Just had 4 flights with the pusher prop on the Scorpion 890kv motor
in the E Cardinal,works great,very good in the wind,running 8450 rpm
and added 1 ft in line length to 61 ft end to end,0.015",lap time 5.3 sec.
Paul

Paul,

The next thing to try is an 11x6 3 blade Pushers Master Air Screw or one of Dennis A's 13x4.5 3 blade Pusher APC's cut to 12 and run at around 9200rpm. I have been flying the 3 blades and like the way they pull in the corner. If you use the MAS as received the pitch is about 1.5" less then the marked pitch, you can either repitch with a heat gun or bump up the rpm until the lap time comes in. They are a little more work to balance (just start sanding the face of the heaviest blade first then move to the second heavy, work back and forth between those two and it will come in). On my ship the 3 blade is very smooth and quiet, also seems to create less wake in dead air. Good luck.

DennisT