---------------------------------------------------------- Glasair-List Digest Archive --- Total Messages Posted Tue 02/09/10: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:05 AM - Blended foil prop (Craymondw@aol.com) ________________________________ Message 1 _____________________________________ Time: 11:05:40 AM PST US From: Craymondw@aol.com Subject: Glasair-List: Blended foil prop I had a brief window in our terrible weather yesterday to see what my performance would be using my new Hartzell "blended foil" prop on my 200 hp Gl2S FT. I noted the performance at altitudes of 2,000 and 3,000 feet with the power set at 24.5 inches, 2375 RPM, 50 degrees rich of peak, with an outside temperature of 50 degrees. My indicated airspeed using my old Hartzell averaged around 163 mph at those settings at those altitudes. Using my new blended foil design, I noted indicated airspeed of 185 mph. In the past my best performance using my previous prop was in the 8,000 to 9,000 feet altitude range that averaged a 205 mph ground speed. So when this Global Warming freezing air moves out giving me an opportunity to travel I will report any differences in cruise speed at those altitudes. With a previous experimental I owned I noticed that in cruise settings I had down elevator trim that I felt was causing drag. So when I constructed our Glasair I changed the angle of attack on my horizontal stabilizer to around 1/8 positive. I felt having any elevator up trim would be less drag. And in cruise I did note that my GL2S did require a little up trim because I could see that the counter balances surfaces would protrude below the horizontal stab by about 3/8's of an inches. But I noted with the added thrust using my knew blended foil and higher speed that the elevator required m ore down trim causing the tail feathers to become stream lined...yeah!!. My GL2S driver wife was sitting in the co pilot seat and was very excited about the increased performance. I did note it takes more to slow the plane down in the landing pattern using this new prop. Setting my old Hartzell into high RPM would act like a speed brake, but with this new blended foil in high RPM our plane now wants to keep on trucking. Another feature is how much more quiet the prop is. I even removed my head set and noted the cabin way quieter. I had around 600 hours on my old prop and found prop shops willing to pay between $2500 and $3000 as is. Instead I decided to have a reasonably priced tear down inspection, cleaning and repaint and placed the prop for sale in Trader Plane for $5,500 and started receiving inquiries and sold it for the full price in a two issue ad. One woman asked if I would consider selling just the blades!! $6,000 for a set of good blades would have been better for me but I turned down the offer. Harry Delong at the Glasair Company is the blended foil expert and went to bat for me when YRC freight company screwed up the shipping costs that have yet to be resolved. To avoid this I suggest having any props shipped to a business address. Charles Raymond ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message glasair-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Glasair-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/glasair-list Browse Digests http://www.matronics.com/digest/glasair-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.