Setback rule

Discussion in 'Boat Yard Basics' started by rkmurphy, Dec 20, 2009.

  1. rkmurphy

    rkmurphy Well-Known Member

    For the experts...

    What, EXACTLY, is the setback rule regarding running height? i.e. - how much height can you gain per 'x' inches of setback?
     
  2. Brett

    Brett > PRO STAFF <

    No exact measurement RK.
    Every hull is different.
    Every hull is loaded differently.
    That's the reason for jack plates.
    They are adjustable in small increments.
    Trial and error to find the best setting.
     

  3. rkmurphy

    rkmurphy Well-Known Member

    I kind of figured as much...

    Well...here's what I've got so far:

    Straight edge level with bottom of hull (which is obviously flat bottomed) = 2" from bottom of cavitation plate (@ the water intake)

    Distance from bottom of cavitation plate to top of water intake = 1 1/8" (distance from bottom of cavitation plate to top of ugly, chewed up prop is the same)

    Setback = approximately 4.5"

    How does that sound?
     
  4. The_Skiff_Shop

    The_Skiff_Shop Well-Known Member

    414
    0
    391
    Probably 1/2" to 3/4" low from my experience but its conservative.  You would most likely need a stabilizer plate and a heavy cupped 4 blade prop to get it higher.

    Just my .00000000000002.5 sense
     
  5. rkmurphy

    rkmurphy Well-Known Member

    So, it should be fine where it is with a stock/OEM prop (11 pitch) and no Permatrim?

    Capn' Ron, I'll probably be calling you sometime next week about a new prop! I'll be needing suggestions!