Probe and Pitot Tubes
made the Refueling probe and Pitot tubes out of brass and
aluminum tubing. The end of the refueling probe was
machined out of a bit of resin from the unused Cine-Scale
machine guns (they were static, and WAY too big) Once
I had penciled in lines on the fuselage, I cut elongated
holes- a bit at a time until the tube was parallel to the
centerline in both axes:
Pitot tube was cut to length, and placed properly- at the
right angle, I "tacked" them in with a few spots
of thick CA. This held them in position and gave me a
way to insure they were "just right" before
locking them in.
A small glob
of Aeropoxy locks the tubes in place so they can be worked
on. Naturally, this takes a day to cure.
epoxy is curing, I start making the bezels by cutting out
the slots for the tubes on the mill. The mill lets me
make a perfect, straight oval opening in a styrene panel.
the bezels have been attached, I mask them off for
filling. I fill the gaps with "Green Putty",
which dries quickly, and is very, very easy to sand. I
use the Evercoat Metal Glaze for large or deep fills, and
the Green putty for small nicks, or detail filling like
It will take
a couple of "passes" with the green putty to get
it just right, in the meantime, you can see I have tacked
down the Refueling Probe..
three of the tubes are set into the fuselage, bezels
installed and filled. Now, back to the inside.
tubes are certainly, sometime in the future- going to be
bumped, hit, or otherwise accidentally abused, we want them
to be mounted securely. To do this, I use a steel
brush in a dremel to take the surrounding area down to the
carbon around the spots where the tubes were Aeropoxied in.
another layer of Aeropoxy / Hysol firmly bonds the tubes to
the carbon shell, while distributing any impact over a much
larger area. Hopefully, this will prevent them from
breaking loose if there is a mishap. Having to fix the
"Hangar Rash" on the Coast Guard Dauphin has
taught me to make sure even the smallest detail is as secure
and properly mounted as the mechanics! In order to
keep the delicate aluminum tube ends of the tubes from
bending (they are sticking out and inviting damage0, I cut
off some old 1.5mm Allen keys and Aeropoxied them into the
tubes (recessed of course). Ever tried to bend an
Allen key? Those things are TOUGH!