Pork Pie;
Perhaps the difference (6 vs 7 degrees departure angle) is due to the
assumed air density differences of the automotive vs aircraft applications?
Regards, Neil Tucson, AZ
-----Original Message-----
From: pork.pie@t-online.de [mailto:pork.pie@t-online.de]
Sent: Sunday, January 05, 2003 8:54 PM
To: Nafzger; answer landracing
Subject: Re: Aerodynamics
Howard, you be right, when you say that one degrees make NEARLY NO
different. When you go from 6 to 7 degrees, the positive effect of the 7
degrees is smaller than the 6 degrees.
You can read all this in a bigger book, written from Willibald Kamm, based
on investigations which was done by Kamm and Reinhard von
Koenig-Fachsenfeld. Reinhard was the real innovator in aerodynamic, but Kamm
got the Patent on all the aerodynamic laws (by order of the Third Reich
bosses). I don't know if this book was ever published in English. I got the
luck that 20 years ago I got the chance to read a very old copy (owned by
the University of Stuttgart-Vaihingen, there where Willibald worked). There
is no explaination where the different comes from, but all the graphics and
mathematic results showed the different.
May be the reason, that in the most aerodynamic books there is no
information about, due to this that they are normally specialized on
automotive or on aeroplane.
By the way, I remember that you agreed to the 6 degree rule, when we
discussed this at Black Rock in 1997.
Sorry, I never got a chance to make a copy from this book and also I never
saw (later) a copy of this book again.
All the best
Pork Pie
"Nafzger" <nafzger@vtc.net> schrieb:
> List,
> I have been pondering the discussion from yesterday and I am puzzled about
> something. I have six different books on AUTOMOTIVE Aerodynamics from the
> SAE and other credible sources and I have not seen any reference to 6
> degrees being ideal for land based vehicles and 7 for aircraft. I have
> trouble believing all these people are living in a fog bank.
> Does anyone have a reference to where I can read that. It's a small point
> and one degree will make no difference with all the variables we have to
> deal with but I need to know if all these competent people are wrong.
> Howard Nafzger
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