Cowl Alignment and Mounting
   One of the more difficult tasks in scale modeling is setting up the cowl alignment for mounting. I was looking
around the E-Zone ( the other day and happened to spot this method for cowl mounting
that TreeDiver has been using for awhile and was so impressed I asked him if it would be OK to post up the idea
for others to use. It is with his blessings that we proceed.

The first problem usually encountered in mounting a cowl is centering the prop shaft in the opening and keeping
it centered while the mounting screw holes are located and drilled. This method is so simple, I don't know why
even the Wright Brothers didn't use it on the original '03 Flyer -- oh wait, the flyer didn't have cowls?? Well
anyway, the key to this slick little method is a simple foam disk fitted into the prop shaft opening in the cowl and
slipped over the prop shaft to keep it the opening centered while the cowl is being fitted to the fuselage (or
nacelle for twin and multi-engine configurations). Here's how it works;
Begin by measuring the opening to determine the size of
disc required. A caliper works best, but a ruler or drafting
circle template will do nicely as well.
Items required to get started;

A-    3 or 4 MM Depron foam or Artists Foam Board (the
kind used for making bowed outline patterns).
B-    A measuring device used to determine the the
diameter of the cowl opening
C-    A compass, or drafting circle template to size the disc
to fit the front cowl opening.
D-    A sharp knife to cut the disc from the foam sheet.
E-    The appropriate size drill bit to drill the disc for the
prop shaft.
Draw the proper diameter circle on the foam and mark the
center point of the disc. Using a compass the center hole
will be clearly visible. If you use a drafting circle template
you'll have to find the center after the circle is drawn.
Cut the disc out of the foam and drill the center hole. Now
you can fit the disc into the opening in the cowl, trimming
as needed for a good snug fit.
With the disc fitted into the cowl, slip the cowl assembly
onto the prop shaft and align it on the fuselage. Drill the
mounting holes and screw the cowl in place. And finally,
remove the disc and the job is done.