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24.
Dry fit the other carbon fiber spar into the top notches of the ribs against the sheer web.
Be sure to seat it completely along its length from R9L to R9R.
25.
When all is as it should be, remove the CF spar, roughen it and glue it in place using
medium CA. Check to ensure that it is flush with the top of the sheer web. Use clamps
between the ribs to assure a good bond to the sheer web.
Leading Edge, Spoiler Box, and Wing Hold Down Support Plate
1.
Locate the stick bundle with 10 rectangular balsa sticks and remove the two longest ones
(~860 mm) (~33.75”).
2.
Securely pin the narrowest one (~8 mm) (~3/16”) edge-wise against the front of the ribs
as a sub-leading edge ensuring that the bottom sheet is flat against the building board.
Do Not press down to hard or you will separate the bottom sheeting from the ribs. Check
to see that the stick is tight against the front of the ribs. The bottom sheeting will extend
beyond the sub-leading edge.
3.
Use thin CA to attach the sub-leading edge to the ribs and bottom sheeting.
4.
Before removing the wing from the board, double-check to see that all joins are securely
glued. It’s easy to miss one.
5.
Remove the center section from the building board and plane/sand the sub-leading edge
to match the contour of the ribs.
6.
Fit the spoiler box floor between the two R3’s. Be sure to set the “U” notch with the
opening toward the leading edge. Bend the balsa floor slightly to get the tabs to insert
into the ribs.
NOTE:
Carefully press the box floor down until it makes full contact with
the ribs all along its length. Be patient and do not force it! It will fit. Trim the notches
slightly if needed.
7.
Check one more time to ensure that the floor is seated against the ribs, then secure it in
place.
Figure 21: Center Section with Completed Spar Less Spoiler Box and Leading Edge
