---------------------------------------------------------- Glasair-List Digest Archive --- Total Messages Posted Sat 06/09/12: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:08 AM - Re: Palmer's Glasair (Craymondw@aol.com) 2. 09:09 PM - Indicated stall speed question (mppalmer@aol.com) 3. 09:59 PM - Re: Indicated stall speed question (Craymondw@aol.com) ________________________________ Message 1 _____________________________________ Time: 09:08:20 AM PST US From: Craymondw@aol.com Subject: Glasair-List: Re: Palmer's Glasair Does any one know what model Glasair Palmer has for sale, what engine it has and the asking price? In a message dated 6/9/2012 3:06:12 A.M. Eastern Daylight Time, glasair-list@matronics.com writes: * ================================================= Online Versions of Today's List Digest Archive ================================================= Today's complete Glasair-List Digest can also be found in either of the two Web Links listed below. The .html file includes the Digest formatted in HTML for viewing with a web browser and features Hyperlinked Indexes and Message Navigation. The .txt file includes the plain ASCII version of the Glasair-List Digest and can be viewed with a generic text editor such as Notepad or with a web browser. HTML Version: http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 12-06-08&Archive=Glasair Text Version: http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 2012-06-08&Archive=Glasair =============================================== EMail Version of Today's List Digest Archive =============================================== ---------------------------------------------------------- Glasair-List Digest Archive --- Total Messages Posted Fri 06/08/12: 0 ---------------------------------------------------------- Today's Message Index: ---------------------- ________________________________ Message 2 _____________________________________ Time: 09:09:14 PM PST US Subject: Glasair-List: Indicated stall speed question From: mppalmer@aol.com I was wondering what you GI FT and GII FT pilots (but not stretch or SS) see for an indicated stall speed? Our airspeed will drift down to about 65 KIAS and stay there throughout the stall. (Power off, flaps up, for example.) I know that can't be correct because it takes a while for the stall to occur and I can hear the wind noise decreasing during that time. The airspeed should continually be decreasing, but that's not the indication I get. Apparently we have some kind of installation problem. We have a combination pitot/static tube, as used on the old Viking aircraft, that's mounted behind the main spar shear web. (I'm told this is a $1000 part now. Sure doesn't work like it.) The static port never did work right on the Glasair - you would take off and watch the altimeter go below the runway as the static air wasn't! More critically, I was never at Glide Slope crossing altitude on ILS approaches. And that bothered me when it was for real. So I moved the static ports to the aft fuselage, per a newsletter article by John Levy. That pretty much solved the false altimeter problem. But now I'm wondering if I'm getting a low pressure area behind the rear windows in the stall configuration that causes the airspeed in stall to read artificially high? Last week I extended the pitot tube away from the wing a few inches so that the tip is now 6 inches below the wing. I've only done one stall in Phx thermal conditions. It didn't seem to make much difference in the stall speed behavior. I'm thinking of temporarily hooking the static side of the system to the old hose that's hanging open inside the wing as an experiment. Surely inside the wing ought to be a big lazy pool of static air? In the meantime, I thought I'd ask the group if you're seeing any bizarre stall speed behavior? Or had to do anything to solve this problem? I beta tested a Rite Angle AOA for Elbie Mendenhall years ago, and installed it also about 6 inches below the wing on a streamlined tube coming out of an inspection cover. We also got bizarre results. The AOA would begin to increase a little as I would slow down but then hold the same into the stall. We figured there was too much bow wave and we had to move the probe about 10 inches away from the wing. But I never tried that so we don't know. Mike Palmer <>< ________________________________ Message 3 _____________________________________ Time: 09:59:33 PM PST US From: Craymondw@aol.com Subject: Re: Glasair-List: Indicated stall speed question I built a Glasair2S FT and Cliff advised me to place my static ports near the middle of the fuselage and half way between the end of the rear window and the leading edge of the stabilizer. That was twenty years ago and now you have me wondering and will take measurements to be sure. My static ports consist of a plate on the out side that is connected to the fuse by three small bolts. I purchased them from AC Spruce. I added a three inch extension to my pitot and it is about five inches below the wing. I attached my pitot to the outer inspection plate. I am a little on the thick side and have never been able to understand what a knot is and have everything calibrated in MPH. With that in mind, my indicated flaps down stall speed is 63 mph and around 66 flaps up. I do show a discrepancy between my indicated air speed and GPS ground speed at cruise with my GPS showing a 10 mph faster speed than my indicated. I should add that my empty weight with seven quarts of oil is around 1,375 pounds and I weight 147 pounds. During my test flights I tried coming over the fence at 75 mph and found that I didn't have enough speed to flare with and the plane fell out of the air and I made a hard landing. So I increased the speed to 85 mph and that smoothed it out. Chuck Raymond N16CD In a message dated 6/10/2012 12:09:38 A.M. Eastern Daylight Time, mppalmer@aol.com writes: --> Glasair-List message posted by: mppalmer@aol.com I was wondering what you GI FT and GII FT pilots (but not stretch or SS) see for an indicated stall speed? Our airspeed will drift down to about 65 KIAS and stay there throughout the stall. (Power off, flaps up, for example.) I know that can't be correct because it takes a while for the stall to occur and I can hear the wind noise decreasing during that time. The airspeed should continually be decreasing, but that's not the indication I get. Apparently we have some kind of installation problem. We have a combination pitot/static tube, as used on the old Viking aircraft, that's mounted behind the main spar shear web. (I'm told this is a $1000 part now. Sure doesn't work like it.) The static port never did work right on the Glasair - you would take off and watch the altimeter go below the runway as the static air wasn't! More critically, I was never at Glide Slope crossing altitude on ILS approaches. And that bothered me when it was for real. So I moved the static ports to the aft fuselage, per a newsletter article by John Levy. That pretty much solved the false altimeter problem. But now I'm wondering if I'm getting a low pressure area behind the rear windows in the stall configuration that causes the airspeed in stall to read artificially high? Last week I extended the pitot tube away from the wing a few inches so that the tip is now 6 inches below the wing. I've only done one stall in Phx thermal conditions. It didn't seem to make much difference in the stall speed behavior. I'm thinking of temporarily hooking the static side of the system to the old hose that's hanging open inside the wing as an experiment. Surely inside the wing ought to be a big lazy pool of static air? In the meantime, I thought I'd ask the group if you're seeing any bizarre stall speed behavior? Or had to do anything to solve this problem? I beta tested a Rite Angle AOA for Elbie Mendenhall years ago, and installed it also about 6 inches below the wing on a streamlined tube coming out of an inspection cover. We also got bizarre results. The AOA would begin to increase a little as I would slow down but then hold the same into the stall. We figured there was too much bow wave and we had to move the probe about 10 inches away from the wing. But I never tried that so we don't know. Mike Palmer <>< ------------------------------------------------------------------------------------- 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.