All good advice here. I concur with the idea of using MA propellers, I've found the APC's are going to buy new boats for hobbyshop owners....

There is another topic in play here, this is a beginner with some serious horsepower on a 'trainer'. I suggest using a 12x5 or 12x4 propeller on the engine to carve off some of that top-end velocity from the airplane, and to let the engine at idle offer a lower airspeed, so the airplane will actually come down at idle. A 6-pitch prop at idle may well be producing enough thrust to seriously flatten the approach path. Lord knows he has enough thrust available from the engine. He doesn't need an 80-mph 'trainer'. We've done just that with LT-40's and it's done good things for the trainer role. Still plenty fast, but potential to land without as much engine thrust at idle, and bags of climb performance.