BTW, you can see from the last couple of posts just how far off the usual advice is concerning 3-blade props. In the last couple of posts, the Master Airscrew that works so well on OS91s is a 14x7(3) right? Actual users show those 14x7(3)s on actual models that love 'em.

I've got 4 OS91s that love the 14x7(3) MA props. One is a IMAC style that gives better vertical and everything else with that prop. Sorry to have left that picture out, but I figured 5 pictures were more than enough.

Yet Master Airscrew recommends 11x7(3) to 12x8(3)s for .90 displacement engines. Amazing..... I've got 12" 3-blades on my OS61s and they love 'em.

And Master Airscrew recommends the 14x7(3) for 1.5-1.8 engines. How far off could they be...........

No wonder people don't know how great those 3 blades work. Even the mfg is giving lousy advice.