----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Syd, Greg hit the correct main points. 1. It's most likely the airspeed indicator. a. Messing up the angle of the pitot/static probe is the most likely cause. I forget the details but there's guidance in one of the books for adjusting this and the angle is important. b. It's possible the pitot or static tube to the cockpit got messed up, perhaps the static tube from the probe didn't get reattached and now the plane is using the cabin for static. c. These old airspeed indicators sometimes go bad giving a much higher *indicated* airspeed than you are really doing. When I bought my Coupe, it was indicating high airspeeds by about the amount this plane is showing. I don't know when it went bad or how fast the change came. 2. The elevator up-travel could be checked. If they made the C to D conversion, they would see some increase in the rotation speed and minimum flying speed. The elevator travel can by check this way. This excerpt is from the pre-purchase inspection I wrote which can also be found on http://www.ercoupe.org. Check elevator up travel to specs using drilled hole in rudders. 415C, CD, D, E are different as is Forney, Alon, Mooney. On rudder, lay out line at right angles to leading edge of rudder from point midway between attaching bolts of center hinge, and running to rudder trailing edge. >From intersection of this line and rudder trailing edge, measure up or downward to find travel of elevator. See if it looks close for pre-purchase inspection, then get rigging re-done when you can. It'll take about eight hours or so for someone who know what he's doing to re-rig the plane, assuming you don't have to replace parts. Elevator: 415-C: up 13? down 12? (3.25" up ?.25", 2.88" down ?.5") 415-D: up 9? down 12? (2.2" up ?.25", 2.88" down ?.5") 415-E,G Forney F-, F-1A, Alon A-2, A2-A: up 20? down 10? (4.9" up, 2.5" down) M-10: up 25?-24? down 32?-36? Ed Burkhead http://edburkhead.com/ [EMAIL PROTECTED] -----Original Message----- From: Sydney Cohen [mailto:[EMAIL PROTECTED] Sent: Wednesday, July 02, 2003 11:01 PM To: Ercoupers Technical Subject: [COUPERS-TECH] High take-off speed ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Hello group, I recently was asked a question that I can't really answer. Maybe you can. A person I know says their Coupe always lifted off around 60 mph, but then had the O-200 crankshaft, etc. put in, some minor wing damage (nose ribs and leading edge skin) repaired, and some paint touch-up on the fuselage, and now it doesn't lift off until 75 - 80 mph. The person is now in Arizona at higher altitude (4000 ft instead of 1000 ft). I gave some suggestions, but what do you think? Syd ======================================================================== ====== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/ ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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