PVC not good for hybrids ,thanks for the input.Safty first I guess within reason of course LOL
Stu 8)

Just a guess momentary peak pressure

Thanks Grumpy Old Fart
Sounds like were getting into the 400-600 psi range will switch to metal parts if thats the case

Thats an interesting design and yes the parts are plastic for now , have a metal lathe and milling machine its just easer machining plastic LOL

Yes can change spring pressure , just want it to hold back the 28 psig mix until the boom- the chamber is sked 80 the rest will be wrapped in fibreglass
epoxy for reinforcement have you seen this done yet ? and does it work ?
Stu

Hi from Canada , I am mulling around an idea here goes , I am building this into a 3" T , a piston valve held against the combustion chamber outlet with a compression spring behind it to hold the chamber @ 28 PSIG in theory the subsequent pressure rise on ignition will overcome the spring and dump t...