Balsa Taube 40 Assembly Manual - page 9
21.) Use the 1/4 x 1/4 x 15 for the upper wingtip spar. Cut the
angle at the front of the spar so it will fit flush against the back
side of the front spar. Trim the rib notches at an angle for the spar
so it will fit in place properly. Taper the outer end of the spar as
shown in the “wingtip spars” detail drawing on the plans. When
everything fits, glue it in place.
22.) Cut the 1/4 x 1/4 x 24 spar so it will fit flush against the
wingtip spar and glue in place.
23.) Plane or carve the LE corner to match the leading edge. Do
the same with the wingtip LE. Shave it down from rib W-5 to the
tip, flattening it out until it is flat at the tip. Be careful that you
don’t break the ribs.
24.) Remove one wing panel from your building board. Block
the wing up so it is 1-1/4” high under the double rib as shown
above. Sand the upper spars on the wing root lightly (sand a little
on each panel) until the spars LE’s and TE’s fit together at the
centerline. Check for proper alignment along the LE and TE to
assure that the wing is indeed straight. When assured that it is,
glue the spars, leading edges and trailing edges.
25.) Glue the front part of the three piece center ribs in place. Be
sure to center it on the leading edge.
26.) Glue the 1/8” plywood dihedral brace in place to the back
side of the forward spars as shown above. The top of this part
must be centered on the spars. The top edge should be 3/32”
below the spars and level with the ribs on each side. The center
section sheeting will sit on top of the dihedral brace and will be
flush withe the spar. See Step 29.
27.) Glue the smaller rear dihedral brace in place exactly the same
way.
28.) Glue the other two pieces of the center rib W-6 in place. Be
sure to center these up on the dihedral braces.
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