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50' performance with available power packages

Discussion in 'Post Yacht' started by Quality Time, Oct 7, 2021.

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  1. Quality Time

    Quality Time Member

    Joined:
    Feb 3, 2013
    Messages:
    47
    Location:
    Upper Chesapeake Bay
    Looking for real world cruise speed, fuel burn, load etc... with the different power packages offered in the 2000 - 2005 50's.

    820 MAN's
    860? MAN's
    CAT 3406E's
    Series 60 DD's
  2. PtJudeRI

    PtJudeRI Senior Member

    Joined:
    Dec 1, 2010
    Messages:
    137
    Location:
    Pt. Judith, RI
    I have an 02 with the CAT 3406e package.

    Top End is 2350 rpm / 32.2 kts. Burn was 80gals+
    high cruise is 2000 rpms. 26 kts. Burn is ~60 gals. Load 70-72%
    Easy cruise 1950 rpms. 25.5kts Burn is 54 gals/hr. Load is 65%

    Generally speaking, I have found my boat needs about 3 seconds worth of tabs to give me the best result. Tabs can add 1.25 kts and drop 2-4 gals per hour overall.

    Ideal running has coolant temp ~180 / Boost around 24 psi / Fuel filter pressure better than 65 psi.
    Quality Time likes this.
  3. Mark Cardillo

    Mark Cardillo New Member

    Joined:
    Jan 7, 2019
    Messages:
    5
    Location:
    Gloucester
    I have a 1996 50’ with 820 Mans. I run 27 knots at 1900 rpm. Burning right around or just under 60 gph. If I run it to the pins at 2300 I’m getting 34-35 knots.