---------------------------------------------------------- Commander-List Digest Archive --- Total Messages Posted Thu 06/21/07: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:04 PM - Re: winglets (BillLeff1@aol.com) ________________________________ Message 1 _____________________________________ Time: 11:04:10 PM PST US From: BillLeff1@aol.com Subject: Re: Commander-List: winglets Just to set the record straight. The AeroDyne winglets were not developed by the Air Force engineers. However, the deign was evaluated by Air Force engineers, visually not in wind tunnels, and they felt that they could probably not be improved on in their present form. They felt that there would not be a reasonable return on investment if additional evaluation was done. The originals were Commander factory winglets for the 695 Jet Props. A set of those were installed on Av Fuel's 500S (N66AV). Basically those that followed were copies of the factory winglets. They were then modified (stretched) to fit the 690 wing. No flight test were conducted to certify any performance improvement because it was too expensive. I conducted some of the original flight test for Dick Wartinger. Most of the flight test for certification were to make sure that there were no adverse effects like vibration. My findings about performance were subjective but I found that they made a significant improvement in the following areas: Low Speed , high angle of attack operations. The aircraft lifts off easier Stalls are much cleaner and normally break straight ahead (stall speed my be lower but we never certified that. Aileron control at low speed is significantly improved so cross winds are easier to handle especially in short wing aircraft (520 560 680s and Turbos). Approach speeds can be lowered 5-10 kts because of better low speed characteristics. Single engine climb appears to be improved It is hard to ell about normal climb I have never noticed any increase in cruse speed. And Oh Yea... they look way cool!!!!!! I did buy one of the first sets to put on a 681. My employer also had a 695A (1000) as well and it came with factory winglets. Anyway, that is the story on the winglets. Bill Leff ************************************** See what's free at http://www.aol.com. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message commander-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Commander-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/commander-list Browse Digests http://www.matronics.com/digest/commander-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.