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Problems with shoulder fired canon.

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: sniper hero » Mon Mar 31, 2008 8:32 am

ooo een 50mm lucht buks nee dan is het goed loop maar door en veel plezierXD :D
and yes I should your pvc strongermaking otherwise bangs it out eachother (sorry maar ik von dat ik engels nog wel wat nederlandser kon maken :D )

sorry for my (on purpose) bad english :wink:
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Unread postAuthor: Jared Haehnel » Mon Mar 31, 2008 8:34 am

Tom wrote:Thanks for the comments, I know my english is bad. But rather a good grammar then those stupid posts with alot of bad grammar. BTB I'm using pressure rated PVC pipe. I will dril a now hole for the projectile block to make the chamber bigger.
Tom


I'm sorry I guess I don't understand what you mean by that..."projectile block?"
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Unread postAuthor: Tom » Mon Mar 31, 2008 8:37 am

Is that sarcastic? :D
It's a bolt that prevents the projectile from rolling down in the chamber.
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Unread postAuthor: psycix » Mon Mar 31, 2008 8:43 am

Yup, just a bolt screwed through will do the job.

Where are you gonna place it? Halfway?
I would recommend to place it a bit behind halfway, so that it comes near a 0,8:1 C:B ratio
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Unread postAuthor: Jared Haehnel » Mon Mar 31, 2008 8:46 am

Oh, sorry I get it now, I'm a bit out of it today...stupid cold must have caught it from JSR... 8)

Why don't you just shorten the barrel?
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Unread postAuthor: Tom » Mon Mar 31, 2008 11:14 am

IT doesn't look anymore with a short barrel i think :D
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Unread postAuthor: Lentamentalisk » Mon Mar 31, 2008 12:02 pm

there is no point in "shortening the barrel" because the barrel and chamber are all one piece, just one long piece of pipe. What he is going to do is move the projectile block up some, so that the C:B ratio is better
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Unread postAuthor: Tom » Tue Apr 01, 2008 9:44 am

Today I have tested IT :D . It works very well, better than I thought it would do. I don't know how far it shoots, but it's very loud(and thats is very important :) . Thanks for all the help
Tom
PS: I will post the pics in the launchers section soon.
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Unread postAuthor: McFear » Thu Apr 03, 2008 6:39 am

Tom wrote:Today I have tested IT :D . It works very well, better than I thought it would do. I don't know how far it shoots, but it's very loud(and thats is very important :) . Thanks for all the help
Tom
PS: I will post the pics in the launchers section soon.


you should hear mine, lol. its a 6.28L combustion chamber running into a 2m long 65m barrel. it shot a tennis ball at about 625km/h. through a 4 inch foam pillow, through a milk crate and then finally through 1/2 inch mdf wood. lol its a nice one. melts the tennis balls though so they only last about 5 - 10 shots if you dont lose it before that.

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Unread postAuthor: Brian the brain » Thu Apr 03, 2008 7:14 am

Sounds nice.But especially for combustions the golden rule = noise is wasted energy.
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Unread postAuthor: McFear » Thu Apr 03, 2008 7:23 am

meh, it still shoots a tennis ball heaps far. distance shot at a 5 degree angle to the parallel into a slight head wind was 180m. i have that on video. i also have a vid of it shooting through half inch wood.

lol. noise may be wasted energy, but it makes up for it with fun. :P

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