Connor,


You are over-priming it for sure, like Turk1 wrote.

After priming the engine properly, I have seen some Evos that responded great to back-flipping.
You don't turn the prop backward; just 'bump' it against the compression.

It will take you a while to get the feel and it is best if the prop is mounted, so the blades are horizontal, as you start feeling the resistance of compression.

This is good for flipping regularly and also for back-flipping.

When the engine starts with a pusher prop and you are facing the prop, it should blow air in your face...
Cooling is impaired, as long as the model is standing still and will only be sufficient in flight.

Bruce,


On a .46 used for very high RPM, not with the standard muffler, a 9x6 could be good...
But not in this case. I would say a 10x6 pusher will do a much better job.