High thrust vs. standard

Discussion in 'Outboard Maintenance' started by ADicus, Jul 25, 2015.

  1. ADicus

    ADicus I Love microskiff.com!

    353
    39
    163
    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?
     
  2. Brett

    Brett > PRO STAFF <

    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.
     

  3. ADicus

    ADicus I Love microskiff.com!

    353
    39
    163
    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?
     
  4. Brett

    Brett > PRO STAFF <

    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.
     
  5. ADicus

    ADicus I Love microskiff.com!

    353
    39
    163