Thanks for the pics and the answer Dar , now I get anothers points to keep on mind . [sm=thumbup.gif]

freakinfast thanks for the answer too and to be cool

I'll do kind of "experiment" with a prop (11x12 shortened to 9x12 ) and see how it work on a OS 61 RF and on a sleek airframe , just to have another own experience and I'll report it later .



P.S. the pic below encourage me to do it .