[bolger] Humpback whales and Vindication
Roger,
I have long thought that the shark is one of the fastest movers in the sea,
and its skin is very rough, so why do our boats have to have a surface like
a piano top?
I seem to remember an article in Yachting Monthly some 40 years ago, which
reckoned that a matt paint finish on a hull made for a faster boat than one
done out with gloss paint.
Alvan.
I have long thought that the shark is one of the fastest movers in the sea,
and its skin is very rough, so why do our boats have to have a surface like
a piano top?
I seem to remember an article in Yachting Monthly some 40 years ago, which
reckoned that a matt paint finish on a hull made for a faster boat than one
done out with gloss paint.
Alvan.
This month's Flying magazine has a short article citing the work of
researchers at West Chester University, Duke University, and the U.S. Naval
academy as reported in the journal, Physics of Fluids.
It seems the humpback whale has really ugly flippers. The leading edge
looks like a very badly sharpened bread knife (major scallops of irregular
sizes). Wind tunnel tests found it to have 8 percent more lift and 34
percent less drag than a flipper with a smooth leading edge. It also
stalled at a 40 percent steeper angle.
My rough construction now has a scientific alibi. I'm going to have to make
the leading edge of the centerboard even more uneven.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
researchers at West Chester University, Duke University, and the U.S. Naval
academy as reported in the journal, Physics of Fluids.
It seems the humpback whale has really ugly flippers. The leading edge
looks like a very badly sharpened bread knife (major scallops of irregular
sizes). Wind tunnel tests found it to have 8 percent more lift and 34
percent less drag than a flipper with a smooth leading edge. It also
stalled at a 40 percent steeper angle.
My rough construction now has a scientific alibi. I'm going to have to make
the leading edge of the centerboard even more uneven.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
----- Original Message -----
From: "David Ryan" <david@...>
To: <bolger@yahoogroups.com>
Sent: Thursday, September 01, 2005 5:42 PM
Subject: Re: [bolger] Re: Amherst Galley
On Sep 1, 2005, at 12:02 PM, Bruce Hallman wrote:
>
> With shop grade plywood, and an airpowered stapler,
> [and no fiberglass sheathing]...
Part of what I said to Phil and Suzanne was that I wanted something
fast enough and cheap enough to build that I would feel I'd thrown my
money away by using the cheapest materials and quickest methods
available - little camper for next Summer on Gardner's Bay.
However, since our trip to CBI, I've seen the potential for a well-made
Amherst Galley to make our next trip up there truly spectacular. A
cheaply build one would be fun too, just not as much.
> Please refresh my memory of more precisely what
> an Amherst Galley is? Scans or photos, and/or written
> description?
The Galley is an oversized Birdwatcher with a schooner rig. Her name is
derived from the school who commissioned the design (The Amherst Public
School in Canada) and the eight row positions (to be manned by
energetic adolescents) that provide her auxiliary power. (She's meant
to accommodate six on overnight trips.) In many respects she's a
smaller, plywood, centerboard version of the schooner rigged
Berengaria.
YIBB,
David
[Non-text portions of this message have been removed]
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