I purchased the K&B .61 Twister (6170) and put it on my scratch built Edge with a total weight of 5 pounds (same weight as it was with my Mecoa .46). I flew it for the first time with this engine and it had tremendous power. It will climb straight up at a little less than half throttle with an APC 13x4 sport prop, however making it hang on the prop was difficult. It would either fall out of the hover or climb out with very little throttle difference between the two (I hope that makes sense). I’m running the engine a little on the rich side as per the instructions and am getting right at 12,000 rpm with this prop. I could use some prop suggestions to give me better throttle control for 3d and hovering. Please help!!! Thanks.