I can remember one fishing boat was running a 6 or 7 blade sub prop...From what I have gound online (which is extremely limited) it seems that a 4 blade will provide better thrust and initial take off, but will be slower then a 3 blade. So it would seem that a 5 or 6 blade would only be an extension of that principle. So I think I'll first try a 4 or 5 blade prop, I came pretty close to getting a drive system setup tonight. But I am going to need the boat here for some measurements for placement of the motor, and overall length of the prop shaft. I am going with a 75MM prop, with the before mentioned motor, battery and esc setup. Along with a 2:1 belt reduction, I am guessing this setup with be a bit over torqued and under worked as far as the motor goes. Hopefully I'll be able to attain good thrust from this setup, without having to order diffrent pulleys for the reduction setup.