Hi Dar ,

Mmmm interesting points you say ..... I have some questions though

You say that the tips of the prop must promote/have smooth shape to produce good thrust right .... and what if I modify the airfoil trying to leave a smooth shape ( as the pic below ) including the original shape of the tips ?? will work ???

What exactly you mean with chopped prop ? .... to shortened .... ???

Why you say that a shortened prop will take ages to produce effective thrust ???

I have reduced one inch a prop and also reduced its airfoil with good results and another props with only reduced airfoil with awesome results , this is what makes me think that "probably" my crazy thoughts about an aggresive pitch with 9" could work , not sure at all as I only have reduced one inch and that's the reason why I'm making a lot of questions and I like to learn from others .

Ahh and I suggested 12x14 because I saw a guy in the thread you mentioned using that prop and that made me think that exist .

Thanks in advance

P.S. Sorry to kidnap the thread freakingfast .