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Thread: Getting Ready for SHTP 2021

  1. #121
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    Before you mount it, can you plug it in and move a hand-bearing compass around it just to see?
    .
    Last edited by BobJ; 05-07-2020 at 10:14 AM. Reason: Can't spell

  2. #122
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    Quote Originally Posted by BobJ View Post
    Before you mount it, can you plug it in and move a handing-bearing compass around it just to see?
    Huh....sure I can. I never thought of that.
    S-2 7.9: "Wildcat of Loch Awe"
    1968 Selmer Series 9 B-flat and A clarinets
    1962Buesher "Aristocrat" tenor saxophone
    Piper One Design 24, Hull #35; "Alpha"

  3. #123
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    Raymarine specifies the minimum compass safe distance as 9" between the i40 display and the magnetic compass. It's in the i40 manual section 3.5...

    https://www.raymarine.com/view/index-id=4870.html


    - rob
    Last edited by tiger beetle; 05-05-2020 at 07:30 PM.

  4. #124
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    Looking over the SHTP rules, I see that I need a knotmeter. Will the speed function on a GPS suffice, or does it need to be a separate, dedicated knotmeter? If it has to be a separate knotmeter, that's gonna hurt because almost nobody makes one any more. The Raymarine i40 is $250, but it will require me to haul out again for a day, which will be another $350 or more. Humminbird used to market a $99 knotmeter and a $99 depth sounder, but no more.
    S-2 7.9: "Wildcat of Loch Awe"
    1968 Selmer Series 9 B-flat and A clarinets
    1962Buesher "Aristocrat" tenor saxophone
    Piper One Design 24, Hull #35; "Alpha"

  5. #125
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    I don't know what the SHTP requires. IMO it depends if you're getting ready for one two-week race to Hawaii, or you're planning to race the boat for awhile. When racing on the Bay, I like to see how SOG and boat speed compare so I know how the current is affecting me.

    If you decide you want to see boat speed but don't want another hole in the hull, consider an ultrasonic transducer. You might even build one yourself.

  6. #126
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    Quote Originally Posted by BobJ View Post
    I don't know what the SHTP requires. IMO it depends if you're getting ready for one two-week race to Hawaii, or you're planning to race the boat for awhile. When racing on the Bay, I like to see how SOG and boat speed compare so I know how the current is affecting me.

    If you decide you want to see boat speed but don't want another hole in the hull, consider an ultrasonic transducer. You might even build one yourself.
    I know about doing the SOG and STW thing to figure out current effects, but realistically, will I use it? I might. If the Wildcat were coming home from Hawaii with me, then it'd be a no-brainer, but she's not. It makes no sense to pay $10,000 to ship a $6,000 boat back from Hawaii. So I'd be buying a $250 knotmeter to do...

    Possibly the WestPoint Regatta, this summer, if it's held.
    Half Moon Bay SSS race, 2020.
    An offshore 400 mile qualifier in September
    Vallejo 1-2, 2020


    Maybe the 3BF in January 2021
    Round the Rocks SSS, 2021
    Corinthian race SSS 2021
    Singlehanded Farallones, SSS 2021

    and then the 20201 SHTP... That's nine events, for which I have to spend $250 for the knotmeter and probably $350 for the haulout to install it.

    Now....ARE there "ultrasonic" knotmeters? If there are, I can't make one, my expertise is with wood, epoxy and string, not circuity!
    S-2 7.9: "Wildcat of Loch Awe"
    1968 Selmer Series 9 B-flat and A clarinets
    1962Buesher "Aristocrat" tenor saxophone
    Piper One Design 24, Hull #35; "Alpha"

  7. #127
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    Just trying to help, Alan.

  8. #128
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    It just says "knotmeter" whereas the depth sounder rule reads "permanently installed".
    Maybe just buy a Knotstick and call it good.
    http://knotstick.com/

  9. #129
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    Quote Originally Posted by BobJ View Post
    Just trying to help, Alan.
    I know!! But seriously, do you know of a speedo / knotmeter that doesn't NOT require a through hull fitting? 'cause I'm all over it, if you do! There are plenty of transom-mount ones of course, but...ahhh..
    S-2 7.9: "Wildcat of Loch Awe"
    1968 Selmer Series 9 B-flat and A clarinets
    1962Buesher "Aristocrat" tenor saxophone
    Piper One Design 24, Hull #35; "Alpha"

  10. #130
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    Quote Originally Posted by everydaysailor View Post
    It just says "knotmeter" whereas the depth sounder rule reads "permanently installed".
    Maybe just buy a Knotstick and call it good.
    http://knotstick.com/
    I totally forgot about the knotstick. I had one years ago and it was reasonably accurate, if you towed it for a couple minutes and glanced over 5-6 times and took an average.
    S-2 7.9: "Wildcat of Loch Awe"
    1968 Selmer Series 9 B-flat and A clarinets
    1962Buesher "Aristocrat" tenor saxophone
    Piper One Design 24, Hull #35; "Alpha"

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