Today's Message Index:
----------------------
1. 11:59 AM - Re: How to get airborn quick (923te)
2. 02:25 PM - RPM Indicator for Grumman GA7 Urgently needed (Shaun Wilkinson)
3. 03:52 PM - Re: RPM Indicator for Grumman GA7 Urgently needed (Andy Thomas)
4. 03:55 PM - Re: RPM Indicator for Grumman GA7 Urgently needed (Andy Thomas)
5. 05:49 PM - GA7 RPM Gauge Urgently Required (Shaun Wilkinson)
6. 06:42 PM - Inertial nav (Bruce Smith)
7. 08:49 PM - Re: Inertial nav (teamgrumman@AOL.COM)
8. 09:18 PM - Engine mount shims. Need help. (teamgrumman@AOL.COM)
9. 10:39 PM - Re: Inertial nav (MikeBabin@AOL.COM)
Message 1
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| Subject: | Re: How to get airborn quick |
http://tinypic.com/player.php?v z1ljn&s=6
Message 2
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| Subject: | RPM Indicator for Grumman GA7 Urgently needed |
Dear All,
Ive been given the teamgrumman info in the hope that you/somoene might
be able to help me.
I have a Grumman Cougar 1979 serial number GA7-0105 in the UK.
It went for its annual and someone has stolen the rpm guage along with a
few other items.
I have replaced everything but the rpm guage.
I cant get the annual finished till i have one !!!
I will pay for your services along with the part and mailing
Can anyone help in any way at all.
Kind regards
Shaun Wilkinson
Message 3
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| Subject: | Re: RPM Indicator for Grumman GA7 Urgently needed |
Shaun,
Is there an electronic indicator STC'd for the Cougar....
----- Original Message -----
From: Shaun Wilkinson
To: teamgrumman-list@matronics.com
Sent: Monday, March 08, 2010 9:13 AM
Subject: TeamGrumman-List: RPM Indicator for Grumman GA7 Urgently
needed
Dear All,
Ive been given the teamgrumman info in the hope that you/somoene might
be able to help me.
I have a Grumman Cougar 1979 serial number GA7-0105 in the UK.
It went for its annual and someone has stolen the rpm guage along with
a few other items.
I have replaced everything but the rpm guage.
I cant get the annual finished till i have one !!!
I will pay for your services along with the part and mailing
Can anyone help in any way at all.
Kind regards
Shaun Wilkinson
Message 4
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| Subject: | Re: RPM Indicator for Grumman GA7 Urgently needed |
Shaun,
Is there an electronic indicator STC'd for the Cougar....
----- Original Message -----
From: Shaun Wilkinson
To: teamgrumman-list@matronics.com
Sent: Monday, March 08, 2010 9:13 AM
Subject: TeamGrumman-List: RPM Indicator for Grumman GA7 Urgently
needed
Dear All,
Ive been given the teamgrumman info in the hope that you/somoene might
be able to help me.
I have a Grumman Cougar 1979 serial number GA7-0105 in the UK.
It went for its annual and someone has stolen the rpm guage along with
a few other items.
I have replaced everything but the rpm guage.
I cant get the annual finished till i have one !!!
I will pay for your services along with the part and mailing
Can anyone help in any way at all.
Kind regards
Shaun Wilkinson
Message 5
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| Subject: | GA7 RPM Gauge Urgently Required |
Dear All,
Ive been given the teamgrumman info in the hope that you/somoene might
be able to help me.
I have a Grumman Cougar 1979 serial number GA7-0105 in the UK.
It went for its annual and someone has stolen the rpm guage along with a
few other items.
I have replaced everything but the rpm guage.
I cant get the annual finished till i have one !!!
I will pay for your services along with the part and mailing
Can anyone help in any way at all.
Kind regards
Shaun Wilkinson
Shaun Wilkinson
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Message 6
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Gary,
Did the F-16s you worked with back in the day use any form of inertial navigation?
Reason I ask is, why hasn't someone married the accelerometers from an iPhone
and developed a GPS initialized moving map package based upon inertial nav?
I know that F-111s used it. OK, OK, probably hasn't been done because of money,
but is it technologically feasible?
Grumman Tigers and Cheetahs with moving map inertial nav........... hmm, that's
the ticket!
Bruce Smith
Message 7
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| Subject: | Re: Inertial nav |
Hi Bruce,
I was worked F-16 propulsion systems. The Pratt & Whitney 220/229 series
engines in particular. I worked radar nav systems in B-52, KC-135s, C-14
1s, C-5As and HC-130s about 100 years ago when they still used tubes and
magnatrons.
Gary
-----Original Message-----
From: Bruce Smith <haveblue1@mac.com>
Sent: Mon, Mar 8, 2010 9:34 am
Subject: TeamGrumman-List: Inertial nav
Gary,
Did the F-16s you worked with back in the day use any form of inertial nav
igation? Reason I ask is, why hasn't someone married the accelerometers fr
om an iPhone and developed a GPS initialized moving map package based upon
inertial nav? I know that F-111s used it. OK, OK, probably hasn't been do
ne because of money, but is it technologically feasible?
