ORIGINAL: SrTelemaster150
ORIGINAL: Desertlakesflying
ORIGINAL: Hobbsy
Double f, I like to use engines on the lower end of the recommended range, that lets me be a pilot instead of just a throttle jockey. I got heck for this the very first time I flew a plane. I had a Kombat 40 with the 60'' wing option and had an Enya .46 MKII. Everybody who looked at it said it wouldn't fly because the engine was too small. Well, somebody forgot to tell the engine, it flew just fine and it was 100 degree day in about 1991. That was my very first flying lesson.
Take it to 5000' and try that. A trainer with a 40 is on the edge of a stall the whole time, and a 46la is barely an improvement. Bad advise unless you ask about a persons altitude first.
A 180-200 4-stroke is hardly ''on the lower end'' of power on an 80'' WS <18# monoplane. HP sells engines. TQ pulls big airframes into the air swinging larger higher pitched props.
I wonder? Which would be more affected by altitude, a 2-stroke or a 4-stroke of similar HP?
Between 2 and 4 stoke I've had more issues with ambient air temperature than with altitude between them. My 2 strokes run great hot or cold, but my OS 4 strokes do not like the hot at all, especially the OS-120FS pumped engine.