Boat review reliability?

Discussion in 'Boat Design' started by fcfc, Aug 6, 2017.

  1. fcfc
    Joined: Feb 2005
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    Location: france,europe

    fcfc Senior Member

    Two different review of a nordig tug 49 :

    Both claim 30 gph at top speed, which is more or less consistent with a 610 hp engine full throttle.

    Bot for one top speed is 14.2 kts. For the other 17.7 kts. Quite a difference.

    Where is the truth ???
     

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  2. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    That body of water can have significant currents, so the numbers may not have been corrected for them.

    It's more like a river, you need to make a run both directions and average it.
     
  3. jorgepease
    Joined: Feb 2012
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    Location: Florida

    jorgepease Senior Member

    Too bad they didn't post rpm on both of them
     
  4. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Most "reviews" are simply advertising favors performed by the media outlet presenting the review. This simply means they'll publish what they're told to publish. Some of the reviews might actual test the boat, but this testing usually isn't very accurate, nor well arranged (test equipment, procedures, etc.), so take it for what it's worth.
     
  5. JSL
    Joined: Nov 2012
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    Location: Delta BC

    JSL Senior Member

    One looks like a 'range' chart (how far can we go?) .. the other a speed chart.(how fast can we go?)
    Knots or MPH mixup, currents, RPM, goofy math, different settings on the engine, ????
    Not applicable here but even operating in fresh water can make a slight difference.
     

  6. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Ondarvr might be right, in a tidal rip, GPS is not accurate because it is showing speed over the ground.
     
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