Pimpin' advanced combustion.

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
User avatar
chartreusesnot
Specialist
Specialist
Posts: 109
Joined: Tue Jun 05, 2007 11:52 pm

Sat Feb 23, 2008 10:35 pm

This is my second real cannon, and my first combustion. It is an advanced combustion with all the works including a chamber fan, and metered propane. Propane is hard to work with in small chamber volumes such as this, ~375 cc. This is why a meter is critical, so that the propane volume falls within the golden ratio range. ~2.4% - 9.2%. I calculated the pressure for the meter to be around 20 psi. Pretty much all of the information, along with the general design, were found at burntlatke's site. I have fired it a few times, and from what I can see, it is quite powerful. I will take a video at some point. Probably tomorrow.

EDIT 1: Video
Attachments
The propane meter.
The propane meter.
chamber fan, smallest one at radioshack.
chamber fan, smallest one at radioshack.
regulator with propane adapter
regulator with propane adapter
angle shot showing trigger
angle shot showing trigger
chamber
chamber
Full view
Full view
Size comparison
Size comparison
Last edited by chartreusesnot on Sun Feb 24, 2008 6:42 pm, edited 2 times in total.
_Fnord wrote:OMG you have broked teh universe!!!11exclamationpoint!1!




^^^^CLICK^^^^
User avatar
Sergeant Dotson
Specialist
Specialist
Posts: 149
Joined: Mon Jan 21, 2008 5:53 pm
Location: Tennessee

Sat Feb 23, 2008 10:41 pm

Very nice! I like the design and idea. Keep up the good work! Now all you need to do is paint it, maybe a poll for different colors?
User avatar
chartreusesnot
Specialist
Specialist
Posts: 109
Joined: Tue Jun 05, 2007 11:52 pm

Sun Feb 24, 2008 6:41 pm

Heres the first video in crappy lighting due to a rainy day.
_Fnord wrote:OMG you have broked teh universe!!!11exclamationpoint!1!




^^^^CLICK^^^^
User avatar
STHORNE
Sergeant 3
Sergeant 3
Posts: 1208
Joined: Wed Feb 14, 2007 7:50 pm
Location: Kewaunee, Wisconsin

Donating Members

Sun Feb 24, 2008 7:42 pm

you should put a ball valve (or 2) in your propane meter set up for more accurate propane use, but other than that.....

JOB WELL DONE!!! :D


EDIT: oops, my bad, hard to see the ball valves with the skinny handles.
Last edited by STHORNE on Sun Feb 24, 2008 8:44 pm, edited 1 time in total.
e1337
Specialist
Specialist
Posts: 110
Joined: Mon May 28, 2007 8:00 pm
Location: Florida

Sun Feb 24, 2008 8:09 pm

There are ball valves as far as I can tell
User avatar
chartreusesnot
Specialist
Specialist
Posts: 109
Joined: Tue Jun 05, 2007 11:52 pm

Sun Feb 24, 2008 8:16 pm

they are the small brass pieces on either side of the gauge.
_Fnord wrote:OMG you have broked teh universe!!!11exclamationpoint!1!




^^^^CLICK^^^^
User avatar
bigbob12345
Staff Sergeant
Staff Sergeant
Posts: 1516
Joined: Sat Dec 01, 2007 9:13 am
Location: Mercer Island,Washington

Sun Feb 24, 2008 8:23 pm

Nice job im planning to make one similar after I save up some money.
Post Reply