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  1. #1
    Member
    Join Date
    May 2014
    Location
    Southern Utah
    Posts
    15

    Prop suggestion for 721/250SHO at elevation

    Also posted in props section but thought the Phoenix group might be able to give me advice from experience on their boat.

    Hoping someone can steer me in the right direction on what prop to purchase for optimum speed & performance at this lake. This run was empty and I didnt even think to fill up livewells and see what happened. I do have to chop the throttle a couple two-three times on holeshot to boost rpm’s as soon as it hits 3000 and above it takes off. Looking for suggestions for tournament load with partner and livewells loaded.


    Boat: 2015 Phoenix 721
    10” Atlas Hyd JP
    Dual 10ft 3 stage Talons
    4 batteries
    1/2 tank of gas. Approx 20 Gallons.

    Motor: 2015 Yamaha Vmax SHO 250
    Prop: Yamaha Vmax SHO T2 25P

    Light load 2 guys 200lbs tackle and live wells empty. Hydraulic jackplate set at 20 (1.5”) p2p at take off and lowered to 14 (3”) for run.

    Elevation: Lake Powell Utah/AZ 3500ft.

    Boat performance: Air Temp 68*, Water Temp 60*, RPM 5414, GPS Speed 68.2 mph

    Was told I should go with a 22pitch Yamaha T2 prop. Seems like rpms would be right and holeshot would definitely be improved but I am worried about losing my top end. Anyone have an approximate difference in top end between a 22p & 23p. Or other prop suggestions.



  2.  
  3. Member
    Join Date
    Mar 2017
    Location
    Southeast
    Posts
    655
    #2
    You could probably get away with a 23p. You'd be about 5700 with it but the motor should be making more power by then and pull a few more rpms on its own.
    Bump the plate up to about 2" p2p where the sho lower and props like to run on these boats and I'd think you'd be close to 5900.

  4. Member
    Join Date
    May 2014
    Location
    Southern Utah
    Posts
    15
    #3
    I had read previously they like to run higher. I tried going up higher to with the jp to 2-2.25 and actually lost top end speed. However I’m not sure if that had something to do with the wrong pitch of prop for the elevation.

  5. Member
    Join Date
    Dec 2016
    Location
    Liberty Hill Tx
    Posts
    24
    #4
    I would try a 22” Bravo XS should carry a Tourny load pretty good at your elevation. I’m running a 26” 5800 at 73 mph fully loaded at 1 7/8” below pad .

  6. The Kairos Lures Guy Fidgetcranker's Avatar
    Join Date
    Sep 2013
    Location
    Cincinnati, Ohio
    Posts
    2,757
    #5
    Unfortunately, there is many options for you to experiment with, all of which is not cheap.
    Try to contact Mark Croxton about your issues and see what he recommends.
    Be sure to have all your numbers handy. He will need them.
    http://www.marksprops.com/