Dave.
two things come to my mind. 1. Your pitot pickup is bent upwards, should be pointing parallel to the wing under surfaces. 2. More likely Your ASI is old and incorrect. I had an old Kollsman for overhaul ones and the repair station reported that the scale on the asi did not fit the instrument. Years ago someone had taken the dial? out and flipped the sheet with numbers around, printed new numbers on it and that way converted a knot indicating instrument to a MPH instrument. Of course all numbers where bogus on that instrument. 3. Check your tubing . Your Your static line might be open. The static port is at the pickup tube under the wing. If the line is open toward the cockpit false readings might occur. Hartmut To: [email protected] From: [email protected] Date: Thu, 13 Aug 2009 03:22:41 +0000 Subject: [ercoupe-tech] Indicated Stall Speed I was flying with a friend who is a private pilot today in the 'coupe. We were well under 1400#, since I had already flown for a .7 and didn't top off tanks when I picked him up. We went to 2500' and he set up for slow flight at 65 MPH in smooth air. We were just under 70 MPH, and we went from the full back elevator "mush" with around 200 FPM sink rate into a stall where the right wind dropped. The airplane flew itself out just fine, but we were both surprised because we didn't expect the stall to occur until below 60 MPH. I took the airplane, and the exact same thing happened when I tried it. I called the previous owner, and he explained that when the wing is at a high AOA, the pitot tube is not getting a clean airspeed reading and it is probably reading higher than actual airspeed. He said he's had the airpeed checked by another airplane flying formation off his in normal flight, and it agreed within a couple MPH. Just wondering if anyone else has experienced this. Next flight I plan to log the actual observed stall speeds and pencil them into my operations manual. Thanks, Dave _________________________________________________________________ Express your personality in color! Preview and select themes for Hotmail®. http://www.windowslive-hotmail.com/LearnMore/personalize.aspx?ocid=PID23391::T:WLMTAGL:ON:WL:en-US:WM_HYGN_express:082009
