Today's Message Index:
----------------------
1. 05:54 AM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b)
2. 06:02 AM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b)
3. 06:10 AM - Re: TteamGrumman-List: Percent power. How to calculate? . . . Survey says! (923te)
4. 07:17 AM - Re: Percent power. How to calculate? . . . Survey says! (cloudvalley@comcast.net)
5. 08:40 AM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b)
6. 09:52 AM - Re: Percent power. How to calculate? . . . Survey says! (teamgrumman@aol.com)
7. 09:57 AM - Re: Re: TteamGrumman-List: Percent power. How to calculate? . . . Survey says! (teamgrumman@aol.com)
8. 11:22 AM - Re: Percent power. How to calculate? . . . Survey says! (cloudvalley@comcast.net)
9. 12:04 PM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b)
10. 12:33 PM - why would I ask him? (GOLDPILOT@aol.com)
11. 06:36 PM - Re: why would I ask him? (cloudvalley@comcast.net)
12. 11:10 PM - Re: Percent power. How to calculate? . . . Survey says! (teamgrumman@aol.com)
Message 1
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
> In hind site, I wish I had installed a manifold pressure gauge. Both the
> DER and I believed the POH is what pilots would be using to fly at 75%
> power. We had no idea that 75% power meant different things in different
> references. We had no idea the FAA approved flight manual for the AG5B
> would be a gallon an hour more under the same conditions.
When I installed the O-320 engine in my AA-1C I installed a MP gauge because
I knew there was no data for this engine combination and knowing MP was
almost mandatory to be able to have any reasonable idea of what the power
setting was. This has turned out to be a very good way to determine and
adjust power setting. I can take the power chart from my Bonanza which
shows % power for various RPM and MP settings and temperatures and use it to
determine power with the Grumman. It won't be far off. I would also
install a MP gauge in a Tiger if I owned one even though the factory has
provided info as I believe that MP is important even for a fixed pitch prop
installation. For example: what is your power setting in a dive or even a
500 fpm descent at 2700 rpm? If you don't know the MP you have no idea what
it is! You might be operating at 15" hg. In your case, Gary, with your
engine and prop I would think you would absolutely want a MP gauge.
Cliff
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Message 2
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
> Between Concorde and Auburn at 5500 feet I found 2 C degree air (38.6 F).
> Altimeter setting was 30.50 inches.
> I went full throttle and got 23.8 inches of manifold pressure.
> (Now, as we all should know by now, the inlet on the AG5B eats
> about an inch of pressure so I would suspect the actual manifold
> pressure should have been 24.5 inches or so.)
I don't think you would achieve 24.5" with your plane. Even the very best
induction systems loose about 1" MP through the air filter and induction
plumbing (at sea level and full throttle). At 5500 ft you would be down to
25" minus the induction system loss of 1" say or maybe 1.5" on the AG-5B.
So 23.8" is reasonable (for the AG-5B induction system). A MP gauge will
tell you a lot about this as you see what the actual MP is on takeoff when
you apply full throttle. You can also take out the air filter and possible
see what effect it has.
Cliff
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Message 3
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| Subject: | Re: TteamGrumman-List: Percent power. How to calculate? |
. . . Survey says!
You might want to use the more accurate and more current chart and
recalculate your numbers. I sent it to you direct 'cause I didn't thiunk
it would come thru here. I'll try and attach it now as I see that teh
Fig 3-34 did come thru. This is Fig 3-35. Hoe it helps
ned
Message 4
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
Hi Cliff,
=C2-I thought you didn't worry about manifold pressure; just get to about
2500RPM or so and then pull out the mixture til rough and back in slightly
..smile
Brian
----- Original Message -----
From: "flyv35b" <flyv35b@minetfiber.com>
Sent: Wednesday, April 29, 2009 6:02:16 AM GMT -08:00 US/Canada Pacific
Subject: Re: TeamGrumman-List: Percent power. =C2-How to calculate? . . .
=C2-Survey says!
> Between Concorde and Auburn at 5500 feet I found 2 C degree air (38.6 F).
