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teamgrumman(at)yahoo.com
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 Posted: Mon Jan 17, 2011 4:28 pm Post subject: Cowling update |
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This is just for the two people who ordered a cowling. {grin}
This weekend, Composite Dave and I fitted a cowling to my Tiger to verify the scribe lines. For all practical purposes, we fitted the cowling (all but the trim to fit on the upper cowlings) in two days; probably 10 hours total.
I wanted to fit a cowling to my plane because the 'trim-to-fit' scribe lines on the four cowlings I installed early last year were close, but not close enough. I probably spent WAAAAY too much time fitting the cowlings to those 4 planes because I didn't trust the trim lines. For these next two cowlings, I wanted to know where the trims lines were supposed to be. After installing one of the cowlings last year, I asked the Team for dimensions and spacers particular to different planes. I got a half-dozen responses; not really enough to make a statistical judgement.
My concern was that if I sent out a bunch of cowlings to be installed by someone not familiar with the installation, serious fitting mistakes might be made.
The final trimming, filing, sanding and fitting of a new Jaguar cowling to my plane came out to be right on the original trim lines (with the exception of the lower right hand corner). On the lower right hand corner, we had to sand/file 'into' the trim line by about .050 inches. So, if you drew a line between the top of the right side of the lower cowling (where it fits adjacent to the fuselage) and the bottom of the lower cowling, you'll see the new trim line taper to make the bottom a little shorter. Less than 16th of an inch. As fit, using 7/64 inch holes for #8 screws (so, there is a little play in the screw holes) the trim lines were very close. I was very surprised.
So, if you want to install the cowling with the cowling as fitted to my plane, installation is very straight forward. I'd trim to the outside of the trim lines on the sides and to the trim lines on the bottom. The biggest trial and error step is trying to work with something too big in two planes. (Geometric planes) Your most difficult decision will be how many shims to add/subtract from your engine mount to make your installation fit the Jaguar cowling.
If none of this makes any sense, don't worry. You're probably not alone.
By-the-way, Composite Dave was VERY surprised how difficult it was to decide where to file/trim and by how much. We must have spent a combined two hours discussing how much material to remove.
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Phil(at)ReliantAir.com
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| Posted: Tue Jan 18, 2011 7:49 am Post subject: Cowling update |
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Gary, Seems pretty clear to me. Use your trim lines, install cowl then shim motor mount to achieve correct spinner position. Am I missing something?
Phil
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Gary Vogt
Sent: Monday, January 17, 2011 19:22
To: Teamgrumman List
Subject: Cowling update
This is just for the two people who ordered a cowling. {grin}
This weekend, Composite Dave and I fitted a cowling to my Tiger to verify the scribe lines. For all practical purposes, we fitted the cowling (all but the trim to fit on the upper cowlings) in two days; probably 10 hours total.
I wanted to fit a cowling to my plane because the 'trim-to-fit' scribe lines on the four cowlings I installed early last year were close, but not close enough. I probably spent WAAAAY too much time fitting the cowlings to those 4 planes because I didn't trust the trim lines. For these next two cowlings, I wanted to know where the trims lines were supposed to be. After installing one of the cowlings last year, I asked the Team for dimensions and spacers particular to different planes. I got a half-dozen responses; not really enough to make a statistical judgement.
My concern was that if I sent out a bunch of cowlings to be installed by someone not familiar with the installation, serious fitting mistakes might be made.
The final trimming, filing, sanding and fitting of a new Jaguar cowling to my plane came out to be right on the original trim lines (with the exception of the lower right hand corner). On the lower right hand corner, we had to sand/file 'into' the trim line by about .050 inches. So, if you drew a line between the top of the right side of the lower cowling (where it fits adjacent to the fuselage) and the bottom of the lower cowling, you'll see the new trim line taper to make the bottom a little shorter. Less than 16th of an inch. As fit, using 7/64 inch holes for #8 screws (so, there is a little play in the screw holes) the trim lines were very close. I was very surprised.
So, if you want to install the cowling with the cowling as fitted to my plane, installation is very straight forward. I'd trim to the outside of the trim lines on the sides and to the trim lines on the bottom. The biggest trial and error step is trying to work with something too big in two planes. (Geometric planes) Your most difficult decision will be how many shims to add/subtract from your engine mount to make your installation fit the Jaguar cowling.
If none of this makes any sense, don't worry. You're probably not alone.
By-the-way, Composite Dave was VERY surprised how difficult it was to decide where to file/trim and by how much. We must have spent a combined two hours discussing how much material to remove.
| Quote: | | http://www.matronics.com/Navigator?TeamGrumman-List |
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[quote][b]
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teamgrumman(at)yahoo.com
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| Posted: Tue Jan 18, 2011 4:26 pm Post subject: Cowling update |
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Hi Phil,
No, that's the bottom line. I made it way too hard in the past.
Gary
From: Phil Kelsey <Phil(at)ReliantAir.com>
To: teamgrumman-list(at)matronics.com
Sent: Tue, January 18, 2011 7:47:28 AM
Subject: RE: Cowling update
Gary, Seems pretty clear to me. Use your trim lines, install cowl then shim motor mount to achieve correct spinner position. Am I missing something?
Phil
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Gary Vogt
Sent: Monday, January 17, 2011 19:22
To: Teamgrumman List
Subject: Cowling update
This is just for the two people who ordered a cowling. {grin}
This weekend, Composite Dave and I fitted a cowling to my Tiger to verify the scribe lines. For all practical purposes, we fitted the cowling (all but the trim to fit on the upper cowlings) in two days; probably 10 hours total.
I wanted to fit a cowling to my plane because the 'trim-to-fit' scribe lines on the four cowlings I installed early last year were close, but not close enough. I probably spent WAAAAY too much time fitting the cowlings to those 4 planes because I didn't trust the trim lines. For these next two cowlings, I wanted to know where the trims lines were supposed to be. After installing one of the cowlings last year, I asked the Team for dimensions and spacers particular to different planes. I got a half-dozen responses; not really enough to make a statistical judgement.
My concern was that if I sent out a bunch of cowlings to be installed by someone not familiar with the installation, serious fitting mistakes might be made.
The final trimming, filing, sanding and fitting of a new Jaguar cowling to my plane came out to be right on the original trim lines (with the exception of the lower right hand corner). On the lower right hand corner, we had to sand/file 'into' the trim line by about .050 inches. So, if you drew a line between the top of the right side of the lower cowling (where it fits adjacent to the fuselage) and the bottom of the lower cowling, you'll see the new trim line taper to make the bottom a little shorter. Less than 16th of an inch. As fit, using 7/64 inch holes for #8 screws (so, there is a little play in the screw holes) the trim lines were very close. I was very surprised.
So, if you want to install the cowling with the cowling as fitted to my plane, installation is very straight forward. I'd trim to the outside of the trim lines on the sides and to the trim lines on the bottom. The biggest trial and error step is trying to work with something too big in two planes. (Geometric planes) Your most difficult decision will be how many shims to add/subtract from your engine mount to make your installation fit the Jaguar cowling.
If none of this makes any sense, don't worry. You're probably not alone.
By-the-way, Composite Dave was VERY surprised how difficult it was to decide where to file/trim and by how much. We must have spent a combined two hours discussing how much material to remove.
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[quote][b]
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?TeamGrumman-List |
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