A prop turned backwards will still push air in the direction it is manufactured to.
(Just not as efficiently)

If he's sure the engine is turning counterclockwise as normal, when viewed from front,
then he has a pusher prop installed, and there's no other answer.

Another hint... if the engine is developing full power, throttles fine, etc...
it's not running backwards, as the timing would make it run very poorly backwards.

Fit a new prop and try again.


faisalk... can you post a picture of your prop?