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In a message dated 2/19/03 8:38:20 PM Eastern Standard Time, [EMAIL PROTECTED] writes: > > "No R.P.M. restrictions are required on any Met-L-Props except for those > models specified in notes 7, 8, 9, 15, 18, 19, and 20." > This applies to RPM restrictions that originally were imposed on some installations. I'm sure there are some coupes around with a placard on the panel that something like "Avoid continuous operation between 1950 and 2150 RPM". These restrictions have since been lifted (In McCauley SB-13, back around 1949). Regardless, the prop TCDS sets limits on which model props are permitted to be installed on which engines and what the dimension limits are for such installations. Further more, the aircraft TCDS further restricts the choices and dimensions and takes precedence over the prop TC. The prop TCDS states that the installation on the 85 horse engine is limited to 2575 RPM. They do not specify that they refer to a continental C85, so I suppose there may be another 85 horse engine out there, and it may be certified for more than 2575 RPM. McCauley is simply stating that that installation would be limited to 2575 RPM. In reality, however, they are saying that the airframe manufacturer should not include that engine/prop combination. What concerns me is that McCauley has specifically said that when installing the prop on an O200, which operates above 2575, for the purpose of maintaining an adequate vibration profile, the MINIMUM diameter is 71". The coupe TCDS stateds that on the C85 installation, the MAXIMUM diameter is 71" So, if you have your prop reworked while the O200 crank STC is being installed in your C85, and put the two together and decide to fly at greater than 2575 RPM, you are operating in a range that McCauley specifically prohibits, as does Continental and ERCO. You are offically a test pilot and all bets are off. Why bother anyhow? If you want to go fast, buy a [real] Mooney. Over and out, as the uninformed say, John ========================================================================== ==== 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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