Im working on a UAV hybrid, and i have 2 engines with differing and confusing specs.
My aim is to gear down the output to around 5000 RPM to match the alternator.
The first engine, is a Kyosho GT 0.15Ci (2.5cc) rated at just under 0.5 Hp at 29,000 RPM so reduced to 5000 RPM should give me a theoretical 3 Hp or approx 2.2Kw..ish
The other is an elderly MAX OS 40, ive not found out much data on this engine, but even though from what i can find out, its 0.4Ci (about 6.2cc) but only rated at just under 0.7Hp at 12,000 RPM, geared down will give me less power.
Have i researched the wrong data, and are the facts ive found, wrong?
So from the above, which is the better engine to use?...I get the feeling it might be the Kyosho, can you please advise.