[C320-list] Knotmeter knot working

[Lamar Desmond]

We have Raymarine Speed, Wind, GPS, Color Chart plotter (SL631); when the
paddle wheel is gunked-up and not spinning we don't get true wind speed or
direction.  I agree that it shouldn't be necessary but seems to be the case
with our setup; maybe due to an older GPS/Chart plotter.

We always put the plug in when leaving the boat for a few days; in Annapolis
I pull it even for an overnight.  We keep an old tooth brush (thanks to the
PO Joe the dentist)in the bilge next to it for cleaning.

Lamar Desmond
Blue Moon #358
Worton Creek, Md

-----Original Message-----
From: c320-list-bounces at catalina320.com
[mailto:c320-list-bounces at catalina320.com] On Behalf Of Crosby Roper
Sent: Wednesday, November 28, 2007 9:46 PM
To: C320-List
Subject: Re: [C320-list] Knotmeter knot working

Allan,
 
Your GPS gives you speed over ground which may differ significantly from
your speed through the water which your knot meter provides, especially when
sailing in strong currents. I think you should still get accurate true and
apparent wind readings which are calculated based on wind direction, wind
speed, boat heading, and boat speed over ground, not speed through the
water.
 
Crosby Roper
tethys # 1054 



> From: Allan.Field at comcast.net> To: c320-list at catalina320.com> Date: 
> Wed, 28 Nov 2007 20:51:41 -0500> Subject: Re: [C320-list] Knotmeter 
> knot working> > Bill - Sea Shadow's hull knotmeter has never seen 
> water. We have the> complete Raymarine SeaTalk instrument system 
> including color chart plotter> so this gives us boat speed. I believe 
> that the only thing missing by not> having the knotmeter in is being 
> able to read true wind but apparent wind> works for our needs as we 
> don't race. Where we are on the Chesapeake Bay,> the knotmeter on my 
> old boat had to be cleaned every week. Once I got GPS,> I never used 
> the old knotmeter again either.> > Allan S. Field> Sea Shadow - #808> 
> Columbia, MD> > -----Original Message-----> From: 
> c320-list-bounces at catalina320.com> 
> [mailto:c320-list-bounces at catalina320.com] On Behalf Of Bill Sloane> 
> Sent: Tuesday, November 27, 2007 10:53 PM> To: 
> c320-list at catalina320.com> Subject: [C320-list] Knotmeter knot 
> working> > Forum:> > Having never owned a boat with a through hull 
> knotmeter, I am not clear how> to fix one. It was not working this 
> past Sunday when I went out for a> chilly but beautiful sail. A 
> colleague at work told me that I need to> unscrew the fitting in the 
> V-berth sump, and immediately screw in the spare> fitting that is 
> tethered there. Is this in fact how you do> it? Isn't that opening a 
> hole in the hull below the water line?> > I am pretty sure a 
> crustacean or other volunteer has made a home up in the> little fly 
> wheel that needs to be dislodged. Can I do this by entering> through 
> the sump?> > Appreciate any advice.> > Bill> C-320 'Endless Summer', 
> No. 554> Olympia Washington> >
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