User Manual

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Wing Center Section
35.
a. Install a piece of 9/32" o.d. x4" brass tubing into the holes in the W1A and
W1B ribs. Do the same for both inboard wing panels.
NOTE: Do not glue the brass tubes to the ribs at this time.
Next, slide the 1/4" music wire joiner inside the brass tubes, joining the two
inboard wing panels together.
b.
With the center joint firmly down against the workbench, block up each end
of the wing panels 1-1/2". Lightly tack glue the 9/32" brass tubing to ribs
W1A and W1B and allow the glue to dry. Extreme care must be taken to
insure that no glue is allowed to contact the 1/4" music wire!
36. Cut out the balsa fill-in pieces from the 3/8"x3"x4" printed balsa sheet and epoxy glue them in place. Also add a small piece
of scrap spruce, from the leftover wing spar material, at the outboard end of both brass tubes to act as a stop for the 1/4"
music wire joiner.
37.
Trim to fit and glue in place the 1/16"x1"x4" balsa shear webs at the locations shown on the plans.
Optional Spoiler Installation
IMPORTANT NOTE: If you have elected not to install the optional spoilers on your Riser 100, skip the following steps 38
through 43 and go directly to step 44 to finish the center section.
38. Two pieces of 1/4"x1"x12" balsa trailing edge stock is provided for making the
spoilers. Cut each to length as shown on the plans.
39. Notch the two center W-2 ribs of the spoiler bay to allow the spoiler to fit flush
with the top of the wing. Refer to the drawing "Cross-Section at Spoiler" on plate
2 of the plans for proper cut-out location and size.
40. Cut pieces of 1/16"x1/2" balsa sheeting to size and glue in place between the
ribs as shown on the plans.
NOTE: Leave a 1/32" gap all the way around the spoiler.
41. Turn the wing panel over and glue pieces of 1/8" sq. balsa against the
1/16"x1/2" sheeting just installed in the previous step. These will reinforce the
1/16" sheeting so that it will not bow or warp when the covering is applied later.
Make sure you cut the 1/8" sq. pieces to exact length to fit securely between the
wing ribs.
42. Cut a piece 1/4"x 5/16" balsa to fit between the two W-2 ribs that you previously
notched for the spoilers. Glue this is place where shown on the plan. This balsa
piece will serve as an end support for the plastic tubing called for on the plan.
Drill a 1/8" hole through the center of the 1/4" x 5/16" balsa to allow the plastic
tubing to pass through it.