Re: [bolger] depth of keel
According to PCB, the basic idea behind a deep keel is that the water near
the surface is moved by the wind. A deeper keel is needed to make
significant progress upwind. This is more significant off-shore in the
ocean than it is in your local lake or river.
Roger
derbyrm@...
http://derbyrm.mystarband.net
the surface is moved by the wind. A deeper keel is needed to make
significant progress upwind. This is more significant off-shore in the
ocean than it is in your local lake or river.
Roger
derbyrm@...
http://derbyrm.mystarband.net
----- Original Message -----
From: "Jeff Comfrey" <mike78612003@...>
> what about adding small keel to the flat bottom say just 3 inches deeper
and two or three inches wider for the whole length. would that be enough to
provide good lee drift control or does the keel always have to be so deep to
be of a real use
I remember seeing somewhere that the underwater lateral area should be
around 4-6% of sail area. Maybe somebody can confirm this for the group.
Without knowing the specifics of your design, I can't say whether or not it
will be enough. Judging from the dearth of designs with this type of keel,
I'd say it hasn't been sufficiently perfected to have become very popular.
The only boat I can think of that even comes close to this concept is
Conrad Natzio's 'Shoveler', an Auray-type punt with moderately shallow bilge
keels. Don't know how it performs compared to a more conventional set-up.
JB
around 4-6% of sail area. Maybe somebody can confirm this for the group.
Without knowing the specifics of your design, I can't say whether or not it
will be enough. Judging from the dearth of designs with this type of keel,
I'd say it hasn't been sufficiently perfected to have become very popular.
The only boat I can think of that even comes close to this concept is
Conrad Natzio's 'Shoveler', an Auray-type punt with moderately shallow bilge
keels. Don't know how it performs compared to a more conventional set-up.
JB
----- Original Message -----
From: "Jeff Comfrey" <mike78612003@...>
To: <bolger@yahoogroups.com>
Sent: Friday, October 31, 2003 11:41 PM
Subject: [bolger] depth of keel
| what about adding small keel to the flat bottom say just 3 inches deeper
and two or three inches wider for the whole length. would that be enough to
provide good lee drift control or does the keel always have to be so deep to
be of a real use
|
|
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what about adding small keel to the flat bottom say just 3 inches deeper and two or three inches wider for the whole length. would that be enough to provide good lee drift control or does the keel always have to be so deep to be of a real use
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