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If necessary, sand to fit. When satisfied, remove the coupler from the top centering ring
and centering ring assembly with Kevlar cord. Next, place a mark 7.5” up from one end
of the coupler. You are going to permanently mount the coupler into the END OF THE
AIRFRAME WITH THE SLOTS FURTHEST FROM THE END and stop at the 7.5”
mark. Mix sufficient epoxy to completely coat the exterior of the coupler up to the 7.5”
mark and coat the interior of the CORRECT END of the airframe approximately 7.0”
down. Join the two epoxy areas together using a twisting motion to evenly distribute the
adhesive and push together STOPPING AT THE 7.5” MARK ON THE COUPLER. BE
SURE THE COUPLER DOES NOT SLIDE DOWN INTO THE FIN SLOTS.
WHEN
SATISFIED WITH THE POSITION, COMPLETELY REMOVE ALL EXCESS
EPOXY FROM THE INTERIOR AND EXTERIOR OF THE AIRFRAME AND
COUPLER. IT IS CRITICAL THAT NO EPOXY REMAINS INSIDE THE
COUPLER, THE FIN SLOTS OR THE EXTERIOR OF THE COUPLER.
If you
wish, you may temporarily tape these items together to retain position and allow the
epoxy to cure. Set aside and allow curing. When curing is complete,
TEMPORAILY
TEST FIT
by
first inserting the coupler centering ring assembly with Kevlar cord
attached to the motor tube/tailcone assembly
into the airframe to check the fit of the
forward centering ring and coupler centering ring assembly inside of the coupler. If
necessary, sand the centering rings and/or the interior of the coupler tube. When the fit
is correct, leave all assemblies together but pull out the upper coupler centering ring
assembly with u-bolts and Kevlar cord exposing the motor tube. Place a mark inside the
coupler along the top edge of the interior coupler centering ring. Next, rotate the
tailcone until the “witness marks” on the airframe and tailcone line up.
BE AWARE OF THESE MARKS, IT WILL BE NECESSARY TO LINE THEM
UP WHEN PERMANENT ATTACHMENT TAKES PLACE LATER.
DO NOT
EPOXY THE MOTOR TUBE/TAILCONE ASSEMBLY OR COUPLER
CENTERING RING INSIDE OF THE AIRFRAME YET!