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  1. #1
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    Phantom 25 w/450R - prop setup

    Hi!

    I hope you all are well

    I replaced my 400R with a 450R this summer. With the 400R my boat ran 88 mph at 7,000 rpms with a max5 25 15 dia prop. Sportmaster 1:1,75 gears. Propshaftheight 2 inches above the bottom.

    With the new 450R top speed is 93,8 mph spinning a Max5 27 ST 15,25 diameter to 6,200 rpms. The acceleration is unbelievable. However, at top speed the boat runs too high at the transom, and I feel I am on the edge to propwalk. Propshaftheight is 2 inches above as with the 400R. Higher I loose bowlift and speed.

    Ideally I should have top speed rpm to be 6,300. The 450R does 450 hp from 6200-6400 rpm. I have a short tube version so maybe reducing the diameter to 15 inches will set the transom more and give me 100 rpm?

    What do you reccommend?

    Thanks !

    Cheeers, Toffen
    Attached Thumbnails Attached Thumbnails Phantom25 450R august 21.JPG  
    Last edited by Toffen; 11-12-2021 at 12:13 PM.

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  3. #2
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    Yes, less diameter will give you less stern lift and more rpms.

  4. #3
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    I would just cut the barrell first... Before you do anything with the diameter.

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  6. #4
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    Hi!

    Thanks I have decided to cut 6-10 mm ff the barrell. And not touch the diameter. So we see and test !

    Cheeers, Toffen

  7. #5
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    Are you testing this time of year or waiting for spring?

  8. #6
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    Hi!

    Its winter in Norway so unfortunately I need to wait until May We are counting the days !


    Cheeers, Toffen

  9. #7
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    Hello Toffen
    Send me a PM when you get a chance your inbox is full.
    Thank you
    Hugh

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