sorry ive been sick the past 2 days and havnt been able to do much. but i did try it out a few minutes ago and it worked fine. i tested a 100 psi and i opened it slowly and the potato didnt explode. but air did leak from between the valve walls and the potato.

hmm i was just lookin in the garage the other day and i came across 3 1.5" sprinkler valves and 2 2" sprinkler valves so im stoked haha. im plannin on a water balloon mortar for one of the 2" valves.

maybe in propulsion. you have more air capacity so the projectile will travel farther. but 100 psi on a potato is 100psi. and i just need a small potato

well i have em both so i compare em regardless of price. and the whisper really isnt that much quieter. there is almost no noise from the air being released but the piston hitting metal is still pretty loud. and the whisper is much lighter.

partyars: that gun was built over a year ago... now he has a very nicely built small caliber rifle. i dont even think that this cannon is in one piece anymore haha.

his nice cannon
http://www.youtube.com/watch?v=8YjA6nZzXMg

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3/4 inch pipe. 1/4 inch fill valve. why?

ok so i just built the test cannon. it is probably the 2nd worst cannon i have ever built (the first didnt last more than 5 minutes before i took it apart again) im just waiting for the cement to dry and i will test it soon http://i279.photobucket.com/albums/kk124/mateo710/Photo07251855.jpg [/img] e...

ok well i think i have some spare parts layin around... ill go make one but im very skeptical if it will work or not...

hm my little brother bought one of these and also a gamo whisper. id have to say the gamo is much more powerful but i do like the feel of the crossman. personally im not into breaking the barrel every shot so i have one of these :lol: http://www.crosman.com/airguns/rifles/co2/1077 i give up some vel...

we should break out the measuring thingys (sorry but the name is totally slipping my mind right now... those things that measure the velocity of the projectile?) and then we will see if its anymore efficient


edit: chronometer!!!! ahah i got it!

wow colty seems to be the king of ghetto haha. i actually have been slowly collecting parts to make a rifle with this kind of design too... who knows if ill ever get around to makin it...

umm pics? and some video proof please. also did you end up usin the shuttle idea or butterfly idea?

well if you feel the need to "machine" a piston then go buy a dowel rod from a hardware store and start workin at it wish some sand paper. but really you dont need to machine a piston. and that whole giant ball valve breach/confusion thing really is way more complex than a sprinkler which is plenty ...

You should add a pvc chamber so you can pressurize to higher pressures without blowing yourself up. hes quite an experienced spudder so i think he is not foolish enough to take the pressure too high and he probably already knows that its stupid to take one near or over 100 psi. plus this isnt a ser...

Fahrenheit is linear, too. On a graph, if Celsius was "X" its graph could be f(x)=x. The line for Fahrenheit could be f(x)=9x/5+32. you will find that both are lines, and are therefore linear. but fahrenheit is still a measurement used in mainly in the US. kelvin is the widely accepted scientific m...