Great Planes Ultra Sport 1000 Kit - GPMA0425 User Manual

Page 9

D 8 From the 1/16" x 3" x 30" balsa sheets, cut four

12" lengths Edge glue these sheets together in pairs

to make two 6" x 12" sheets, and sand both sides
smooth with a sanding block

D 9 Lay the rudder framework on the sheeting, mark
the outline, and trim the sheeting to the approximate
outline Leave the sheeting slightly oversize to allow
for positioning.

BUILD THE FIN

NOTE: You will construct the fin framework and add

the 1/16" balsa sheeting, then, you will add the 3/8"
balsa leading edge and fin top.

D 1. Cut the remaining 1/4" x 3/4" balsa stick to make
the fin trailing edge.

D 2 Edge glue the two 1/4" x 3-1/4" x 1-1/2" balsa
blocks together to make the 6-1/2" x 1-1/2" fin
bottom Cut off the ends of this sheet to match the
plan Pin the fin bottom and trailing edge to the plan.

D 3. Complete the fin framework by cutting and fitting

pieces of 1/8" x 1/4" balsa, as shown on the plan.
Glue this assembly together.

D 4 From the remaining 1/4" x 1" balsa stock, cut a
gusset to fit in the lower front corner of the fin Glue in
place

IMPORTANT NOTE: It is essential to get a very
good glue bond between the rudder framework and

the sheeting

D 10. Securely glue the 1/16" balsa sheeting to one
side of the rudder framework

D 11. Trim and sand the edges of the sheeting flush
with the perimeter of the stab framework.

D 12 Repeat steps 10 and 11, sheeting the other
side of the rudder.

D 13 Sand the leading edge of the rudder to a "V-
shape" and sand the trailing edge to a rounded shape
(see the rudder cross-section on the plan) Leave the

top and bottom edges square.

D 5. Remove the fin framework from the building
board, sand both sides smooth, and sheet both sides
of the fin with 1/16" balsa in the same manner as the

rudder The fin can be sheeted using only one of the
1/16" x 3" x 30" balsa sheets

D 6. Glue the 3/8" x 1-1/2" x 10-1/2" balsa fin leading
edge to the front edge of the built-up fin.

D 7 Trim off the top and bottom of the leading edge

to match the plan Sand both sides of the fin smooth