[Rhodes22-list] Fw: Bob Weber's Analysis Of Lee Helm

[Eaton, Gil]

	I think Mary Lou has it narrowed down when she mentioned:

	"The centerboard appears to drop cleanly and not bind or thump about

significantly but we've never taken a really good look at it. Fretless has 
an unusual repair (?) to her centerboard trunk (there is a flat plate 
glassed over the forward part of the trunk - between the trunk and the 
centerboard cap) that prevents us from removing the centerboard in the 
usual fashion)."

	I would look at the repair, my guess is that the pin may not be
aligined.  Perhaps a test with the centerboard up?
	gil
Gil Eaton
S/V Dream Catcher
Spring Cove Marina
Rock Hall, MD


-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org]On Behalf Of Roger Pihlaja
Sent: Friday, September 17, 2004 9:56 AM
To: The Rhodes 22 mail list
Subject: [Rhodes22-list] Fw: Bob Weber's Analysis Of Lee Helm


Mary Lou,

One thing I forgot to mention in my previous post.  In order for Bob's
push/glide test to work properly, your hull must be absolutely level on the
waterline from side-to-side.  If the hull is heeling to one side or the
other in the push/glide test; then, there will be an asymmetry in the
underwater shape that will cause the glide to consistently veer in one
direction.  This consistent veering will occur even in the absence of any
problems with shoal draft keel shape &/or alignment and could lead to a
false positive in the test.

Note that if you do get a positive result in the push/glide test; then, you
can also test to see how many degrees of heel are required to cancel out the
veering effect.  You could do this by shifting ballast around to set the
degrees of heel to whatever was required & then repeating the push/glide
test.

Roger Pihlaja
S/V Dynamic Equilibrium

----- Original Message ----- 
From: Roger Pihlaja 
To: The Rhodes 22 mail list 
Sent: Friday, September 17, 2004 9:35 AM
Subject: Bob Weber's Analysis Of Lee Helm


Bob,

Given the way the hull & shoal draft keel are molded together in one piece,
it's hard to understand how the shoal draft keel could be misaligned or
misshaped.  However, your suggested diagnostic test involving pushing the
boat & noting a definite tendancy to veer one direction or the other during
the glide seems quite definitive.  Plus, it has the advantage of being
simple & quick.  If there is something crooked down there, your push/glide
test will point it out.  If your push/glide test shows no definite tendency
to favor one direction over the other; then, all the hypothesis regarding
hull & keel shape &/or misalignment can be put to rest.  I wonder if the GBI
factory has something akin to a "Go/No Go" gauge for shoal draft keel shape
& alignment?

Roger Pihlaja
S/V Dynamic Equilibrium 
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