I ran 4 1/2 tanks of fuel through the engine and had to tweak the low end to get a good idle but other than that, the Super Tigre G90 purrs like a kitten. Even at a low idle running the APC 14X4W prop the plane will not stop from rolling. At our field we have both concrete and grass runways. I alway use the concrete for take offs and landing but with this plane I will have to use the grass to control the take offs and landings just to get it to slow down. I bought the 2!QUOT! True Turn spinner that holds the bigger APC props and the Adapter Kit I got for the ST G90 would not fit. The nut that came with the kit would not tighten all the way down onto the supplied washer. I put the stock washer on top of the prop, then the washer that came with the kit on top of that, then the adapter nut and tightened it down. I had to cut the bolt off that holds the cone in place. Didn't know what else to do, it seems fine after 4 1/2 tanks of fuel. She's heading for the blue Sky's in the morning