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grs-pms(at)comcast.net
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 Posted: Mon Jul 03, 2006 2:54 pm Post subject: Fitting Stratus/601 cowl |
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I'm encouraged by the good responses to my cowl questions. Here is another:
Is it best to assemble the two halves of the cowl on the work table and somehow clamp or cleco them together before fitting one or both to the fuselage? With the Stratus engine in place it isn't possible to fit the lower cowl to the fuselage without trimming it to clear the various "lumps" on the engine. Trimming the lower cowl seems to be a cut and fit sort of process. Also, it seems to be necessary to establish the position and slope of the upper cowl pretty early in the process. Any advice from those who have been there already?
George Swinford
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larry(at)macsmachine.com
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| Posted: Mon Jul 03, 2006 6:28 pm Post subject: Fitting Stratus/601 cowl |
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George,
The slope of the upper cowl is the first issue. Trying to keep the
lower edges of the upper cowl level with the longerons, plus or minus a
quarter of an inch at the front,
the upper cowl has to be the first piece. You've got the most room at
the top, but the cowl will look strange if it isn't level at the joining
edge and parallel with the forward top
skin on the top. This requires you get some duct tape and position it
first on top of the engine if your engine is mounted.
Once you've worked top down, it's time to find the spots that need
clearance to get the bottom to come up around the engine and get mating
surface underlap with the top cowl. The engine also has to have
3-degrees offset for prop torque and can be down as much as 2 degrees to
get the prop flange and spinner to align with the cowl.
If you were making an engine mount, it'd be better to pivot around the
front flange and swing the rear of the engine to keep the spinner in the
center of the cowl. As most have
found, the Zenith mount with Stratus engine can be offset up front by as
much as 3/4-inch. You might find it easier to remove the exhaust pipes,
muffler and valve covers while doing this fit up. This will initially
allow you to focus on fewer items like the oil pan. Then mark the spots
of contact and consider how much is needed to get around them.
Well, you get the drift of what is needed, but it's easier top down and
you'll fit these a good many times to compile the best position before
you start anchoring things with
fasteners. I found the places that would ultimately become center
positions for Dzus fasteners and drilled an 1/8-inch hole for clecos to
first secure things. It does get close everywhere, but you can get it
all to fit if you plan ahead before drilling for the clecos.
Larry McFarland - 601HDS at www.macsmachine.com
George Swinford wrote:
| Quote: | I'm encouraged by the good responses to my cowl questions. Here is
another:
Is it best to assemble the two halves of the cowl on the work table
and somehow clamp or cleco them together before fitting one or both to
the fuselage? With the Stratus engine in place it isn't possible to
fit the lower cowl to the fuselage without trimming it to clear the
various "lumps" on the engine. Trimming the lower cowl seems to be a
cut and fit sort of process. Also, it seems to be necessary to
establish the position and slope of the upper cowl pretty early in the
process. Any advice from those who have been there already?
George Swinford
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jeffrey_davidson(at)earth
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| Posted: Tue Jul 04, 2006 6:46 am Post subject: Fitting Stratus/601 cowl |
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RE: "Is it best to assemble the two halves of the cowl on the work table
and somehow clamp or cleco them together before fitting one or both to
the fuselage? "
For an idea of how to hold the front of the cowlings in place using a collar
around the prop hub as you do the fitting, take a look at the JabiruUSA web
site page at the following URL:
http://www.usjabiru.com/Zenith%20FWF%20Images/Fit%20Cowls.pdf
Jeff Davidson
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grs-pms(at)comcast.net
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| Posted: Tue Jul 04, 2006 9:36 am Post subject: Fitting Stratus/601 cowl |
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Thanks Jeff:
What a professional set of instructions! I wish Zenith and Stratus would
have done half so well. The fixture for the cowl front doesn't apply to the
Zenith-furnished cowl, but the other material is useful. Thanks for
bringing it to my attention.
George
Do not archive
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