Rudder Turbulator Strips

[Dean Pappas]

Hi John,
My experience with thick trailing edges is that it only helps the snaps, especially with the damping on the stops. The drag due to the thick TE is neglegible. An extra-wide rudder, on the other hand *would* get real draggy , but at speed, even the killer servos can't make make a wide rudder move as far as at low speed, and that is probably the cuprit you are wary of. Couterbalances will help that ... you've all seen the "great rudder experiment" at Ron Ellis' site http://www.mindspring.com/~rellis2/rcpattrn/rudder.htm
Regards,
	Dean  

-----Original Message-----
From: John Ferrell [mailto:johnferrell at earthlink.net]
Sent: Thursday, April 17, 2003 9:17 AM
To: discussion at nsrca.org
Subject: Re: Rudder Turbulator Strips


Thinking in public:
As the rudder TE becomes wider the dominate difference is likely drag.
Since drag is a function of velocity there would be little diference in
flight at low velocity.
However you might reach a point where a pattern ship would refuse to snap at
high velocity...
Just speculation.

----- Original Message -----
From: "Dean Pappas" <d.pappas at kodeos.com>
To: <discussion at nsrca.org>
Sent: Tuesday, April 15, 2003 4:49 PM
Subject: RE: Rudder Turbulator Strips


John, we are on the same page:
Blunt trailing edges make for torsionally stiffer (read that lighter)
ailerons and the like. They also soften the neutrals (and the textbooks say
so).
They also reduce the ultimate CL of an airfoil, unless it is designed to
work with one.
Selig worked up one such for the SAE weight-lifting students who wanted to
stick with non-composite wings. It gives up "almost nothing" to the razor
sharp TEs.
Somehow the hundredth of a mile per hour that is robbed matters to some
people.
Let's face it, the sharp TEs look sexy, and that probably where the rubber
meets the road.

as confused as you are,
Dean



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