If you can feel a wind blowing over the engine it's running in the right direction.
Not really true Steve. If the prop is on backwards it will still blow air backwards, just not as much.
If that weren't the case they wouldn't have to make "pusher" props, we could simply turn our props around.
Chip Hyde the last TOC winner use to have an Ultimate bipe he would land and had a way to reverse the engine and would back the plane into its landing spot.
Chip must have had a Tx controlled variable pitch prop.
Dennis-