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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Now to start the ugly work…Parts
Prep: All the parts are fiberglass so that
means I need to start by prepping the surfaces that will be epoxied. Such as where the motor mount bonds to
centering rings and the root edges of the fins, the centering rings, the
inside portion of airframe that bonds to the centering rings, the fin-tangs
(parts that protrude through the airframe), the inside and outside of the
airframe around the fin slots.
Ultimately I went ahead & roughed up the entire fin surfaces, as
well as the motor mount tube & the body tube. |
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Above left center & right, are
various parts after I started scuffing & sanding the surfaces in prep for
bonding. Directly left & right
are inside and outside views (respectively) of the main airframe body tube. |
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Fin Attachment
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I made a
rather crude jig (Left) because that was all that was necessary, to align the
fins. Then CA tacked the main fins in
place. When sticking the fins, I put
the centering rings and motor tube inside so that the fin depth would be
right, but I was careful to not allow any CA to adhere to any of those parts. This
allowed me to remove the motor mount (Right), so I can get in there to do
some serious epoxy/glass work to hold the fins in solidly. |
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In the
first step of this process I installed the two forward centering rings in the
body tube butted to the forward and aft edges, of the forward main fin tang
shown from the front (left), and from aft (right). |
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The cables
seen in the above pictures were intended by Dynacom to be recovery system
mounting points. The padlock was used
only to rest the cable in a proper orientation while epoxy cured. These pictures show the first application
of internal fin fillets. |
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