200xs ROS....prop learning.

Discussion in 'Propellers' started by ROBERT CROSS, Jul 13, 2017.

  1. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    Found out from Thom at Hydromotive why the new 25p Q4 OT Round Ear has a slower hole shot than the 24p Round Ear on the 225x PM.

    The new ROS had an open exhaust 'snout', 'cuz it was set up for an 'over hub' prop.
    The 25p is a thru hub prop and requires the exhaust to optimize performance.
    Checked the parts manual and sure enough both plates are offered....I just fabricated an aluminum plate and installed it above the hole'e one.
    [​IMG]
    [​IMG]

    Will update performance this weekend.......if the weather co-operates.o_O
     
  2. pkstv

    pkstv Active Member

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    That's really going to make that motor a lot quieter . That's the part I like , Loud Tuned Power !!
     
  3. 90 5.0

    90 5.0 Active Member

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    Interesting, my 26 q IV ot holeshots at least as hard if not harder than my 26 offshore cut chopper on my PM on a 15"'offshore mid with exhaust open
     
  4. xb03

    xb03 Active Member Supporting Member

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    Thats what I like about an offshore mid, you can tune it to your liking. I made a solid plate as well, but ended up with 5-1/2inch holes. Most of the time I dont run it because it doesnt sound as cool.
     
  5. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    Is it the 'round ear'?

    Thom said it's the OT round ear that is effected....the one on the right.
    [​IMG]

    Funny thing.....Even with the open plate the Opti is a lot quieter that the PM was.:confused:
    Smoother with a lot less vibration too.

    Hope to ck'r out tomorrow & Sunday.
    Bob
     
    Last edited: Jul 14, 2017
    gmorgan likes this.
  6. ssv1761982

    ssv1761982 Active Member Staff Member

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    I thought the round ear was better suited to the 21 footers. The one on the left is what they made their name with on the 2003s.
     
  7. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    The one pictured is the 24p Thom originally recommended for GS#1 with the 225x PM, it was a real hoot.

    He said the 25p should work great with the mid-range punch of the 200XS.
     
  8. 90 5.0

    90 5.0 Active Member

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    No not a round ear, run the one on the left.
     
  9. Lotus 50

    Lotus 50 Well-Known Member

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    200XS has 1.75 gears? Does that affect bottom end much?
     
  10. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    Our '13 ROS has 1:87...I believe once I get it dialed in it will be at least as good as our 225x PM was with the 24p...if not better. fullsizeoutput_15cc.jpeg

    fullsizeoutput_15cb.jpeg
     

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