The Saito engines are good gear and ours have not presented a problem, we didn't adjust anything inside the plane just slotted everything in to place, hooked it up and away it went. We just found that the 52 Magnum and the TT 54 were ok but there was only just enough power. With the 72 Saito it has plenty of power and will do anything you want it to. I don't know why the TT motors would not function in the PC9. We had about 6 flights with them and they failed. We had them fixed under warranty and now have them the right way up in other planes and they seem to be ok.

My son is a much better pilot than me. He can do just about anything with the plane and really enjoys flying it with the bigger motor. The only difficulty I find with the inverted motor is with glow drivers. We have fitted remote glo drivers to our aircraft to ensure we don't have to mess around trying to fit the glo driver with the starting procedure. We only used cheap ones that cost about $10 each. They work well and keep fingers well away from spinning props.

You will enjoy the aircraft they are fun to fly. Either the 61 FS or 72 FS will fly the plane very well. We just used the 72 because we had a couple of them in the drawer.