[C38] speed. GPS is lots better than wheel

Tom T. tdtron at earthlink.net
Fri Jan 14 09:56:16 EST 2011


I like using both the knotmeter and the GPS.

Coming in and out of Tampa Bay can be a real thrill when you need to maintain a schedule, like getting crew back to the airport on time.

The GPS is very accurate but doesn't tell squat about boat speed through the water.  I've seen 5kts on my knotmeter and zero on the GPS when we were sailing back beating against an outgoing tide.  I like to know both speeds, VMG as well as water speed when I'm trying to calculate my progress and my own tuning performance.

Tom T.

----- Original Message ----- 
From: Don Strong 
To: listserve at catalina38.org
Sent: 1/14/2011 9:09:12 AM 
Subject: Re: [C38] speed. GPS is lots better than wheel


We did tests of our Signet paddle wheel versus several GPS over measured courses with stop watches etc. The wheel was inconsistent, faster and slower than the GPS. The GPSes matched each other as perfectly as we could record and exceeded the precision we could muster with stop watches. No contest. We quit after a few tries and had a beer.  My pal was a VP at Magellan, and predicted the outcome. He still teases me about it. 
Don

On 1/13/11 7:46 PM, Steve Smolinske wrote: 
Does anyone have any knowledge on the location of the knot meter on the centerline?  Peregrine is in the yard having mushroom mounts removed and replaced with flush mounts.  I instructed in writing to the yard along with a photo to place the knot meter on centerline 33% of the distance from the keel to the waterline entry point.  They have placed it 1' in front of the keel and stated that is the perfect location and any further forward it will be subject to disturbance from the bow wave.  (yes they went ahead without contacting me first)   We are going to talk about it tomorrow morning and Im hoping someone has some definitive information I can use. Grrrr  Thanks

Steve
#312 Peregrine
Seattle
  

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-- 
Donald R. Strong
Professor
Dept. of Evolution and Ecology
University of California, Davis 95616
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