That is known as a Gurney Flap, or wickerbill. It first appeared in Indy car racing on a Dan Gurney Car, thus the name. It is essentially a way to change the pressure differentials between two sides of an airfoil.. Do a google search on Gurney Flap and you'll find lots of information on it.
-Jeff Scott ----- Original Message ----- From: Dene Collett Sent: 12/24/11 03:53 AM To: 'KRnet' Subject: RE: KR> Thoughts and ideas on stretching the wingspan Mark, on the Whisper motor glider, the wing has a very pronounced cusp on the underside and results in very high stick forces due to the size and length of the ailerons. Pilot fatigue is a major factor on longer flights. We have corrected this with trim tabs but as you know this just adds drag. What a few builders have done to alleviate these high stick forces is to install "gourney" tabs on the trailing edges of the ailerons. This is nothing more that a lip of approx just under 3/8" that sticks up at 90deg at the trailing edge on the top surface of the aileron. It can be trimmed until the desired stick forces are attained. Aparently they do not add any significand drag. All I know is that they do work. I have flown in a whisper equipped with them. Regards Dene Collett Avlec Projects cc Port Elizabeth South Africa To earn 100% commisions follow the link below: http://www.empowernetwork.com/almostasecret.php?id=Dene1 _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