> Altimeter setting was 30.50 inches.
> I went full throttle and got 23.8 inches of manifold pressure.
> =C2- =C2- =C2- (Now, as we all should know by now, the inlet on the
AG5B eats
> =C2- =C2- =C2- about an inch of pressure so I would suspect the act
ual manifold
> =C2- =C2- =C2- pressure should have been 24.5 inches or so.)
I don't think you would achieve 24.5" with your plane. =C2-Even the very
best
induction systems loose about 1" MP through the air filter and induction
plumbing (at sea level and full throttle). =C2-At 5500 ft you would be do
wn to
25" minus the induction system loss of 1" say or maybe 1.5" on the AG-5B.
So 23.8" is reasonable (for the AG-5B induction system). =C2-A MP gauge w
ill
tell you a lot about this as you see what the actual MP is on takeoff when
you apply full throttle. =C2-You can also take out the air filter and pos
sible
see what effect it has.
Cliff
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=C2- =C2- =C2- =C2- =C2--Matt Dralle, List Admin.
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Message 5
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
I don't WORRY about it. But I use it for setting the power level. And
yes, I do lean to rough and then back in slightly until it smooths out.
RPM will depend on what altitude you are at and how much power you want.
Up high I would run pretty much at 2700 rpm.
Cliff
----- Original Message -----
From: cloudvalley@comcast.net
To: teamgrumman-list@matronics.com
Sent: Wednesday, April 29, 2009 7:14 AM
Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . .
Survey says!
Hi Cliff,
I thought you didn't worry about manifold pressure; just get to about
2500RPM or so and then pull out the mixture til rough and back in
slightly..smile
Brian
----- Original Message -----
From: "flyv35b" <flyv35b@minetfiber.com>
To: teamgrumman-list@matronics.com
Sent: Wednesday, April 29, 2009 6:02:16 AM GMT -08:00 US/Canada
Pacific
Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . .
Survey says!
<flyv35b@minetfiber.com>
> Between Concorde and Auburn at 5500 feet I found 2 C degree air
(38.6 F).
> Altimeter setting was 30.50 inches.
> I went full throttle and got 23.8 inches of manifold pressure.
> (Now, as we all should know by now, the inlet on the AG5B eats
> about an inch of pressure so I would suspect the actual
manifold
> pressure should have been 24.5 inches or so.)
I don't think you would achieve 24.5" with your plane. Even the very
best
induction systems loose about 1" MP through the air filter and
induction
plumbing (at sea level and full throttle). At 5500 ft you would be
down to
25" minus the induction system loss of 1" say or maybe 1.5" on the
AG-5B.
So 23.8" is reasonable (for the AG-5B induction system). A MP gauge
will
tell you a lot about this as you see what the actual MP is on takeoff
when
you apply full throttle. You can also take out the air filter and
possible
see what effect it has.
Cliff
--
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Message 6
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
Hi Cliff,
My plane does have manifold pressure. As does the Tiger I flew with
the 800. It's just that the Tiger used for the flight tests didn't.
We didn't think it was necessary since the plane didn't come with it.
We thought the POH was enough. Which it should be.
Message 7
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| Subject: | Re: TteamGrumman-List: Percent power. How to calculate? |
. . . Survey says!
I got it Ned, But, it doesn't show fuel burn. The entire bottom half
of the chart is missing on your chart.
-----Original Message-----
From: 923te <923te@att.net>
Sent: Wed, 29 Apr 2009 6:09 am
Subject: TeamGrumman-List: Re: TteamGrumman-List: Percent power. How
to calculate? . . . Survey says!
You might want to use the more accurate and
more current chart and recalculate your numbers. I sent it to you
direct 'cause
I didn't thiunk it would come thru here. I'll try and attach it now as
I see
that teh Fig 3-34 did come thru. This is Fig 3-35. Hoe it helps
ned
Message 8
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
Hi again Cliff,
I was just kidding, but I do understand, higher RPM up high. Hope to see yo
u sometime at lunch over there.
