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    Re: Leg 56 Question # 3
    From: Robert Owens
    Date: 1999 Jul 20, 7:02 AM

    -----Original Message-----
    From  Lu Abel 
    To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
    
    Date: Monday, July 19, 1999 10:46 PM
    Subject: Re: Leg 56 Question # 3
    
    Snip-----
    
    >Way behind - The USPS courses, for example, discuss obtaining speed vs RPM
    >curves for one's boat.  Good 1920's practice when electronic knotmeters
    >didn't exist.  Maybe actually carried into the 1950s by the Navy.  Has
    >anyone on the list actually made such a curve?
    >
    Snip
    I did a Speed vs RPM run after I bought my boat.(26' Nordic Tug) It took me
    practically all day but I now know how fast my boat moves through the water.
    Then I calibrated my knotmeters. Both were off quite a bit to my standards
    and both have adjustments and come with instructions on how to do it. I have
    both Loran and GPS and do not trust either as true speed indicators.
    Although the loran is much more accurate than the GPS. I have seen errors up
    to 1.8 knots on the GPS. Try doing a predicted log event with nothing but a
    tach and compass. Using your arguments about the 1920's why bother
    compensating and adjusting your compass.
    I don't see the difference between a boat and an airplane as far as how fast
    does it cruise at certain RPM's and how much fuel do I burn.
    I go at this at a ridiculous extreme. Two decimal points. But I win my local
    predicted log events and can tell you how much fuel it will take to fill the
    tanks to the quarter gallon. If I run out of fuel it will be a leak. This
    dribble is just my opinion.
    Bob Owens
    TUGLY
    26' Nordic Tug
    

       
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