Re: [COUPERS-TECH] C75 to C85

[roger anderson]

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Ed,

 

Thanks for all the good information.  Very helpful.   Roger

----- Original Message -----

From: Ed Burkhead

To: roger anderson ; Coupe-Tech

Sent: Tuesday, February 24, 2004 12:55 PM

Subject: RE: [COUPERS-TECH] C75 to C85

 

Roger,

 

With a C-85, here are the general Ercoupe prop groups

 

7152 – “cruise” prop (may not develop full cruise rpm and climb may stink with higher aircraft gross weights because you may not have enough power to turn the engine to rpm)

 

7150 – normal prop giving about 108 mph at 2400 rpm

 

7148 – normal climb prop giving improved climb and about 104 mph at 2400 rpm

 

7146 – my extreme climb prop (2250 static rpm – max allowed) better climb but only 100 mph at 2400 rpm

 

Check back in a hour and I’ll have more information posted that I just found.

 

Ed Burkhead

http://edburkhead.com/

[EMAIL PROTECTED]    (remove the QQQ)

 

-----Original Message-----
From: roger anderson [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 24, 2004 12:50 PM
To: Ed Burkhead; Coupe-Tech
Subject: Re: [COUPERS-TECH] C75 to C85

 

Thanks Ed.  Those are the numbers I had assumed to be correct.  However, in one of the logs someone had noted a lower number.  I think it must have related to the engine when it was a 75.  This engine has a high end cruise prop on it and 2300 seems to be about a comfortable cruise setting for it.  It won't turn up to 2575 with this prop.  Roger

----- Original Message -----

From: Ed Burkhead

To: roger anderson ; Coupe-Tech

Sent: Tuesday, February 24, 2004 12:29 PM

Subject: RE: [COUPERS-TECH] C75 to C85

 

----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
 
 

 

Roger,

 

When you convert your C-75 to a C-85, it IS a C-85.  You’ll follow all C-85 specs.

 

Teledyne Continental Motors C-75, C-85, C-90, O-200 Overhaul Manual page 12 says C-85

Normal Rated RPM . . . . . . . 2575

 

 

I remember seeing somewhere, somewhen, in some document, something that said maximum continuous cruise rpm should be 2400.  On the other hand, I had some experienced A&Ps tell me go ahead and run it, it’ll be happy.  I had a climb prop and could get to about 2575 in cruise though I rarely tried that.  I normally cruised at 2400 rpm.

 

Ed Burkhead

http://edburkhead.com/

[EMAIL PROTECTED]    (remove the QQQ)

 

-----Original Message-----
From: roger anderson [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 24, 2004 12:10 PM
To: tech@ercoupers.com
Subject: [COUPERS-TECH] C75 to C85

 

 
----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
 
 

What is the correct redline rpm and recommended cruising rpm for a C85 that was converted from a C75?

 

Thanks...Roger

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