WreckRman2 said
Again being a trainer the faster you pull it the quicker it produces lift
and
we never fly a trainer at full throttle so top end speed isn't what were looking for
So, umm, according to that, a higher airspeed is important for more lift, but since it's a trainer we dont' fly at higher airspeeds. Ok, gotcha.
Ok, seriously, of course more airspeed is more lift. And yes, you don't want to teach someone that back stick makes you go up.
Weither an LT-40 would climb better on a 11x5 or 11x7 depends more on the engine and brand of prop. But an OS .46FX on a 6-7lb trainer, I'd take that bet
.
Is there anything wrong, IMHO with an 11x6 or 11x7? Nope, nothing wrong with it. Is a 5" pitch necessary? Nope, it's not, never said it was.
What is "better"? It Depends.
Do you fly off of pavement, or a nearly unimproved back lot? Do you have all day to climb out, or do you have 60' of trees at the end of the runway? etc etc etc. Lots of factors.
All I was saying was that there's no reason not to try an 11x5 if you have one. You might like it. You might not. You won't hurt anything by trying it. Go ahead and try an 11x7, and see what happens, you might like that better.
However, I will say that my experience teaching has been that guys get in to more trouble early on with learning to think ahead of the plane rather than reacting to it. Slowing the plane down makes it easier on a beginner. It makes landing a little easier as well.