At 09:43 AM 11/17/01 -0600, you wrote:
Give us empirical data to show that RDS gives % reduction in drag, and this x-% reduction in drag correlates to a y-% increase in "performance"-- speed, sink rate, whatever.
I have "nothing against" the RDS system, and it seems to be a wonderful idea, but these discussions take on the flavor of religious dogma with little empirical data to demonstrate claims.
Did you get the link I sent you? While it doesn't address RDS specifically, it should give you the information you're looking for.
There's a paper written by Dr. Werner Würtz at http://beadec1.ea.bs.dlr.de/Airfoils/linkage.htm.
The title is "Drag of Aileron and Flap Linkages of a Sailplane Model."
HTH,
Joe Parsons
Let me see a before-and-after set of numbers to evaluate.
--Bill
From: "Harley Michaelis" <[EMAIL PROTECTED]>
To: "Bob Pope" <[EMAIL PROTECTED]>, "Bill Harris" <[EMAIL PROTECTED]>
CC: <[EMAIL PROTECTED]>
Subject: [RCSE] RDS drag reduction, speed increase.
Date: Fri, 16 Nov 2001 16:52:20 -0800
Just thinking, if 5% reduced drag could increase speed that much, a 16
second run would be reduced to 15.2 seconds. If drag is reduced 12% as Bob
says, it would be reduced to 14.08 seconds. Wouldn't it be worthwhile to
find out?
----- Original Message -----
From: "Bob Pope" <[EMAIL PROTECTED]>
To: "Bill Harris" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Friday, November 16, 2001 3:09 PM
Subject: Re: [RCSE] Re: RDS in tails, drag reduction.
> Bill Harris wrote:
>
> >
> >
> > The refenced site is unavailable now, but I seem to recall that the
> > drag of the four linkages works out to be some 5% of the total drag.
> > I have no idea if that is a significant value, but it seems minor
> > compared to the other sources of drag. Again, IMO.
> >
> > I'm from Missouri... :)
> >
> > --Bill
>
>
> Closer to 12% and yes it is noticeable.
>
> Bob
>
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