Brian
----- Original Message -----
From: "flyv35b" <flyv35b@minetfiber.com>
Sent: Wednesday, April 29, 2009 8:40:01 AM GMT -08:00 US/Canada Pacific
Subject: Re: TeamGrumman-List: Percent power. =C2-How to calculate? . . .
=C2- Survey says!
=EF=BB
I don't WORRY about it.=C2- But I use it for setting the power level.=C2
- And yes, I do lean to rough and then back in slightly until it smooths
out.=C2- RPM will depend on what altitude you are at and how much power y
ou want.=C2- Up high I would run pretty much at 2700 rpm.
Cliff
----- Original Message -----
From: cloudvalley@comcast.net
Sent: Wednesday, April 29, 2009 7:14 AM
Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Surve
y says!
Hi Cliff,
=C2-I thought you didn't worry about manifold pressure; just get to about
2500RPM or so and then pull out the mixture til rough and back in slightly
..smile
Brian
----- Original Message -----
From: "flyv35b" < flyv35b@minetfiber.com >
Sent: Wednesday, April 29, 2009 6:02:16 AM GMT -08:00 US/Canada Pacific
Subject: Re: TeamGrumman-List: Percent power. =C2-How to calculate? . . .
=C2-Survey says!
> Between Concorde and Auburn at 5500 feet I found 2 C degree air (38.6 F).
> Altimeter setting was 30.50 inches.
> I went full throttle and got 23.8 inches of manifold pressure.
> =C2- =C2- =C2- (Now, as we all should know by now, the inlet on the
AG5B eats
> =C2- =C2- =C2- about an inch of pressure so I would suspect the act
ual manifold
> =C2- =C2- =C2- pressure should have been 24.5 inches or so.)
I don't think you would achieve 24.5" with your plane. =C2-Even the very
best
induction systems loose about 1" MP through the air filter and induction
plumbing (at sea level and full throttle). =C2-At 5500 ft you would be do
wn to
25" minus the induction system loss of 1" say or maybe 1.5" on the AG-5B.
So 23.8" is reasonable (for the AG-5B induction system). =C2-A MP gauge w
ill
tell you a lot about this as you see what the actual MP is on takeoff when
you apply full throttle. =C2-You can also take out the air filter and pos
sible
see what effect it has.
Cliff
--
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The Professional version d =C2- =C2- =C2- =C2- =C2- =C2- =C2-
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ronics.com/Navigator?TeamGrumman-List href="http://forums.matronics.com">
http://forums.matronics.com href="http://www.matronics.com/contribution">
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Message 9
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
I didn't realize you were using someone else's plane for the certification
tests.
Cliff
----- Original Message -----
From: <teamgrumman@aol.com>
Sent: Wednesday, April 29, 2009 9:49 AM
Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey
says!
>
> Hi Cliff,
>
> My plane does have manifold pressure. As does the Tiger I flew with the
> 800. It's just that the Tiger used for the flight tests didn't. We
> didn't think it was necessary since the plane didn't come with it. We
> thought the POH was enough. Which it should be.
>
>
>
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Message 10
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| Subject: | why would I ask him? |
Because he is a very knowledgeable individual
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Message 11
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| Subject: | Re: why would I ask him? |
Hi,
=C2-Fred is a very funny fellow!
=C2-Brian Preston
----- Original Message -----
From: GOLDPILOT@aol.com
Sent: Wednesday, April 29, 2009 12:31:12 PM GMT -08:00 US/Canada Pacific
Subject: TeamGrumman-List: why would I ask him?
Because he is a very knowledgeable individual
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Message 12
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| Subject: | Re: Percent power. How to calculate? . . . Survey |
says!
The first plane to get my cowling, that is, a cowling that had been
conformed by the FAA to match the tooling and drawings I submitted
(even though my cowling came out of the same tooling) was Greg Ketell's
old plane, N1976T, currently owned by Jeff Keesaman from San Diego.
I've asked Jeff to post his experiences with the cowling on this forum.
Maybe he will someday.
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