[ADicus]

Hey guys does anyone know if lower units are interchangeable between high thrust and standard ie: a large prop to small prop lower unit? I have a 99' Yamaha 2-stroke on a 99' pathfinder tunnel. I was curious if there were any advantages of running the smaller wheel vs. the bigger. I understand the high thrust is for more of pontoon boats with a lot of drag but I'm pushing a 17' tunnel and have seen similar boats with the smaller wheel?

 

[Brett]

High thrust is geared down lower unit intended to spin a large diameter, lower pitch blade.
Designed for pushing hulls through the water, not over.
Standard lower unit is intended for lighter planing hulls producing more speed and running on top.

 

[ADicus]

Thanks for the input ! So i would be better suited for a standard lower unit with a smaller wheel to push my 17' flats boat around?

 

[Brett]

Standard lower unit with a cupped 3 or 4 blade prop
to fit the designed top rpm's of the outboard.
don't want a prop that drags the top rpm's down to 4900
when the recommended engine rpm is 5600.

 

[ADicus]

Thanks!