Era Model Service
Quality Plan Sets for Radio Control Aircraft
Carl Goldberg's 1938 Comet Clipper
the trailg edge shaped, the wing was stood up on the traing edge
between 3 carprnter's squares and the 1/16 balsa shear webbing was
installed on the front of the main spars. Then the leading edge
was sanded to contour.
balsa sheet is being installed between the three center section
ribs. Only a little sanding was necessary on the joint to the
center rib, and it was glued in place with thin CA. Pins were
stuck through from the bottom on the inside edge of the second rib and
the sheet was sawed off on the outside of the pins from the top
side. All the sections were installed in a similar maner, front
to back on the top. Once all was installed, the joins were
glued again with thick CA on the bottom. No sheeting is installed
on the bottom of the wing.
ply joiner plates are installed at the center section. Epoxy used
here. Be sure to get the doublers centered well as the #2 ribs
rest against the #1 and #3 spar doublers.
root of the elevators were drilled for a 3/16 (5mm) carbon fiber
tube. The bore should be centered on a round radius shaped on the
leading edge of the elevator, closer to the back of the spar than the
parts of the elevator join before assembly. The brass tubing is
3/16 ID, 7/32 OD. The sheet for the bellcrank is .032.
silver bearing solder to assemble the elevator control horn. It
is available in 2 or 4%, either will be strong enough but the more
silver the higher the strength. Drill the holes for the
clevis connector before assembling the elevators.
The joined elevator in clamped in the proper position. Keep the
bellcrank as close to the edge of the lower sheeting as you can.
Put some balsa spacers between the tubing hinge sleeves and the
stabilizer spar so the elevator spar in 1/32 or more back from the
stabilizer rear spar. Note the balsa spacers establishing the
distance. Sand the spacers to the proper thickness and glue them in,
using thick CA, surronding the brass tubing with the CA but do not
allow glue to contact the carbon fiber joiner. At this point the
carbon fiber tube is not yet glued to the balsa elevator spars.
Next, using thin CA glue the elevator bellcrank to the carbon fiber
tube. Drill a hole through the belllcrank tube and cabon fiber
joiner and put a pin in to keep the bellcrank secure from rotation
relative to the carbon fiber tube. Rotate the
bellcrank so it is 90 degrees from the elevator for aft centerline,
set the end cleances at the tip and root of the elevators, and then
securely glue the carbon fiber tube to the balsa elevator spars.
off T-pins were used for the tip hinges. There is
enough flexibility in the elevator to pull the tip above the
stabilizer. Center the pin on the shaped leading edge radius and
press it in about 1/2 inch, then remove it. Put the
elevator in proper position and insert the pin, with the free end
of the pin extending about 3/16 inch past the outside edge of the
stabilizer rib. Make a piece of lite-ply that will fit on the
outside edge of the rib, drilled for the pin. Slide it around
until the elevator is in position and glue it in place.
Glue a piece of 1/16 balsa against the end of the pin to retain
it. See the next photo for a view of the completed outer elevator
II Building Photos and Notes
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