Do you think it will be powerful?
O, and, spud gun can be made out of soft PVC pipes without exploding?
My 3rd spud gun plans
No it is not going to be powerful, and you should make it out of hard PVC. *sarcasm*
No but really...
Do you realize just how vaguely you used the word "powerful"? And what do you mean by soft - and I would assume hard - PVC?
On the end of your chamber you want a 3" female adapter, with a 3" threaded plug. For pure aesthetic reasons I would suggest "butting" all close fittings together by using a length of pipe slightly under the combined depth of both socket fittings. (which you appeared to already due in your diagram) Also you may consider this:
"Recoil puts a lot of stress on the elbows, barrel supports clamping the chamber and barrel together are recommended to reinforce the launcher and keep the barrel steady."
No but really...
Do you realize just how vaguely you used the word "powerful"? And what do you mean by soft - and I would assume hard - PVC?
On the end of your chamber you want a 3" female adapter, with a 3" threaded plug. For pure aesthetic reasons I would suggest "butting" all close fittings together by using a length of pipe slightly under the combined depth of both socket fittings. (which you appeared to already due in your diagram) Also you may consider this:
"Recoil puts a lot of stress on the elbows, barrel supports clamping the chamber and barrel together are recommended to reinforce the launcher and keep the barrel steady."