It depends on what it's used for, I have a LA46 on my Kadet Seniorita it hovers at 7/8 throttle running a little rich, (had a LA40 first it would only tailslide no hover)I would like more power but that means a heavier bb engine or a expensive small Hi Perf engine, a heavier engine would ruin the great flight characteristics of the plane, so for certain planes it's very good, 125 flights with no deadsticks so far and still runs as new or better, I allso have a Macs one piece muffler to reduce the weight by allmost 2 more OZs, if I were setting up my first trainer unless it's as light as a Seniorita I would go with more power than the LA46. my 2 cents