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TOPIC: Conversion of C75-12F to C85

Conversion of C75-12F to C85 11 Jun 2017 08:47 #997

  • Larry Snyder
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I have a C-85 with the O-200 crank and a 7149 prop. I cruise at 2400 with the throttle back a little. At full throttle I get a little over 2500 rpm. So it sounds that a 7150 might have a little lower top RPM. My static is about 2225. With a light airplane (me and not full fuel) I climb at 1200 fpm on a cool day. Worst case is 300-400 fpm loaded on a hot day. I cruise at 105-110 depending on how heavy we are. If you are flying heavy, you will get nowhere near redline. At least that's my experience.
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Conversion of C75-12F to C85 30 May 2017 14:23 #973

  • Arlan Allen
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Have you had the tach checked? I found an error or 75 RPM in my tach. It was reading low ie. 2575 equalled 2500 indicated.

Arlan
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Alan Allen
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Conversion of C75-12F to C85 30 May 2017 14:14 #972

Bill, you might post your issue on the Yahoo group. This email address is being protected from spambots. You need JavaScript enabled to view it.

It's a very active forum.
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Conversion of C75-12F to C85 30 May 2017 13:59 #971

Ken Thompson

Ken

My concern is not so much related to airspeed . My concern is that the engine is rated at 2575 Max RPM and I can't approach that performance. Never had a plane that required throttle firewalled to get 70% power.

Bill
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Conversion of C75-12F to C85 30 May 2017 12:58 #970

William, you have a cruise prop. Don't expect it to give you amazing climb out, but you'll pick up a few more mph on cruise than a climb prop would give you. Just may take you a little extra time to get to cruise altitude. If you don't have any obstacles to worry about taking off from your home airport, you'll be fine.

Mine has the 7150 but I have a C85 'stroked' with an 0-200 crank and it climbs very nicely with 400 pounds of people and full fuel.
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Conversion of C75-12F to C85 28 May 2017 09:58 #967

Larry, what do you mean "get the prop cut and re pitched ? mine is 7150 . . . .

Bill James
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