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] > >
<<attachment: winmail.dat>>
