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Ed Burkhead http://edburkhead.com <http://edburkhead.com> ed -at- edburkheadQQQ.com (change -at- and remove QQQ) -----Original Message----- From: William R. Bayne [mailto:[EMAIL PROTECTED] Sent: Sunday, March 13, 2005 9:22 PM To: Ed Burkhead Subject: WRB Re: [COUPERS-TECH] Cruise prop vs. climb prop RLYTECH (WRB via Ed Burkhead's computer-I can't post directly) Please send responses directly to the list or to me, Bill Bayne @ <[EMAIL PROTECTED]> Hi Larry (WRB speaking), Your prop is the standard McCauley for the C-75-12 on a 415-C. Appendix A of Ercoupe Service Memorandum says with this prop at 1260 gross and under "standard day"conditions you should cruise at 2275 rpm and 109 mph, abd be flat out at 2500 RPM and 122 MPH. The bird should be off with zero wind from turf in 520' and climb 720 FPM (if it were new). Be sure your static rpm is between 1950 and 2100, per ATC-718 (the higher, the better). Is engine compression up to par? On Mar 13, 2005, at 6:07 PM, Larry Snyder wrote: > I don't know what I should expect for climb performance from my 415C > with a C75. It's anemic, and reading the archives leads me to believe > this is not a surprise. So my main question is, is a McCauley 1B90 > CM7351 a climb prop or a cruise prop? I know that the prop range for > the C75 was 71 to 73, but I'm not sure if a 51" pitch is considered > climb or cruise on a 73" prop. I would be willing to sacrifice a bit > of cruise speed for a bit better climb - the terrain at the south end > of our runway goes up - and so while I'm climbing out I have the > visual illusion of not climbing! Add to that the fact that there is a > McDonald's not too far south on the top of the hill, and it can be a > bit disconcerting. I guess I want to make sure that on some hot day I > don't visit the drive-thru! > > Thanks! > > Larry > N99340 ========================================================================== ==== 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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