[Public-List] Diesel conversion

[jon]

As I said in the original statement: "Mis-timed".  DODD Narrows certainly is 
a narrow passage, subject to varying current directions and flow rates. I 
should also explain that on the day in question, a lot turbulence and wave 
action was being thrown up by quite large and very enthusiastic power 
boaters just to add to the excitement. And the contrary forces acting on the 
EMMY. To the gentleman who suggested that I might as well get a Powerboat: I 
don't want a powerboat. I sail as much as possible, but I REALLY appreciate 
the engine when I need it. So does my wife! Jonathan. EMMY(boat- not wife)
----- Original Message ----- 
From: "John Riley" <jriley at dsbscience.com>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Sent: Thursday, November 11, 2010 5:13 AM
Subject: Re: [Public-List] Diesel conversion


> jon wrote:
>>  to go through the Dodd Narrows against a six knot min imum current.
>>
>
> I see this kind of comment all the time, and I am genuinely curious.
>
> If my 8 HP outboard can push the boat at hull speed (a touch over 6
> knots) through the water, isn't that "adequate" by any practical
> definition (wait, I'm not conflating outboard HP with diesel HP).  Hull
> speed is hull speed once I reach it, and my speed over ground is
> determined by the current, not the HP of my mechanical propulsion.
>
> I've motored into a 25 knot headwind against a 2-3 knot tidal
> current...with a speed over ground (as measured by GPS) a touch over 3
> knots.  That seems about right to me for making hull speed (or near
> enough), so I'm failing to understand how extra horsepower would have
> made any difference.
>
> I do concede the point that bigger winds may demand more HP; but speed
> through the water is the same whether the water is moving or not.
>
> And finally, does Dodd Narrows have that flow ALL the time?  No Slack
> Water, no Flood/Ebb cycle?
>
> -- 
> John S. Riley
> S/V Gaelic Sea
> 1972 Alberg 30 #521
>
> _______________________________________________
> These businesses support your Association:
> http://www.alberg30.org/store/A30supporters.html
> Please support them.
> _______________________________________________
> Public-List mailing list
> Public-List at lists.alberg30.org
> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> 



 1289516625.0