Re: FWD: Coyote Alert

From: Matt Yamamoto (matt@cup.hp.com-DeleteThis)
Date: Tue Oct 27 1998 - 15:33:41 PST


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To: wind_talk@opus.hpl.hp.com-DeleteThis
Cc: Paul Catz <paulcatz@unix.SRI.COM-DeleteThis>, David Ahlberg <ahlberg@mathcs.sjsu.edu-DeleteThis>, Kyle Welch <kwelch@us.ibm.com-DeleteThis>, The Goat Man <Feferman@Haas.Berkeley.Edu-DeleteThis>, Jon Berman <berman@cisco.com-DeleteThis>
Subject: Re: FWD: Coyote Alert 
In-Reply-To: Your message of "Mon, 26 Oct 1998 13:56:22 PST." <199810262156.NAA12369@wallach.cup.hp.com-DeleteThis> 
Date: Tue, 27 Oct 1998 15:33:41 -0800
From: Matt Yamamoto <matt@cup.hp.com-DeleteThis>


I talked to a friend who once told me some information about how
big a wind shadow an object of a certain height throws up. Here's
his response:

        Well, I went home and looked at "Sailing Theory
        and Practice" by C A Marchaj, p. 387. It wasn't
        the reference I remembered, but it gave
        the wind shadow for trees as being anywhere
        between 4 and 20 times the height - I assume
        the variation is due to the wind speed, which
        changes the Reynolds number.

So a wind shadow of up to 20 times the height of an 11 story
building could be significant. Doing the math:

        11 stories * ~10 ft/story * 20 (times the height) = 2200 ft

or a wind shadow of about .42 miles. Even a 7 story building could
throw up a wind shadow over 1/4 mile long.

-matt

> Date: Fri, 23 Oct 1998 13:02:37 -0700
> From: Rick Weiss <rickw@nablewest.com-DeleteThis>
> To: wind_talk@opus.hpl.hp.com-DeleteThis
> Subject: Re: Coyote Alert
> Message-ID: <3630E0DD.435C@nablewest.com-DeleteThis>
>
> Martin Frankel wrote:
> [snip]
> > This is all speculation, I don't really know the first thing about the
> > physics involved. If anyone has better knowledge of this or perhaps
> > references, I think it would be very interesting. Still, the first
> > priority is to get the issue on the table... send those letters!
>
> I'm confused. We cannot decide whether these buildings would REALLY
> affect our launch, but we should fax those letters, which say they
> would "severely impact, and possibly destroy" our launch. I agree
> this could be a significant problem, but I'd hate to cry wolf.
>
> (I'm trying to picture standing in the parking lot, and mentally
> place the proposed buildings. They don't seem to be directly upwind.
> Does anyone have a map, where they could plot the proposed buildings,
> and draw a line at 260 degrees --- the point where it starts to become
> too southwest-- to see where that hits Coyote point?)



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