dual tank t-shirt launcher

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26216
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 576 times
Been thanked: 347 times

Donating Members

Mon Nov 05, 2007 5:29 am

mega_swordman wrote::?: Sometimes I just don't get you Jack.
It was an exclamation about the shattered cannon

Fork in hell ;)
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jimmy101
Sergeant Major 2
Sergeant Major 2
United States of America
Posts: 3206
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Has thanked: 6 times
Been thanked: 18 times
Contact:

Mon Nov 05, 2007 10:56 am

Looks to me like the recoil of the barrel broke the t-fitting.

The mass of the chambers and pressure bottle wan't to keep that part of the gun stationary when you fire it.

The barrel and valve assembly recoils and all the force is concentrated on that t-fitting. The combination of the recoil force and the fact that the system is still at nearly full pressure is just too much for that little fitting to handle, even though the gas pressure is well within it's spec.

You need some way to transfer all of the recoil energy from the barrel assembly to the resevoir + air bottle assembly. Or, like others suggested, use much larger fittings in that part of the gun.

Perhaps add a bracing plate where the red line is in the attached drawing.
Attachments
CannonProblem.jpg
CannonProblem.jpg (38.97 KiB) Viewed 1197 times
Image
User avatar
patton
Private 2
Private 2
Posts: 23
Joined: Wed Oct 31, 2007 3:52 pm

Mon Nov 05, 2007 2:52 pm

thanks for the tips, the cannon was not stable at all without the wooden stabilizer becasue the entire weight of the valve and barrel would have been on the T Joint
Post Reply