I Don't know much about this but it seems to me that
you are looking for places where the boundary layer is lifted away from the
car. So splotches of light grease in a pattern over the area in question ought
to work. Those that didn't smear out are areas to look at, me I'm not smart
enough to have much of an idea what to do about it so it would be just so much
useless information . Kvach
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From: John Beckett[SMTP:johnbeck@blueridge.cc.nc.us]
Sent: Monday, July 12, 1999 10:49 AM
To: Chuck Rothfuss; Land-speed@autox.team.net
Subject: Re: YARN
Don't know, but when they run cars in the wind tunnel they blow the air
through as fast as it will go. Generally 150 to 180 MPH. so just
extrapolating I'd say that the higher speed air does make a difference.
JB
At 01:18 PM 7/12/99 -0400, Chuck Rothfuss wrote:
>At 06:17 AM 7/12/99 -0700, Dick J. wrote:
>>
>>*SNIP* Your big challenge
>>there is going to be to get somebody close enough
>>to the track to video tape it for you - or to
>>find big enough of a telephoto lense to tape it.**END**
>
> My big question now is how much different is the air flow gonna be at 180
>MPH, compared to say 65 MPH? Sure, there's a lot more of it, but if you go
>fast enough to make the yarn or mylar tape move into the air flow wouldn't
>that be fast enough? Keith?
>
> Getting it down to a reasonable speed like that would allow a second
>vehicle to be safely driven along side. With a few passes of the sweeper at
>Maxton you could get Lionel to pace you in the van, with Banjo running the
>video camera.
>
> As Dick mentioned, the yarn method seems to have an advantage over
>liquids, since it'll show where air is rising as it crosses the cars surface.
>
>Chuck
>
>
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