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post #41 of 47 Old 05-07-2012
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Re: Dead Reckoning

I am also among the old codgers that grew up with dead reckoning. We used to sail from south Florida to the Bahamas with a table that we would make showing the different courses to steer as our speed changed with conditions. We'd usually sail at 120 degrees to make good 90 degrees to West End from Lake Worth at five knots. If we increased speed we could make 110 degrees. Of course, our actual course only used the average vector of the Gulfstream so we layed a sigmoid curve that GPS removes. Our back-up was a handheld RDF that would pick up mostly airport morse code signals at any bearing except pointed directly to or 180 degrees from the station. Others have asked about the steering errors without an autopilot, but the port or starboard errors tend to cancel out each other over time. Our accuracy was always more at risk heading to the small islands while the return to Florida was hard to miss. Some, though , did make big errors. I remember coming into Port Canaveral just behind another whose captain thought he was at West Palm,......big mistake! If he had been eastbound he would have missed everything! Take care and joy, Aythya crew
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post #42 of 47 Old 05-07-2012
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Re: Dead Reckoning

Casey

You simply loosen the retaining cap that holds the knotmeter in the thru-hull, then use the ring to remove the knotmeter. Insert the blank into the thru-hull and tighten the cap. Clean the thru-hull. I have someone watch the knotmeter as I spin the paddles on the knotmeter.

To replace, unscrew the retaining cap and pull out the blank. Insert the knotmeter, ensuring that it faces the right direction (there is an arrow). Replace the cap and tighten it to hand tight.

It is no problem.

If you want me to show how to do it, I will be in Lahaina from July 27-July29 prepping a Vic Maui boat for delivery back to Vancouver.

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post #43 of 47 Old 05-07-2012
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Re: Dead Reckoning

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Originally Posted by Capt Len View Post
Casy, that was called a taff rail log. You guessed it , mounted on the taff rail. Sharks can eat the prop so carried spares. Going into reverse could also eat em up.
Did one trip direct from Maryland to Carribean. The skipper used the "Taff log". We did loose one approx 10 inch diameter propeller- we assumed a shark at it, but did have two spares.
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post #44 of 47 Old 05-07-2012
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Re: Dead Reckoning

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Casey


If you want me to show how to do it, I will be in Lahaina from July 27-July29 prepping a Vic Maui boat for delivery back to Vancouver.
Thanks for the offer. I am on Oahu, otherwise I would take you up on that.
Regards
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post #45 of 47 Old 05-07-2012
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Re: Dead Reckoning

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I am also among the old codgers that grew up with dead reckoning. We used to sail from south Florida to the Bahamas with a table that we would make showing the different courses to steer as our speed changed with conditions. We'd usually sail at 120 degrees to make good 90 degrees to West End from Lake Worth at five knots. If we increased speed we could make 110 degrees. Of course, our actual course only used the average vector of the Gulfstream so we layed a sigmoid curve that GPS removes. Our back-up was a handheld RDF that would pick up mostly airport morse code signals at any bearing except pointed directly to or 180 degrees from the station. Others have asked about the steering errors without an autopilot, but the port or starboard errors tend to cancel out each other over time. Our accuracy was always more at risk heading to the small islands while the return to Florida was hard to miss. Some, though , did make big errors. I remember coming into Port Canaveral just behind another whose captain thought he was at West Palm,......big mistake! If he had been eastbound he would have missed everything! Take care and joy, Aythya crew
A few weeks back I was looking for a radio direction finder (used to be pretty common on boats), could not find a new one. Guess I gotta try ebay.
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post #46 of 47 Old 05-07-2012
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Re: Dead Reckoning

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A few weeks back I was looking for a radio direction finder (used to be pretty common on boats), could not find a new one. Guess I gotta try ebay.
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post #47 of 47 Old 05-07-2012
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Re: Dead Reckoning

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The plug is the same material and diameter as the knotmeter. It is held in place by the same threads as the knotmeter. I pull knotmeters regularly to show my students how it is done.

Check the video I posted for other techniques.
Interestingly enough on another thread, this interview with the skipper was posted in March which outlined where almost this exact situation happened during last year's NARC in Swan 48.

NARC Rally Nightmare 2011, Part 1 - An interview with captain AJ Smith from Swan 48 Bella Luna - YouTube

Discussion on thru hull at about 7:15 of video.

They lost the engine and all electronics as a result.

Lots of other good stuff in the interview on their storm management and decisions.



Why are people happy to accept science which makes their life easier while rejecting science that makes their faith or beliefs more difficult?


Last edited by cupper3; 05-07-2012 at 09:46 PM.
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