[C320-list] Boat Speed
Orlando.Duran at AveryDennison.com
Orlando.Duran at AveryDennison.com
Tue Apr 25 15:53:32 PDT 2006
Two boats, side by side, one boat trimming to knot meter, other boat trimming to GPS, boat using the knot meter will pull ahead 90% of the time...
cuba libre 2
--------------------------
Regards,
OD
Sent from my BlackBerry Wireless Handheld
----- Original Message -----
From: C320-List-bounces
Sent: 04/25/2006 03:48 PM
To: C320-List at catalina320.com
Subject: Re: [C320-list] Boat Speed
OK, understand your point---next time on the water will compare boat trim speed increase on knotmeter vs. GPS, plus GPS lag time. Interesting.
Len
-----Original Message-----
From: Orlando.Duran at AveryDennison.com
To: Catalina 320 List <C320-List at catalina320.com>
Sent: Tue, 25 Apr 2006 15:37:44 -0700
Subject: Re: [C320-list] Boat Speed
SOG info is from one point to another, info is usually at least 20-30 seconds
old....something you do to trim or adjust, won't register as a boat speed
improvement (if any) for that length of timen conversely, with a know meter,
since the info is thru-the-water, results are instant so you have a much better
sense of what's working and what's not right away...
cuba libre 2
--------------------------
Regards,
OD
Sent from my BlackBerry Wireless Handheld
----- Original Message -----
From: C320-List-bounces
Sent: 04/25/2006 03:30 PM
To: C320-List at catalina320.com
Subject: Re: [C320-list] Boat Speed
Please explain relation of knot meter to correct boat trim, I'm not familiar
with difference to GPS sog.
Thanks,
Len
-----Original Message-----
From: Orlando.Duran at AveryDennison.com
To: Catalina 320 List <C320-List at catalina320.com>
Sent: Tue, 25 Apr 2006 15:16:03 -0700
Subject: Re: [C320-list] Boat Speed
Well, if you do any sort of racing--PHRF or Cruising--you cannot ignore knot
meter, that's the only way of knowing if any trim/adjustment is working. A knot
meter, correctly calibrated, is just as accurate but used for a different
reason. Igonoring a knot meter completely will never allow you to have your boat
in correct trim...
cuba libre 2
--------------------------
Regards,
OD
Sent from my BlackBerry Wireless Handheld
----- Original Message -----
From: C320-List-bounces
Sent: 04/25/2006 03:09 PM
To: C320-List at catalina320.com
Subject: Re: [C320-list] Boat Speed
I totally ignore the speed instrument, and rely on GPS sog (speed over ground)
readout on chartplotter at the helm which I understand IS accurate (unless
satellite changes orbit or you're suddenly over the Marianas Trench). Wonder
how many 320's have GPS at this time?
Len
Aqua 5 #1070
-----Original Message-----
From: Walter burnett <selkie2003 at yahoo.com>
To: C320-List at catalina320.com
Sent: Tue, 25 Apr 2006 14:56:23 -0700 (PDT)
Subject: [C320-list] Boat Speed
All,
It occurs to me the many variations in reported boat speed is likely due to
variations in the speed sensor calibration, or lack thereof. The only accurate
way to calibrate the boat speed sensor is by timing multiple passes ata a
constant speed through a measured course in slack water and opposite directions.
Average the runs, calculate the speed and compare it to the readout for a
correction factor to enter into the display. The more and longer the runs, the
more accurate the calibration.
In my experience the speedo out of the box can be off as much as 25%. I
suspect most boat dealers don't make any effort to calibrate the instruments
before delivery and many skippers either don't know or don't bother.
Walter
Selkie #887
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