Thank you for Your Replys you Really Helped Me But Now all i Have is One More Questions and that is: how Much Air/Propane Should i use (S.P. id Prefer you Tell me in P.S.I.)

Pleas And Thank You.

I am in the Process of Building a Spud Gun and iv Got Every Thing Down But The Stoichiometric's. (A.K.A. Fuel/Air Ratio) Number One:I Can Calculate the Stoichiometric's But When i Do i Have the Answers in Volume i Need Some Thing in P.S.I. i Mean How do i use Volume as an Answers Ane way. Number Tow...