Today's Message Index:
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1. 12:48 AM - Re: Re: Rigging (teamgrumman@aol.com)
2. 01:06 AM - Re: New Cowl (teamgrumman@aol.com)
Message 1
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I looked at my plane and my tab makes my aileron very slighly down. If
I thought there was a knot in it, I'd change it. Right now, everything
is pretty close to flat when straight and level.
-----Original Message-----
From: pitts_pilot@bellsouth.net
Sent: Fri, 23 Mar 2007 9:18 PM
Subject: Re: TeamGrumman-List: Re: Rigging
I didn't read Davids reply, but I believe the reason for two trim
tabs stems from the fact that the only difference between the left and
right aileron is the location of the drain holes. Both ailerons are
made the same up to the point of the drain hole 'installation'. I
found a lot of interesting construction 'constraints' in the Grummans
that reduced the manufacturing parts count. A lot of parts are
interchangeable and some with minor mods. The rudder and elevator are
interchangeable on the -1s and that part is modified with the trim tab
for the other elevator. The vertical fin and the horizontal stabs are
interchangeable. The wing is designed to use two sheets of 4'X8'
aluminum for skins so no custom aluminum sheet is needed. There may be
more 'similarities' that I've missed.
Linn
Ian Matterface wrote:
I asked the question "why two aileron trim tabs" of the AYA back in
94. Dave Fletcher replied and you can see the full text if you are a
AYA member on their web site. Download the General Section of the
Maintenance Compendium page 15.
Part of Dave's reply was, "The preferred setting for the trim tabs is
to reduce lift on one aileron, rather than increase it on the other.
How you trim depends on which wing is heavy." and "Remember: bend the
tab in the direction you want that wing to go, and remember that
bending one tab down, which decreases that wing's lift and drag, is
preferable to bending the other tab up, which increases lift and drag
for that wing." So may be that last quote is the reason for two, if I
read that correctly, ideallyone should always be neutral and the other
down depending on which wing is heavy.
Ian
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Message 2
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Hey Brian, sounds like you're a busy guy. Dave, the composite guy who
makes the cowling, is in the process of making the second (lastest
version) cowling. The cowling I used on your plane was sacraficed for
the greater cause.
As for a-w-h-i-l-e, it took me two weeks to fit the cowling to my
plane. Then, once the basic fitting was done, all of the harware was
installed. The next one, your's, shouldn't take that long. The thing
is, it will take Dave a few weeks to make all the parts. Plus, he's
working every other week in Mississippi.
I'll catch up with Dave tomorrow and get an estimate on how long it
will take to get all the parts together. There are 12 pieces to
fabricate, plus all of the baffles to fit.
To answer your question regarding when it will be ready to install, all
I can say is, "as soon as I get the parts." During the installation
and fitting on your plane, I'll be making drawings of the installation
and taking pictures for the installation instructions.
The cowling I install after yours is for a 6-cylinder Tiger. That will
require a one-time STC. Sounds like fun doesn't it.
My guess is, I'll get the first of the production cowlings in about a
month.
If you can bring the plane up and leave it for a month or so once I get
the parts, that would be awesome.
Gary
-----Original Message-----
From: sandbag23@msn.com
Sent: Sat, 24 Mar 2007 9:08 AM
Subject: TeamGrumman-List: New Cowl
<sandbag23@msn.com>
Very glad to hear that we're ready to re-install your cowl on N119ST.
About how long is a w-h-i-l-e? I'll need to coordinate the time off for
the cross country flights with my squadron. The annual is due in July
and since Bill Hatton is no longer running a shop nearby I'm looking
for a mechanic. It makes sense to complete the inspection at the same
time as the install.
I'll order a PowerFlow and have it sent to your shop. The new paint
job is PPG Aerospace "Chevron White" which should be the standard Chevy
white for matching purposes. We can worry about the blue trim later.
I'm working in Florida at the moment, have commitments in Maryland all
next week, could possibly run the plane out on 31 March if you're ready
for it. I have my cell on me, (619) 392-5911.
-Brian
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