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Thread: Phantom 25 w/450R - prop setup
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11-12-2021, 12:09 PM #15000 RPM
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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, ToffenLast edited by Toffen; 11-12-2021 at 12:13 PM.
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scott reierson liked this post
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11-17-2021, 10:07 PM #25000 RPM
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Yes, less diameter will give you less stern lift and more rpms.
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11-17-2021, 10:33 PM #35000 RPM
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I would just cut the barrell first... Before you do anything with the diameter.
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12-18-2021, 04:37 PM #45000 RPM
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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
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12-18-2021, 06:44 PM #5Team Member
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Are you testing this time of year or waiting for spring?
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12-19-2021, 05:59 PM #65000 RPM
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Hi!
Its winter in Norway so unfortunately I need to wait until May We are counting the days !
Cheeers, Toffen
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06-02-2022, 06:03 AM #7
Hello Toffen
Send me a PM when you get a chance your inbox is full.
Thank you
Hugh
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