Use this photo for the next three steps.
❏
9. Glue the 1/4” x 5/8” x 4-3/8” [6.4 x 15.9 x
111mm] balsa
TE center brace
to
the front
of the
stab TE spars of both stab halves.
❏
10. Glue the die-cut 1/16” [1.6mm] plywood
TE
doubler
to
the front
of the TE brace (it’s the one with
straight edges).
❏
11. Add the die-cut 3/32” [2.4mm] balsa
center rib
S1S
and glue it into position.
❏
12. Sand the fronts of the ribs to match the aft
sweep of the leading edge. Cut two shaped 5/16” x
15” [7.9 x 381mm] balsa
stab/fin leading edges
to
a length of 13-3/4” [349mm] and bevel the joining
ends to match the plan. Glue them to the ribs and the
LE brace so the
top
edge is
even
with the
top
of the
ribs. The bottom will extend below the ribs but will be
sanded flush later.
❏
13. Cut a 1/16” [1.6mm] notch in center rib S1S
behind the LE brace. Test fit the die-cut 1/16”
[1.6mm] plywood
LE doubler
in the notch. Deepen
the notch as necessary so the top of the doubler is
even with the top of rib S1S. Glue the doubler to the
LE brace and glue rib S1S to the doubler.
❏
14. Cut the end off both die-cut 3/32” [2.4mm]
balsa
S1AS ribs
at the embossed line and set those
little pieces aside. They will be used later to glue the
aft end of S1AS into position. Fit the S1AS’s to the
elevator LE spars, pin them to the plan, and then
glue them to the elevator LE spars.
❏
15. Sand the top of the leading edges, stab and
elevator spars, and the TE brace so they match the
contour of the ribs. Do not change the shape of the
airfoil by sanding too much.
❏
16.
THIS STEP IS VERY IMPORTANT!
Arrange
the T-pins so
every other rib
is held down with one
pin near the front and one pin near the rear and
make sure all the pins go into the jig tabs
at the
same angle
. This will allow you to remove the stab
from your building board by lifting it up and to one
side after the top sheeting is glued in place (because
the T-pins are concealed).
❏
17. Use your favorite method to glue the stab skin to
the stab.We recommend using aliphatic resin to glue the
skin to the ribs and TE spar, and medium CA for only the
leading edge. Apply glue to the stab structure. Working
quickly, position the stab skin and hold the leading edge
down until the CA hardens. When the CA is hardened,
wet the front of the skin with a 50/50 mix of alcohol and
water and press it to the rest of the frame, holding it
down with weights until the glue dries.
Note:
If you choose to use CA for the entire job, be
aware that residual accelerator you may have used
earlier can make the CA you use for this step cure
quickly. You’ll have to work rapidly.
❏
18. Glue the elevator skin to the elevator. You can
use CA for this step since the skin is small and easy
to position. Make sure the trailing edge contacts the
stoppers on the top of the jig tabs on ribs S7S and
S2S.
Note:
You may have to trim the LE of the skin
to fit it into position.
-12-
Summary of Contents for T-34B MENTOR
Page 7: ...7 DIE CUT PATTERNS...
