My H9 edge at 12# was all I would want on the 180 for 3D. Was using 30 % and tryed a lot of different props. On hot days it didn't have enough. (90s) 18x6 pro zinger was the best thrust. had to us cline reg. to get enough fuel in the 180 to work the 18x6. cline added about 500 rpm

Randy