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Discussion Starter #1
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?
 

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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.
 

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I Love microskiff.com!
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Discussion Starter #3
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?
 

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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.
 
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