jim beam

sorry for my bad english

and this is properly not the right thread for this type of question

i thinking about a alternative for a rocket turbo pump motor (just thinking)

i shoud be easy to construct, reliable and "cheap"

i ended with a combustion engine fed with compressed air (nitrogen/ oxygen mixture) and gasoline of corse

sounds stupid, but i think i coud work.

a very simplified calculation:

e.g. a 1l 4-stroke engine engine shoud breathes @ 10k rpm 5000l air per minute, burning duration 240sec -> 10000l

air can easy compressed to 300bar (as far as i know) -> a ~34l pressure bottle (and small amount of gasoline) should be enough for 240 sec run-time.

for performance tuning of the combustion engine the use of slightly more oxgen in mixture than normal air shoud work to (until the motor burns )

advantage:

- relatively lightweight

- reliable

- easy to constuct (modification of existing motors)

- easy throttling and restating

- relatively high efficiency ?!

complete nonsense or something that might work ? (e.g. for projects like http://copenhagensuborbitals.com)

some (usefull) respond would be nice!

best regards