Today's Message Index:
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1. 07:49 AM - Question re hp percent (ThomasTholmes512@aol.com)
2. 10:30 AM - Re: Question re hp percent (flyv35b)
3. 07:48 PM - Re: Question re hp percent (ThomasTholmes512@aol.com)
4. 10:21 PM - Re: Question re hp percent (Steven Jackson)
Message 1
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| Subject: | Question re hp percent |
--> TeamGrumman-List message posted by: ThomasTholmes512@aol.com
Folks,
Is figuring the percentage of hp for a 150 hp AA1 as easy as looking it up in
a P or C POH? Or Cheetah for that matter.
Tom
PS,
I don't have any documentation w/me at the moment and I'm curious as to what
rpm constitutes 75% hp.
Message 2
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| Subject: | Re: Question re hp percent |
--> TeamGrumman-List message posted by: "flyv35b" <flyv35b@juno.com>
> Folks,
> Is figuring the percentage of hp for a 150 hp AA1 as easy as looking it up
in
> a P or C POH? Or Cheetah for that matter.
> Tom
> PS,
> I don't have any documentation w/me at the moment and I'm curious as to
what
> rpm constitutes 75% hp.
No, it's not that easy. If your prop is pitched such that you can turn 2700
rpm at full throttle in level flight you probably can get a pretty
reasonable approximation with the Cheetah performance info for the 59 in.
pitch cruise prop. Since prop pitches vary considerably on the O-320 engine
converted 2 place planes so does the % power even at the same rpm.
The only really accurate way to determine % power would be to install a
manifold pressure gauge and use that info along with rpm and OAT and
Lycomings graphs in their operator's manual to accurately determine % power.
With this info it doesn't make any difference what prop pitch you have you
can determine % power even during climbs and descents. It is a useful
instrument even though many people will say it is not needed with a fixed
pitch prop.
Cliff
----- Original Message -----
From: <ThomasTholmes512@aol.com>
Subject: TeamGrumman-List: Question re hp percent
> --> TeamGrumman-List message posted by: ThomasTholmes512@aol.com
>
> Folks,
> Is figuring the percentage of hp for a 150 hp AA1 as easy as looking it up
in
> a P or C POH? Or Cheetah for that matter.
> Tom
> PS,
> I don't have any documentation w/me at the moment and I'm curious as to
what
> rpm constitutes 75% hp.
>
>
Message 3
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| Subject: | Re: Question re hp percent |
--> TeamGrumman-List message posted by: ThomasTholmes512@aol.com
I was afraid it would be a complicated issue. ;-)
Tom
Message 4
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| Subject: | Question re hp percent |
--> TeamGrumman-List message posted by: "Steven Jackson" <steven.jackson14@adelphia.net>
Get a copy of a Lycoming Operator's manual. I can't remember if you have a
Tiger or one of the O-320 powered planes. But, inside the operators manual,
besides all the other good gouge on the engine that's in there, there is
also a performance chart that displays %horsepower for different
configurations of fuel consumption, manifold pressure, and rpm. For my
plane, 75% power is achieved at approximately 8000' density altitude, and
tapers off as it gets higher
Steven Jackson
N1434R
L22
Yucca Valley, CA
-----Original Message-----
From: owner-teamgrumman-list-server@matronics.com
[mailto:owner-teamgrumman-list-server@matronics.com]On Behalf Of
ThomasTholmes512@aol.com
Subject: Re: TeamGrumman-List: Question re hp percent
--> TeamGrumman-List message posted by: ThomasTholmes512@aol.com
I was afraid it would be a complicated issue. ;-)
Tom
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