RE: [WWP] Re: P19 keel weight (was Have the "keel" galvanized?)

From: Ken Preston (preston@gencc.com)
Date: Thu May 11 2000 - 15:30:51 PDT


Hi. Ordinary Steel and most steel alloys weigh really close to 30 pounds
per square foot for 3/4" plate (easier to remember as 10 pounds per square
foot for 1/4" plate. . .which is accurate to a a few thousandths. . .)so if
it were dead flat, no fairing and no added metal it would come in at 210
pounds. If it were 7/8" plate it would be 245.
Ken Preston. . .who's never even seen a P-19 keel!

-----Original Message-----
From: Mac Davis [mailto:mcmd@innet.com]
Sent: Thursday, May 11, 2000 1:36 PM
To: Potter Email List
Subject: [WWP] Re: P19 keel weight (was Have the "keel" galvanized?)

Hi Judy:
Your reference to a 390# keel tripped a trigger. We had this discussion a
couple of years ago, and the concensus was that there was no way the
standard P19 sheet steel keel (48 x 21 x 3/4 before milling) could meet its
advertised weight. Since Kelpie's keel is removed at the moment, I hauled
my trusty Sunbeam bathroom scale down to the garage and used it to weigh the
keel. My keel weighs 255 pounds (± 3 as I moved it around on the scale.)
Since this scale has been verified accurate at 202 lbs by a doctor's beam
balance, I am confident that it was an accurate test.

Mac Davis
Kelpie, WWP19#804
Aripeka, FL

<snip> What I did with my 390#
> "lifting keel" on the P19 -- get the boatyard to drop it and let two of
> their guys put it on a saw horse for me. I cleaned up the nicks, smoothed
> the bottom where I ground it up on the "ramp" and re-epoxied. Then I put
a
> coat of Micron CSC anti-fouling on it. I let the strong guys put it back
in
> the boat for me and installed a new steel cable while I was at it.
<snip>

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