SpudFiles

igiigi wrote:ok, if build a Hybrid Cannon with small chamber, i put some gas in and I need put air in right? without air it doesn´t works (becoase the chamber is to small)?

hmm can I put air with a bicycle pump in? and gas with tank injection?
if jes, how should the ratio of air/gas be?

Have a good read and understand the concept first

i did, and?

but a mix of air and fuel? oO

Ordinary combustion cannons use a mixture of air and fuel at atmospheric pressure. For a typical fuel like butane or propane the ratio is about 4% fuel, for example 4mL of Propane in a 100mL chamber.

In a hybrid, the mixture is under pressure, and for every bar of pressure you add, you have to add one volume of fuel.

For example in a 100mL chamber pressurised to 3 bar (45 psi), you have to add 16mL of fuel.

ok, but my quastion was, can i put the air with bicycle pump?
i don´t have a air ccompressor?

It doesn't matter as long as you have pressure

ok, what peace i have to use to stop the mix going out of the chamber as long i put air and gas in?

If it's easier for you, try Private Messaging the member who made this hybrid:
http://www.spudfiles.com/forums/first-h ... 18493.html

He's from Germany also.