Rudder Turbulator Strips

[Richard Hallett]

Part of the equation that has not been considered is that some symmetrical surfaces with a thin trailing edge have a dead band that is avoided either by blunting, changing foil or putting a turbulator upstream.  Selig's 8020 was an attempt to resolved the issue in glider tails. Mark Drela suggested and uses a much more forward point on his foils I believe as part of this.  Dead band is the equivalent of having a loose steering box in your car where you have to move the steering wheel a measured distance before you are back at the other side again.  Are you old enough? Gets rid of all that hard work you put in getting it tight and precise. Now you have the opportunity to chase it around the sky with precision-  not the airplane but the neutral.  Nice can of worms.

Rick

Richard Hallett Pittsfield ME USA
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