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Asked dealer about switching to 4 blade and hetold me it would put too much strain on 115 Yamaha.
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told me it would put too much strain on 115
The 2 blade was the "speed prop" and would kick that little boat to around 52 - 53 mph, but wasn't recommended because of the twisting effect it would have on the lower unit gears. No idea of the truth of that, but it was the wisdom of the time. (1972)
True or not, just thinking about it, I would think that the 4 blade would give a more even, smoother push than a 3 blade. To my thinking, diameter and pitch would affect the strain on the motor, not the number of blades.
Also, nothing about a 4-blade is going to be inherently more straining on a motor. The 4-blade will grip better so it'll act like it's a higher pitch, thus lowering the RPMs; but this is something that should be accounted for when deciding on the proper size and pitch. If the motor is running in the correct RPM range at WOT, you're fine no matter have many blades you have.
With the stern lift you should love a 4 blade on a flats boat.