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Mobile Geographics MapTap for PalmOS CelestNav for PalmOS IQ Booster for iQue 3600 SJ23 sailwx.info tides

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Re: Sj23 Tech Tips




thanks for your explanation...
 Maureen
----- Original Message -----
From: <WPBest@xxxxxxx>
To: <sanjuan23@xxxxxxxxxxxxxxxxxxxxx>
Sent: Thursday, August 16, 2001 11:29 PM
Subject: Re: Sj23 Tech Tips


> Never raise your keel unless you are planning to beach your craft.[or run
> aground, or of course, trailer your boat.] The keel is a foil, and as such
it
> is always a component in the boats handling. In all do respect to Mr.
Attig,
> a sideslip in an aircraft is accomplished with no foils retracted. That
is,
> with the rudder in the opposite direction to the bank imput of the
ailerons.
> The effect he is commenting on would never be possible without the direct
> opposition of the airfoils which counteract each other and produce a large
> amount of drag with a [somewhat] corresponding amount of lift. Directional
> control is still there, but is a function of all three control surfaces.
The
> same thing occurs in a sailboat with two foils in the water. It is just a
> matter of fluid dynamics. Windage, which he correctly states is a problem,
> will only be aggravated by retracting the keel. The keel acts as a
stabilizer
> against windage and will serve as a dampening device in beam windage
> situations. I hope that I have now confused everyone. I just could not let
> that go without a responce. Have a good weekend everyone.
>                                   William Best
>
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