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small breech loading gun mounted on homemade tank

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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small breech loading gun mounted on homemade tank

Unread postAuthor: Runningman5 » Tue May 31, 2011 1:20 am

[youtube] http://www.youtube.com/watch?v=v-TSLmWTFq0

After searching the internet and not finding what I wanted; I built this cannon for the tank I am putting together. Has anyone seen anything like this? this is the first prototype that I put together and I was wondering about upgrades. more videos once I build some ammo.[/youtube]
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Unread postAuthor: Doctore » Tue May 31, 2011 5:09 am

Looks good :D

What about range?And if you can post pictures of your tank when you finish it.
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Unread postAuthor: Labtecpower » Tue May 31, 2011 8:27 am

[youtube]http://www.youtube.com/watch?v=v-TSLmWTFq0[/youtube]

Nice :) I like the tank style 360 degree travel.

I see you use propane as propellant. Do you meter it ?

Also, according to other members, adding a chamber fan will increase performance noticeably. It will probably have trouble with your loading system however.
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Unread postAuthor: wyz2285 » Tue May 31, 2011 1:11 pm

I have a friend that's buiding the same thing but he uses hydrogen and automatic reload. Any way very nice :)
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Unread postAuthor: cammyd32 » Tue May 31, 2011 1:19 pm

That is painfully epic. I look forward too seeing it when it is finished. :D
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Unread postAuthor: pipeboyswe » Tue May 31, 2011 1:58 pm

Wow that looks awesome! What are the specs of the gun? barrel length etc, etc.
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Unread postAuthor: Runningman5 » Tue May 31, 2011 6:52 pm

the barrel is a 2inch piece that's 44inches long. it's volume is about 1-1 with the combustion chamber. I have heard that the ideal ratio is 1.5-1, but I have been getting more than enough power with the current barrel. just the other day I launched a lemon at least 180yds uphill (not entirely sure cause I couldn't see the landing point).
the Propane has a one-way valve attached going into the combustion chamber, had to build it myself. for the breach I used a threaded end cap and cut off about half of the threads and ground down the rest. the whole door assembly is something I welded up. the ignitor is a rewired stun gun (fairly easy to do, but make sure everything is properly insulated!!!)

Pics and more vids soon
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Unread postAuthor: Runningman5 » Tue May 31, 2011 8:50 pm

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Unread postAuthor: warhead052 » Wed Jun 01, 2011 9:28 am

If thats an airsoft tank, I would suggest NOT using that ammo. Just for safety reasons. Just try a paper towel wadding, then bbs and then more paper towels. Then fire away.
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Unread postAuthor: cammyd32 » Wed Jun 01, 2011 9:49 am

That is a point, if you hit someone with that not only will it get them out, it will knock them out.
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Unread postAuthor: warhead052 » Wed Jun 01, 2011 9:52 am

Since it goes through plywood, it will kill them. Unless its a 2liter bottle airburst shell, I don't think its safe to use.
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Unread postAuthor: Runningman5 » Wed Jun 01, 2011 2:50 pm

Yeah, I kind of figured that something that could put a nice round hole in plywood is not something that I want to shoot at people. considering the power that I am getting I don't want to shoot anything at anyone with this gun. I may try making a lower power version; with a 3inch combustion chamber or something. in the meantime I will just attach one of my airsoft rifles, that was the original idea anyway. Definitely going to keep the cannon for messing around though.
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Unread postAuthor: warhead052 » Wed Jun 01, 2011 2:59 pm

Well, using a nerf football or something would work, but be sure to tell everyone to watch out for it. Call a 30 foot radius "kill" zone or something for the foot ball.
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Unread postAuthor: Runningman5 » Wed Jun 01, 2011 5:56 pm

for target practice I marked out a 15ft circle around the plywood, it was a pretty big circle. from 150ft I was able to get 2/3 shots inside the circle, so 30ft might be a bit too much. I am hesitant to try nerf footballs because of the price, anyone know where I could buy them in bulk? otherwise they're like $8 each
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Unread postAuthor: warhead052 » Wed Jun 01, 2011 6:06 pm

Try ebay, or try the paper towels and bb rounds.
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