Hi bob62
It is best NOT to use the writing on the prop to determine proper installation. I suggest you view the prop as a wing and go from there. A friend of mine built a pusher Canard and asked me to check it over prior to he making the maiden flight, because I had designed, built and flown Canard planes using pusher props, like his used. I thought it was OK and he took off. Well, the take-off looked normal, but then he porpoised all over the field and crashed. His prop was one I was not familier with [I believe it was a German prop] and it took someone else to note that the prop was installed backward. I had missed that!!!!!!!!! A prop mounted wrong but running in the correct direction so it pushes/pulls air in the correct direction, will only handle about 70% of the normal amount of air. The plane may be able to take off, but will be very sluggish. As I mentioned earlier, learn how to determine proper installation by viewing the prop as a wing and go from there.