In a message dated 10/23/2008 10:26:38 A.M. Pacific Daylight Time,
N197TR4@cs.com writes:
Joe
I think you overlooked a very important point in the previous email
below about the use of crankcase oils.
Clearly, the Triumph engineers intended our cars to leak crankcase
oil so that we could study the under carriages aerodynamics. I wonder what
other revelations we will be able to find out in the future?
Cary
Just a comment......
In the late 50s, Jim Bede, used tiny perforations in the flying surfaces in
order to control laminar flow. Not very cost effective at the time, but
with
modern manufacturing methods, it might be more feasible. Maybe it wasnt even
functionally effective, but an interesting idea.
F-1 and others have may have pursued this, but I wonder about that, too.
Jim Bede was the originator the BD-5 & BD 5J microjet used in the Bond
Movies and one was also owned and flown by Richard Bach....(Jonathon
Livingston
Seagull).
> FYI - Response from a retired Aeronautical Engineer friend of mine that
I
> shared your interesting, the state of F1, conversation. Thought you might
> appreciate his words on the subject.
> Bob Johns
>
> ----- Original Message -----
> From: Gregory Foster
> To: Robert Johns
> Sent: Thursday, October 23, 2008 11:18 AM
> Subject: Re: Fw: Fot Digest, Vol 23, Issue 44
>
>
> Aero and hydro dynamics are always interesting subjects which I could
> talk at length on because I spent the last 15 years of my career dealing
with
> them when we were building high speed underwater vehicles. Also since my
> hobby is flying sailplanes, it is a constant topic of conversation along
with
> "secret" airfoils and "secret" wing finishes to either eliminate or at
least
> carefully control transitions from laminar to turbulent flow. Most of it
is
> BS
> but some is not. A recent development suggests there may be a new one
coming
> along. see http://www.standardcirrus.org/ A technique used in gliders is
to
> smear used crankcase oil that is good and black along a 2 foot section of
a
> wing and then go fly the plane and see how the oil streaked off the wing.
> The
> location ( cordwise) of any transition to turbulent airflow is very
visible
> in the remaining oil smears. Then we know where to place strips of
> "deturbulator" tapes.
>
> I have been through several classes on turbulence including the
> Mendelbrot techniques discussed in the Fot. He is a math genius and his
> theories of "Chaos", when applied to turbulence result in very strange
> phenomenal (in theory). As a personal hobby project I tried very hard to
> apply some of his theory to stock market analysis (if that isn't chaos,
what
> is?) and it will take someone smarter than I am to produce something
useful.
> I could show that his theory applies to the market but I wanted a form of
> predictor and failed to get such a result. It is called "looking for a
> "strange" attractor". The word strange has a definite, specific meaning in
> his theory.
>
> Greg
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