Rudder Turbulator Strips

Tue Apr 15 12:56:42 AKDT 2003

In the 60s, the prototype road racers went from cars with a teardrop
shaped tail to one that was chopped off abruptly.  I believe they
started this from LeMans because the back straight was about 3 miles
long and very straight at that time.  The Porsche 904-910 (I think) had
a chopped of tail.

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of John Ferrell
Sent: Tuesday, April 15, 2003 3:42 PM
To: discussion at nsrca.org
Subject: Re: Rudder Turbulator Strips

There were several who objected that the blunt trailing edge resulted in
more drag than a sharper edge.
I felt that the blunt edge was easier to construct and maintain
uniformly
and that drag was not much of
a consideration on this particular model. Somewhere I read that racing
sailboats had blunt training edges
on the rudder to reduce the tendency of the surface to "hunt" under
light
loading. I don't have any scientific
evidence to support that but Dave Guerin also liked blunt trailing edges
so
we kept the recomendation.

I would not know where to start to find the equations to support either
side
of the argument,
If you can't quantify it, you really don't understand it,
Therefore I really don't understand it.
Howerver, I do prefer it!

----- Original Message -----
From: "Dean Pappas" <d.pappas at kodeos.com>
To: <discussion at nsrca.org>
Sent: Tuesday, April 15, 2003 3:00 PM
Subject: RE: Rudder Turbulator Strips

Why?
Dean

-----Original Message-----
From: John Ferrell [mailto:johnferrell at earthlink.net]
Sent: Tuesday, April 15, 2003 2:34 PM
To: discussion at nsrca.org
Subject: Re: Rudder Turbulator Strips

The blunt trailing edges recieved a lot of criticism on the Prophecy.

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