Grumman Tigers and Cheetahs with moving map inertial nav........... hmm,
that's the ticket!
Bruce Smith
Message 8
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| Subject: | Engine mount shims. Need help. |
Some of you may remember I asked what the distance was on your Tiger/Cheet
ah from the firewall to the back of the spinner (you know, the edge you'd
be measuring to if you laid a measuring tape across the top of the engine
from the firewall to the aft edge of the spinner. Don't make this harder
than it has to be).
NOTE: The original tooling was made on N28840. This plane had one shim on
the top of each mount. A splash made from that original tooling was fitt
ed on about a half dozen planes. I have pictures of it on John Bunker's
plane and Vi Bui's plane. They all fit fine. So, I finalized the toolin
g. From that tooling, a cowling was made and installed on N119ST. All of
my initial flights were with that plane.
My original question was a result of, during the fitting of Jaguar cowling
Serial Number: 0 on N1976T, I found that distance to be 39 3/4 inches.
Whereas, mine was 40 inches (mine has 2 shims on each top bushing). Thi
s made the 'trim-to-fit' lines on the cowling about useless. I added shim
s to the top engine mount bushings and that moved the engine down somewhat
. Still shy of 40 inches, but, not much. Fitting the cowling was still
a pain in the ass.
OK, so, then comes Serial Number 1: N3752W was 39 3/4 inches with one shi
m on each top. I added one shim each and that moved it to 40 inches. Sti
ll, fitting the cowling was odd because the trim line on the left side of
the cowling was right, but, the right side was 1/4 inches shy (meaning I
had to trim 1/4 inch more than indicated by the trim line). Along the bo
ttom, the trim goes from trim line to 1/4 inches forward.
I have a spare fuselage with an engine hanging on it. With one shim on ea
ch top mount, it was a little over 39 3/4, say 39 13/16. I added one shim
to each and got about 40 inches. Great. Or so I thought. I began fitti
ng a cowling for another plane using that configuration. Still, it was of
f about 1/4 inches on the right side.
Solution: I installed the cowling from my plane onto the spare fuselage.
The result was, in order to get the engine to align with the my cowling,
I had to add an additional 1/2 shim to the right and remove 1 shim from
the left. Both bottom mounts have 1 shim each.
I have N119ST in my hangar. It has no shims on the top left, one on the
top right and one each on the bottom mounts. That engine is 40 1/16 from
the firewall to the spinner.
So, please do my a favor, a big favor, and look at your spinner to nose bo
wl alignment. Then give me the following information.
Alignment: (e.g., aligned, spinner is to the right and down, etc.)
Distance from firewall to spinner: (i.e., measure from the firewall adjac
ent to where the hinge mounts and the aft edge of the spinner)
Then engine mount shim configuration:
Top Left: (e.g., 1 shim, 2 shims, etc)
Top right: ( same )
Bottom left: (same )
Bottom right ( same).
Bob S, you're a font of knowledge on lots of things. Do you know if there
are differences between the installed heights of any of the engine mount
vibration isolators? I know there a a couple of different part numbers
out there for Tiger/Cheetahs, do they have different installed heights?
You all (Y'all, Garner) might want to know why it makes a difference. As
installed, my prop spinner to cowling gap is about .100 to .120 inches.
Trust me, it makes a difference. Please, I need to know how much variat
ion there is in the installed distances.
Thanks in advance.
Gary
Message 9
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| Subject: | Re: Inertial nav |
In a message dated 3/8/2010 10:50:05 P.M. Central Standard Time,
teamgrumman@AOL.COM writes:
Gary,
Did the F-16s you worked with back in the day use any form of inertial
navigation? Reason I ask is, why hasn't someone married the accelerometers
from an iPhone and developed a GPS initialized moving map package based upon
inertial nav? I know that F-111s used it. OK, OK, probably hasn't been done
because of money, but is it technologically feasible?
Grumman Tigers and Cheetahs with moving map inertial nav........... hmm,
that's the ticket!
Bruce Smith
Bruce,
An inertial nav system requires a platform stabilized in space, plus
accelerometers in the x,y,and z axis, then a computer to integrate the
velocities. The iPhone could probably handle the computing, but what it lacks is
the
gyro-stable platform (and a third accelerometer). In a coordinated turn,
the iPhone's accelerometers won't sense the turn.
It's really a moot point, because at the speeds we're talking about, WAAS
GPS positional integration works about as well as an INS, both for moving
maps and as a jury-rig instrument panel, (Garmin 2-3-496 et. al). No
accelerometers required. The only real advantage of an INS is that it still works
when the satellites die.
There are several iPhone aps that use gps to drive moving aviation
charts... One of the better ones is SkyCharts.
Regards,
-Mike
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