Seacraft 32. Twin 200 Yamaha 4 strokes!

[Bushwacker]

Originally Posted by gofastsandman

Let me take my little brain off the short bus for a minnow. If 1 LU is being asked to push the same weight as 2 , is that not increasing the loads of torsion, shear, and compression?

If 1 LU was pushing boat at same speed as 2 motors, then yes all loads would be up by 2X . . . but it can only develop the thrust of 1 motor, so loads are not any higher. The lower thrust of just one motor is why speed will be lower.

Regarding a spare prop for twins, assuming one was counter rotating . . . wouldn't it make sense to buy a Piranha plastic prop hub and then 2 sets of plastic blades, 1 std and one counter rotating set? (Assuming they even make counter rotating blades!)