static RPM

Post-War Aeronca Champ airplanes
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boeing
Posts: 23
Joined: Tue Feb 20, 2007 22:12
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static RPM

Post by boeing »

Hi guys, what should the min/max full power static rpm be for my Champ.
I am running a C-85 with a McCauley 1B90-CM7146. However the prop has been repitched to a 43.
I realize that there are many variables here, ie density alt, engine condition, mixture, etc. what i am after is a min or max guideline.
My Cessna 140 that i had was running an STC with the 0-200 in it, and it had a min/max rpm published with the paperwork. I however do not have this with the Champ.
As it stands right now with the temperatures around the 70-80 degree mark I am getting around 2250 to 2300 rpm, How does that sound?
I was told that a good rule of thumb if everything is working OK is to use your max rpm(static) as a guidline for a cruise power setting.The cont manual has a 2250 rpm setting at about 67% power, seems about right.
Your thoughts!!!!!!
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Mikek
Posts: 594
Joined: Sat Nov 13, 2004 21:13
Location: Yellow Springs, Ohio 45387 [3OH0]
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Re: static RPM

Post by Mikek »

boeing wrote:Hi guys, what should the min/max full power static rpm be for my Champ.
I am running a C-85 with a McCauley 1B90-CM7146. However the prop has been repitched to a 43.
I realize that there are many variables here, ie density alt, engine condition, mixture, etc. what i am after is a min or max guideline.
My Cessna 140 that i had was running an STC with the 0-200 in it, and it had a min/max rpm published with the paperwork. I however do not have this with the Champ.
As it stands right now with the temperatures around the 70-80 degree mark I am getting around 2250 to 2300 rpm, How does that sound?
I was told that a good rule of thumb if everything is working OK is to use your max rpm(static) as a guidline for a cruise power setting.The cont manual has a 2250 rpm setting at about 67% power, seems about right.
Your thoughts!!!!!!
Looking at the TC wood prop c-85-8 2450 - 2190 ?
Mike Knemeyer

1410 Meadow Lane
Yellow Springs,Ohio 45387

3oh0
N83348 7AC-2015
N82146 7AC-772
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