cool weapon nonetheless.</p>
<p>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?</p>
<p>Reminds me of the Robert Blair &quot;ComBow&quot; 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.</p><p><a href="http://www.combowslingguy.com/" rel="nofollow">http://www.combowslingguy.com/</a></p>
<p>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?</p>
<p>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 &quot;the basement of the Alamo&quot;, its not something they teach you in school. Loved the writing. Your humor and mine are quite similar.</p>
<p>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.</p>
<p>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. </p>
<p>Thanx, I'm looking forward to that amazing project of yours!</p>
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!
<p>Overkill? Where did you see that?! ;)</p>
<p>That's really epic! I was planning to make something similar as a weapon for steampunk larp.</p>
<p>Wanna see that! Good luck with the build!</p>
<p>&quot;Resistant like ... the skin of married men&quot;? Oh, if it's not it will be! </p><p>Great comment. Thought you'd slip that by and no one would notice, eh? </p>
<p>I forgot I wrote that! The quote was too evil to keep it just for myself! ;)</p>
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
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 :/
Ditto googling<br>set triggers<br>Trigger sears<br><br>For development<br>REMOTE drawing / cocking<br>REMOTE release<br>To avoid a Darwin Award or high medical cost &amp; permanent disability.<br><br>Reduce sheave mass, machine material to act as string guide on just the bearings.<br><br>Google<br>block &amp; tackle<br>Costruct miniature block &amp; 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 &amp; driving force continuous. Bow string materials and construction techniques are available online. <br><br>You may want to look at performance of most powerful production crossbow, as I recall very impressive. <br>Know that arrow accuracy becomes terrible with increase of distance compared to firearms.<br><br>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.

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Bio: I made a beer mug with only a knife & a hatchet. I think that says a lot about me.
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