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Bertram 28 top speed

Discussion in 'Bertram Yacht' started by ipeoples, Feb 23, 2010.

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  1. ipeoples

    ipeoples New Member

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    My Bertram 28 has 2 mercruiser 302, at WOT top speed is 15 knots @ 2000rpm. Any idea why on gear at WOT she only up to 2000 rpm?
  2. jbk4001

    jbk4001 New Member

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    WOT should be 4200 RPM....something is wrong....:confused:

    Props not correct?

    Bottom dirty?

    Tune -up?

    I would think one of the above (or any combo of all three)

    Hope this helps...
  3. CSkipR

    CSkipR Member

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    Boat Speed

    How long have you owned the boat? What was the speed or rpm before this? Has the boat been sitting for awhile without running. Definitely sounds like a dirty bottom or propped incorrectly.
  4. Capt J

    Capt J Senior Member

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    Or a bad motor that's not putting out it's rated power.

    A friend of mine put 240hp Yanmars in his 28' Bertram Bahia Mar (express), and it does 34 knots.
  5. NYCAP123

    NYCAP123 Senior Member

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    2000 rpms on both motors? Wrong props, bad bottom or bad fuel are most likely.
  6. Ormond Bert54

    Ormond Bert54 Senior Member

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    My Bertram 28 with 350ci Vortec 5.7 engines does 27 knots WOT ... 4000 rpm's. I'm going to try the stock props this summer and see what happens with the performance numbers. I cruise around 3200 rpm's and 22-24 knots.

    Mike
  7. NYCAP123

    NYCAP123 Senior Member

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    Sounds right on target.
  8. ipeoples

    ipeoples New Member

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    Bertram 28 top spped

    I purshase the boat recently. Im goig to inspect the bottom and then work with propellers. Thanks to all of you!
  9. jimgeorge

    jimgeorge New Member

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    my 28 with 2 225 honda 4 stroke outboards and a bracket does 28 at 4000 RPMs and 41 at 5500 RPMs.
  10. ThePuf

    ThePuf New Member

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    That sounds right. I've got twin Yamaha 250hp on mine and seeing the same sort of speeds. 40 knots is plain scary

    Puf
  11. Capt J

    Capt J Senior Member

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    Those are good numbers. I ran a 28 with Yanmar 185hp engines and it cruised at 20 knots and topped out around 25 knots. I think the Yanmar 220's would be the ideal engine for those boats......The 185's barely kept it on plane at 20 knots, you needed a lot of tabs otherwise they would only push it 16-17knots at cruise.
  12. jimgeorge

    jimgeorge New Member

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    speed

    It's not scary to me. I was a EVINRUDE test boat driver in the early 80's.I went 83 mph in a 20' ranger bass boat with a 300 GT V8 outboard.
  13. Capt J

    Capt J Senior Member

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    Speaking of which, A friend of mine has a 20' ranger with a built up 250hp ocean pro and it does 92mph on gps. It starts getting a little scary after 75mph and start chine walking a little and stuff......
  14. ThePuf

    ThePuf New Member

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    Mad...Quite mad!!

    :)
  15. Capt J

    Capt J Senior Member

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    So is the owner. LOL
  16. Ivboost

    Ivboost New Member

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    I know this is a old thread, but someone may find this information helpful regarding repowering there 28.

    I have a 1981 Bertram 28 flybridge. It came factory with a pair of mercruiser 228 running alpha's. I repowered it 6 months ago with a pair of 5.7l vortec 280hp spec motors. The gimbals were replaced and new SEI standard and counter rotation outdrives fitted. The Alpha's are running 1.5 gear sets and props are Mercury 17" Rev4, it is currently a little over propped, looking at going back to 15's.

    Anyway here are the numbers, Speed and fuel burn with full tanks, 44 gal water and 200gal fuel


    1200rpm 6kn 6gal
    2450rpm 16kn 14gal
    2850rpm 19kn 16.3gal
    2900rpm 21kn 17.2gal
    3100rpm 22kn 19.5gal
    3200rpm 23kn 20.3gal
    3400rpm 25kn 26.9gal
    4050rpm 34kn 42gal

    If anyone has speed and fuel burn numbers for a 28 with outboards or diesels I would love to see them.
  17. dsharp

    dsharp Senior Member

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    What is the pitch on the props that you have now?
  18. Ivboost

    Ivboost New Member

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    Props are revolution 4's. Stainless steel 4 blade 14 5/8 diameter by 17 pitch
  19. Jeff Gingrich

    Jeff Gingrich New Member

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    Is that fuel burn per hour or mile ?
  20. AMG

    AMG YF Moderator

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    Hello Sir, do you want me to remove your post..?