Jim, I checked it earlier and it was still the C75 nameplate, but the engine runs like a scawled banshee. In cruise flight, I can easily run it out to 2550rpm at 5000 ft. msl. I keep it within the redline for a C75 though. It will pull 2150rpm on the ground for a full power runup. I believe the book says (I'm working from memory here) that the 75hp should runup at 2100rpm. Anyway, it sure is a strong running little engine. Dennis Schmaltz Mission, SD 94715
Jim McLean wrote: > > When converted from 75 hp to 85 hp a new engine tag is supposed to be placed > on the engine. Have you checked this tag on the top right of the engine > case? > Jim > -----Original Message----- > From: Dennis Schmaltz <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] <[EMAIL PROTECTED]> > Cc: [EMAIL PROTECTED] <[EMAIL PROTECTED]> > Date: Wednesday, March 03, 1999 10:11 AM > Subject: Re: Correct Prop > > >Here's one for you. I have (supposedly) a C75-12. The prop on it, > >according to the tag from the prop shop that was in the paperworks says > >that the prop is a 1C90-LM7252. What engine is this prop supposed to be > >on and what engine do I have? I say this becaused I cann't find > >anything to indicate that my C75 was converted to a C85, but the dip > >stick has been remarked to indicate 4.5 quarts and the plane has a tach > >in it with markings for the 85 horse engine. Makes me wonder. > >Dennis Schmaltz > >Mission, SD > >94715 > > > > > >[EMAIL PROTECTED] wrote: > >> > >> Charlie, If I remember correctly, for the 75 it should be a 73" dia. > >> with 71" perhaps being the minimum for repair. The pitch is finer than > >> that of the 85 prop, so it should be 7351 (I think) for the 75. If you > >> install a 85 HP prop on the 75, you "may" get the same performance as the > >> 85. 85 props are 7150 std, and 7148 climb, with 69.5" being the min. for > >> repair. The shorter prop allows for the acheivement of the higher rpm > >> of the 85. The 75 hp McCauley specs are in the Service Bulletins and > >> Memos. The spec for the 85 hp McCauley prop are in the Univair catalog. > >> > >> Speeds. We used to fly 3 Ercoupes in loose formation with a Cessna 140 > >> with 85 hp. The other two Ercoupes airspeed indicators read higher than > >> mine. They said, "they cruised at 110." My coupe, indicated 100 (110 > >> WIDE OPEN LEVEL !) was faster than theirs regardless of the indicated > >> airspeed. And, alas, the Cessna with the same prop and engine could > >> steadily pull away from me when I was wide open. My prop is a 7150 which > >> now measures at minimum diameter of 69.5". I have had people tell me > >> their coupe cruises 110 and even 120 but it ain't so. In the real world, > >> and if their airspeed indicators were right, more like 100, 105, 109, > >> depending on model, engine, etc. > >> > >> Engine condition. Prop. Rigging. Drag (mucho antennas, etc.) Getting > >> on the step. All of the above, and more, impact top speed and cruise > >> speed at a given rpm. Oh, and the top of the canopy is a real source of > >> drag. Do you fly with yours cracked? I have put a shade panel in mine > >> and the two side windows which used to meet at the top not just come up > >> to the edges of the shade window which is Smooth on top. Really, a 75 > >> ought to go just as fast as an 85 hp model, assuming both have engines > >> that are not "tired." > >> > >> Grover > >> 99398 > >> Columbus, GA > >> On Thu, 25 Feb 1999 10:00:39 -0500 "Charlie Nightingale" > >> <[EMAIL PROTECTED]> writes: > >> >Need to know if anyone has the following: > >> > 1. What is the correct Mccaully prop for a 75hp Ercoupe under > >> >cruise > >> >conditions.The numbers on mine have been overmarked and > >> >are not readily readable. It looks like CM 71.??. My speed is only > >> >about 98 > >> >mph by GPS AT 2450. I believe it is a CLIMB prop?? > >> >Charlie N555CN Farmville,VA. > >> > > >> > > >> > >> ___________________________________________________________________ > >> You don't need to buy Internet access to use free Internet e-mail. > >> Get completely free e-mail from Juno at http://www.juno.com/getjuno.html > >> or call Juno at (800) 654-JUNO [654-5866] > > > >
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