first coaxial plans

[sandman]

:facepalm:
duh i knew that
maybe i should just go back and stick with rocketry

[jean]

yes i´m a noob but when you use a endcap as piston change the side where the sealing face is.
like this..
http://www.spudfiles.com/forums/files/piston_203.jpg
the pilot volume is smaller, barrel is longer and chamber is bigger.

jean

[BigJon]

I guess that would work but it might restrict airflow a little.

[Easterbunny]

wait am i goanna need a bumper?
if so will a pice of foam work?

[sandman]

people like to use pool noodles

but if your using foam it has got to be some tough foam