ORIGINAL: SeamusG
OK, so I ''give it a go'. What am I looking for? When will I know when all is a best that it can be? A tach is useful at the bench - not the same as in the air. I can see / hear throttle response on the bench - not the same as in the air. How can I tell?
"Give them a go" meaning fly them

That`s the only way to find the "best" prop for your application. You will soon find your favourite prop after trying a few different ones