Balsa Taube 40 Assembly Manual - page 16
37.) Draw a vertical centerline on
the 1/4” plywood firewall. Draw
a horizontal (thrust) line 1-3/4”
up from the bottom edge of the
firewall. Line up the engine
mount you have chosen using
these lines and drill the mounting
holes.
38.) Remove the mount and drill
out the motor mount holes with a
5/32” drill bit. Press four 4-40
blind nuts in place. Be sure to glue the back sides of the blind nuts
using a few drops of thick CA or epoxy so they can’t back out of
the holes. Take care not to get any glue in the threads.
39.) If necessary, sand the sides of the firewall until it drops into
place in the fuselage. When it does, glue it in place. On some
models it isn’t unusual for the firewall to be slightly above the
fuse side because of the odd shape of the fuse. This will not
present a problem.
40.) Fit your engine and fuel tank, then drill whatever holes
necessary in the firewall for the fuel lines to pass.
41.) Mount the servos in the fuselage wing opening. We
recommend using the servo trays made for your radio equipment.
An Airtronics installation is shown above. Use the 1/4 x 3/8 x 12
basswood supplied for servo rails. Fit the throttle pushrod as
shown above. Use a solder link at the servo end and a nylon link
on the throttle arm on the carburetor. Depending upon which
engine you decide to use, you may have to adjust the pushrod up
or down so it will line up with the throttle arm. We had to put a
“Z” bend in the pushrod to raise it slightly for the proper height.
42.) Use the 3/16 x 3/16 x 18 between formers F-3C, F-3A, and
F-2B as shown above. Fit these pieces carefully as you don’t want
to push formers F-3C and F-2B out of alignment.
43.) Use a straight edge to draw a line on the wing from former
F-3A forward about 4”. Be sure the front of the straight edge is
lined up with the edge of former F-2B. Do this on both sides of
the formers as shown.
44.) Cut the 1/8 x 1/8 x 30 balsa strip to fit between formers F-
3A and F-3C as shown above. Be sure the strip is flush with the
outside edge of the formers. This will be used as a gluing strip for
the top deck sheeting later in construction.
45.) Cut two pieces of the 1/8” square balsa 4” long and glue
them from former F-3A forward on the line you drew in step 43.
46.) Fit a piece of 3/16” square balsa between the tops of formers
F-2 and F-2A. Add the 1/8” square gluing strips between the
formers on the tops of the fuse sides as pointed out above.
47.) Double check the fit of the wing to the fuselage wing saddle.
Check and make sure that none of the formers have moved out of
place.
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