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KUHFIB (Now with video of FEAR firing a 10x mix)

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: DYI » Fri Jul 11, 2008 9:45 pm

I'll likely make it to about 70k ft/lbs this summer, all going well. 100,000 should be impressive, but the extra-long barrel might make it even more of a pain to shoot than my launchers. I guess my designs trade size for foil consumption - I'll need a 512 layer disk for full power shots :roll:

Have you fixed the firing valve problem that caused the "backwards recoil"?

Any idea what sabot material you'll be using for the tungsten dart? Tape just doesn't cut it for hybrids, I've found that out myself. I'm also a bit worried about your barrel; properly reinforced, it will take the pressure, but I've noticed another rather disconcerting effect on my reinforced ABS barrel - it is literally melting on high mix shots, and deforming severly when it does so. It seems like this effect is also thinning it at the breach side and causing deposits of solidified plastic inside the barrel which could interfere with projectiles' sealing capabilities on the way out.

Good luck on this build, I hope you get some cool damage pics out of it and no more drill bits driven into your fingers :P
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Unread postAuthor: Killjoy » Fri Jul 11, 2008 10:41 pm

Yeah but by isolating the sensitive components from the cannon and spraying painting everything, I should be able to store this thing outside, and the stand I'm designing is made to be fully mobile.

Thats a lot of foil you need there, maybe sheet metal would be worth a look.

The dart and sabot are designed like the armor piercing rounds the m1a1 Abrams tanks use. The sabot will be a combination of pvc pieces and foam and will fall away once the projectile exits the barrel (the dart is 3/4" in diameter and fin stabilized).

I feared that might happen but I wasn't sure. Now that you have confirmed my suspicions though, I think I'll opt for my secondary design in which the first 10 feet is 4" shc40 steel pipe and the rest is ABS pipe. I'm glad you mentioned that though.

Haha thanks, I'll to keep those pesky drillbits out of my body.
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Unread postAuthor: blind909 » Fri Jul 11, 2008 11:25 pm

MrCrowley wrote:
blind909 wrote:I typed it in on google and it came up with Dichloro-Diphenyl-Trichloroethane, which is a common pesticide.

A quick search of 'DDT' in the Spudwiki came up with this:
http://www.spudfiles.com/spud_wiki/index.php?title=DDT


I'm sensing a strong magnetic field pulling me towards the irony of your signature :roll:

Edit: Oh yeah and awesome job Killjoy. You make me proud to belong to the same forum as you do :D :wink:



I forgot about spudwiki, I searched the search engine in my sig, and there was 6 pages, and none of them really defined DDT.
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Unread postAuthor: biggsauce » Sat Jul 12, 2008 10:08 pm

Don't intend to hi-jack your thread, but I saw there was some interest in solenoid vavles and I thought some people might want to see this sight for affordable valves.

http://airbagit.com/product_info.php?products_id=1658


I just love The Box. Great idea and great job, I'll have to make a version for myself 8)
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Unread postAuthor: McFear » Sun Aug 03, 2008 4:10 am

would you be interested in selling them?

im in aus tho. could be an issue.

or at least send me the plans for all of your wiring. lol

im hopeless at making electronic stuff from scratch. i can make it once i know what to do, but figuring all this out, like what you need to wire it up and all this is just something i never got.

nice box mate.

Fear
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Unread postAuthor: Killjoy » Sun Aug 03, 2008 4:38 am

Nope lol. Way to much work and effort for me. Even if I did, considering the amount of time it took and the amount of money I could have made during the same amount of time doing other stuff, I would be forced to charge probably about 600 bucks for this (a combination of materials and man hours). So it would definitely be cheaper to work one out on your own.

The wiring is actually the simplest part. It's just basic electrical with switches, batteries, and valves. I could explain it in words, but a picture would be quicker. I'll try and work one out for you in the next couple days. Mind you this is much more complicated then it has to be, gauges and ball valves will get you the same results much easier and cheaper.

And I might consider doing a how-to eventually too, since this does make hybrid fueling much, much easier and the concept seems to draw a lot of interest.
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