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New pics of my almost done gun.

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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New pics of my almost done gun.

Unread postAuthor: wangpushups » Tue Nov 06, 2007 4:58 pm

Image

What do you guys think about the support block and the gun so far?
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Unread postAuthor: Pete Zaria » Tue Nov 06, 2007 5:08 pm

I think your support system will work just fine. I'd consider using a pipe saddle instead of the T connected to the ball valve, but your idea will be fine too.

If you're going to go to all the trouble of double-sleeving your whole chamber, don't leave gaps for the metal straps; those gaps will create weak points (compared to the rest of it). Instead, sleeve the whole thing, and then using a file (or dremel, or even sandpaper) create shallow grooves for the pipe clamps - it doesn't take much of a groove at all to keep them from moving around.
I like your idea for cutting slits in the handle T's for the metal straps to go through - I might emulate this myself, if you don't mind. Hell, I'll probably do it even if you do, but I'll be nice and ask anyway :D

Are you going to use metered propane? Where are you going to mount the tank?

My last comment, consider using 2" elbows from the chamber to the barrel, for less choked flow. Also would allow you do to a pass-through style barrel.

Peace,
Pete Zaria.
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Unread postAuthor: ShowNoMercy » Tue Nov 06, 2007 5:12 pm

Why even cut grooves? Wont hose clamps have enough friction to prevent twisting?
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Unread postAuthor: potatoflinger » Tue Nov 06, 2007 5:34 pm

The slit through the tee connector for the hose clamp works pretty well, I used one of the barrel supports on a paintball gun, and it didn't move a bit.
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Unread postAuthor: wangpushups » Tue Nov 06, 2007 8:47 pm

Well its too late now for putting on 2" elbos but im sure it'll work perfect as it is already. The further the support block is down towards the barrel, the better the support will be and it wont be flimsy when shooting either. I was going to put the support before the ball valve but then i would have more chamber volume and what i have right now is perfect, a 6 foot long barrel = 149.5 cu. in., and a chamber = 163.23 cu. in., which leaves me with a 1.09:1 ratio which is perfect cause i would hate to have such a long barrel especially since i have a car for transporting it.
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Unread postAuthor: wangpushups » Tue Nov 06, 2007 8:54 pm

I have a stun gun ignition incased in a project box, copper clad spark strip, a 12 V. fan, it's propane injected (w/ regulator), laser sight, and a meter w/ guage. It's a very clean looking gun so far, i have all the wires concealed with the black corrigated tubing. I'll have the gun pics and damage pics ready in a couple days.
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Unread postAuthor: wangpushups » Tue Nov 06, 2007 8:57 pm

A question about the elbos, it shouldnt be that big of a deal that i have
1 1/2" instead of 2" right? Because that would suck if i had to cut it off and replace it with 2" because of the airflow.
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Unread postAuthor: wangpushups » Tue Nov 06, 2007 9:01 pm

The back handle is the spark ignition and the front handle is for the laser sight, any suggestions as to where i should mount the laser? I was thinking the bottom of the bottom support tee? I dont know?
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Unread postAuthor: sandman » Tue Nov 06, 2007 9:48 pm

a quadruple post is just unnecessary

but to answer the laser question, you would want it as close to barrel as possible
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Unread postAuthor: wangpushups » Tue Nov 06, 2007 9:58 pm

Unnecessary posting? I didn't know there was such a thing...
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Unread postAuthor: sandman » Tue Nov 06, 2007 10:24 pm

there is an edit button for a reason :wink:

all of that could have been condensed into one post
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Unread postAuthor: psycix » Wed Nov 07, 2007 5:32 am

wangpushups wrote:Unnecessary posting? I didn't know there was such a thing...


People dont like it if you post multiple times in a row.

Use the edit button instead if you want to add something later on.


Double (or more) posting is hated.
Editing is respected.
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Unread postAuthor: wangpushups » Wed Nov 07, 2007 8:53 am

Sure thing...so i'm kinda scared about my 1 1/2" elbos now. Is there gonna be a problem if i have it this way, like my performance, or the gun blowing up or something? I really need this question answered.
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