thank you mrcrowley. I really appreciate it. It finally totally makes since. so basically one side of piston has air pressure to hold valve closed. once the combustion happens the force pressure is greater forcing piston back to allow the air to escape through barrel. thanks for the details.

ok so i have come to the realization that i know how to make a barrel sealing piston valve. but the kind i know how to make only pertain to air cannons. i guess i am still not understanding how it would release pressure into the barrel in a hybrid launcher

thank you for the replies. I will post some pics, and drawings of my design. I understand the concept of the piston valve design. I guess that i am not inclined enough to make my own design for it, and or incorporate it in my design.

i want to make it where i no longer have to use burst discs. it makes the reloading process that much longer

i guess a piston valve set up is the way. it is the part of knowing how to make it is my issue

Edited by jrrdw, double posting use the edit button if no one posted under your last post.

I am in process of building a hybrid, but am lost when it comes to building a good valve idea. My other hybrid used burst discs, but the problem with that is they need to be changed after ever shot. Any ideas would be helpful Edited by jrrdw, don't use all caps in titles. Misleading topic title edit...