Posted: Sat Sep 12, 2009 12:13 pm
you should check your local ace or whatever you have too. the ace by me has stuff up to 4 inch, and the lowes and homedepot dont have anything over 2.
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Posted: Fri Oct 02, 2009 10:03 pm
okay i didnt read all of the comments but if you had access to a lathe you could use UHMW or some kind of polyethylene, possibly even teflon to make a piston. just a suggestion, i've made one out of UHMW before.
Posted: Fri Oct 02, 2009 10:09 pm
yea ive moved on to bigger better things, linky
http://www.spudfiles.com/forums/northir ... 19318.html
http://www.spudfiles.com/forums/northir ... 19318.html
Posted: Fri Oct 02, 2009 10:11 pm
ohhhhh! veryy niczzze GB cannon! Is good!
Posted: Fri Oct 02, 2009 10:21 pm
yea im quite proud of it i got the volume down now to where the cannon doesnt lose power but has less of a bang
Posted: Fri Oct 02, 2009 10:28 pm
nice man. and yea, that always seems to be the compromise when it comes to tweaking the volume.
Posted: Sat Oct 03, 2009 5:14 am
working on making the combustion run on propane, but i think my #s are off, http://www.burntlatke.com/ft_live.html says ill need 20" of 1" pipe for my meter, or 24" of 3/4'' pipe, the chamber is 3" abs by 24"
Posted: Sat Oct 03, 2009 5:54 am
It does sound a bit off, this is what I got:Northir wrote:working on making the combustion run on propane, but i think my #s are off, http://www.burntlatke.com/ft_live.html says ill need 20" of 1" pipe for my meter, or 24" of 3/4'' pipe, the chamber is 3" abs by 24"
Posted: Sat Oct 03, 2009 11:13 am
yea a 20" length of 1" pvc seems a little big for metering propane. i made a combustion tennis ball cannon with a 4 x 18" chamber and if i remember correctly, i think my meter pipe was, er, like maybe 6" long and 1/2" diameter.
Posted: Sun Oct 04, 2009 8:28 am
i guess i should have noted my tank is 50 psi not 90, either that or my pressure gauge is borked
Posted: Sun Oct 04, 2009 8:59 am
In that case pressure is about half, so the length of the metre pipe approximately doubles.Northir wrote:i guess i should have noted my tank is 50 psi not 90, either that or my pressure gauge is borked
Posted: Sun Oct 04, 2009 11:24 am
oh, before i forget, has anyone every tried using acetylene gas instead of propane? I have an oxy-gas welding torch and just thought of trying it. 
Posted: Sun Oct 04, 2009 11:36 am
Typing "acetylene" into the search button would have answered your question, use it 
Posted: Sun Oct 04, 2009 11:56 am
That is the search button, not acetylene
Posted: Sun Oct 04, 2009 11:58 am
Most poignant clarification, cheersal-xg wrote:That is the search button, not acetylene