ORIGINAL: mike109
G'day Jolly Popper
For me it is reliability. The planes I fly don't need raw power. I don't race.
I did do a little control line racing back in the 70s and even then I found that reliability would nearly always win anyway. I used to use a Super Tigre G20 diesel (2.5cc) in Goodyear racers. The Tigers were every consistent, easy to hot start and powerful enough to be near the front of the pack. Later I got bored with this and bought a Rossi 15 (glow). I did even better with the Rossi but there were occasions when it would just not re-start.
Most of my engines now are four strokes. They are reliable, and do what I need them to do but I do have some Enyas and a Jett if I want to play power games.
So if I could choose only between power and reliability, I would choose reliability every time.
Mike in Oz
+1
After you have spent an hour trying to get a problem engine going, reliability wins every time.