all good points. I'll add one. Paint the TIPS of the prop WHITE. It makes a very visible arc you can see. All my smaller props had this white tip. and I never took a hit in 10 yrs.

I recently went to a .91 Saito 4 Stroke, 3 Blade MAS 14x7 and the "MAS" Logo is on each prop. but about 2 inches from the tip. However it makes a nice visible arc when running. BUT! there is still another 2 inches of almost invisible prop arc on the outside of that, and that is what I connected with. Lucky for me. I was bringing my hand from back to front. and never got cut, only bumped.
The sharp part is the leading front edge of the prop. Did I tell you how much I like white tips?!

Rick.