Era Model Service
Quality Plan Sets for Radio Control Aircraft
Carl Goldberg's 1938 Comet Clipper
Bottom sheeting installed. Note that the sheeting stops at the
inner edge of the stabilizer perimeter parts. The upper sheeting
was also modified
to this join to conform
to the plan. Operator error! Otherwise the fit to the
saddle on the fuselage will be off. When sanding the stabilizer,
the 1/16 X 1/4 ribs will be removed but the plan is to leave as much as possible for better strength.
The final test fit. The fin and stabilizer will be covered before final assembly.
of the ribs have marks that align with the front edge of the trailing
edge parts and the aft side of the leading edge parts. To allow
gluing of the leading and trailing edge parts without gluing
to the "feet" that they rest on half circle reliefs have been cut in the gluing areas.
first step is to slide the upper spars through all the ribs of the
inner wing. A slightly loose fit makes for easier assembly.
This can be done by rubbing the spars in each spar slot
just to wear away a little material. If the spars fit too
tight you will not have a good time with this part. The spars
here were stripped out of 3/32 basswood sheet using a dremel table saw.
the main spars. Note that the blade is set to just barely reach
through the wood. This will give the smoothest cuts. The
board clamped to the saw was spaced from the blade by placing a known
3/8 wide block between it and the blade. A test cut was made and
was trial fitted in a rib. When the proper width was set, spars
the left hand holding the outer end of the basswood upper spars, ribs
are slid on from the butt end. When all of the ribs are
spaced about right, slip the balsa first and third spars in from the
butt end. This was a little tedious getting everything in the
approximate right places, but once done the wing becomes self jigging.
the spar fence using the laser cut 3/32 ply base and angle plates and
1/8 scrap balsa. Pin the fence down next to the line on the plan
as shown. This is the center of the middle rib. If you are
building a two piece wing you will have to space it back 1/32".
Two #1 ribs are supplierd for constructing a two part wing with joiners
at the middle but you will have to engineer the joiners yourself.
After making sure the inner wing section is over the plan
accurately, pin down the #10 rib and using a hot glue gun glue the
spars to the spar fence as shown. Make sure the main spar is all
the way up in the top of the slot in the #3 and #4 ribs so there is
room for the reinforcing spar that will be installed later.
# 10 rib pinned down. Note the pin sticking through the base at
the rear of the rib. There should also be one at the front of the
rib, that one was added after this photo.
The spars are longer than they need to be at this point, they will be cut to length in a later step.
all the ribs are in position and perpendicular to the building board,
apply Titebond III to the intersections. Be careful not to get
glue into the slots for the upper spar doubler that will be installed
later in the #3 and #4 ribs.
II Building Photos and Notes
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