Certification Project
Tripoli Level 3 for Mike Brest TRA #9383
Dynacom SAAB RB-05A (˝-scale)
TAP advisors: Tom Rouse, Ken Biba
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Installing The Motor Mount (cont)
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I finished
the epoxy work on the motor mount and the aft control fins. Also I filled the space between the motor tube
and airframe about half full with PML 2-part foam. For me, there was a bit of a challenge in getting epoxy and
foam down into the business areas between the motor and airframe. Keeping it neat is important to me in
general, but getting either foam or epoxy on the areas where the motor
retainer fits would be a problem.
What I came up with was a squeeze bottle & plastic hose to apply
the various goopy stuffs to just the right places. The squeeze bottles ($1 each at a restaurant supply) are the
kind you would see (as a kid) at a diner with catsup or mustard. The plastic hose, pushed on to the nipple
of the squeeze bottle, made a great little hand epoxy pump (seen below
left.) But the foam was a dodgy
process. Squeezing the foam out of
the bottle while it tried to expand in the bottle was kind of funny, and I
was pretty worried about experiencing a cato, so I wouldn’t recommend
it. While not as easily photographed now,
the photo below right does show the fin joint for the small aft “control
fins” between the motor mount and the airframe (and the foam if you look for
it.) |
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I finished
filling the airframe to Motor tube space with 2-part foam. Installed the aft centering ring, and the
tail cone / motor retainer threaded anchors.
It now looks like this picture (right-top). The paper liner that adapts the 4” tube
for 98mm motors is visible. |
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An
unexpected effect of this construction, with no paint yet, is that the fins
transmit light into the motor tube.
You can see that in this rather poor picture (left-lower). This is of course useless, but still
interesting. |
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