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WarbirdKits T-34A Mentor User manual

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Copyright 2008 Thomas A. Jacoby and WarbirdKits.com
T-34A/B Mentor
1:12 Scale - BP-21 Brushless Motor –33.25 Inch Wingspan –Weight 18-20 ounces
Version 2.0 –15 November 2008
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 2
Materials
This kit contains the following materials:
This manual (via download)
Plan sheet
Laser-cut wood pack
Plastic canopy
Plastic cowl (two pieces)
To complete this kit, you will need the following additional
materials:
3/32” Aluminum tubing, 3”
1/16” Music wire, 20”
1/16” x 4” x 36” Balsa sheet, 4 each
3/16” x 3/8” x 36” Balsa stick, 1 each
1/8” x 2” Hardwood dowel
1/8” Square balsa stick, 1 each
1/8” x 1/4" Balsa stick, 1 each
1/4" Balsa triangle, 1 each
1ea Wing mounting bolt
Hinges (ailerons, elevator)
Miscellaneous servo mounting materials and pushrods
Covering materials, paint and glue
Electric power system –BP 21 CD-ROM Outrunner
NOTE: We recommend that you read this entire
manual before beginning construction.
Please note that this manual is laid out in two columns. All
steps are in order from top to bottom, left column first, then
right column.
Construction
Wing Skins
Each wing bottom skin consists of two laser-cut pieces:
forward and aft.
Lay the pieces of a wing skin on a flat board or table,
with the outer surface up. Run a length of masking tape
along the join lines. Turn the assembled skin over,
bend the joints open, and run a bead of aliphatic resin
or wood glue down the joints.
Lay the assembled skin back down on the board –
masking tape side down. Then weight it down and
keep the weight on the skin until it is completely dry.
When the skin is dry, remove the masking tape. Sand
the skin smooth.
Follow the same steps to assemble two wing top skins,
using your 1/16” x 4” x 36” balsa sheets.
Lay a bottom skin on a top skin. Trace the shape of the
bottom skin onto the top skin, adding a 1/4” margin at
the trailing edge. Cut out the top skin.
Cut each top skin into two pieces along the line
between the two W3 ribs.
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 3
Wing Panels
Pin the left bottom skin to your building board (over a
sheet of wax paper.
Glue the 3/16 x 3/8 balsa leading edge against the
front edge of the left bottom wing skin.
Glue W3 and W3A ribs together.
Assemble W2 through W7 ribs to the W8 spar. Glue
the ribs and spar to the lower skin.

Glue the W9 aileron spar and W10 aileron leading
edge in place.
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 4
Glue W1 and W1A ribs together. Note that W1 rib goes
toward the centerline of the aircraft.
Glue the W1 rib assembly to the bottom sheet and the
spar. The notch in the spar is cut at an angle to set the
dihedral.
Glue a scrap of 3/16 balsa to the top of the leading
edge between W1 and W2.
Make an aileron torque rod from 1/16 music wire and
3/32 aluminum tube. Install the torque rod and glue
only the aluminum tube bearings in place.
Sheet the outer portion of the wing panel from W3A to
W7.
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 5
Sheet the inner portion of the wing panel from W3 to
W1.
Cut the aileron free from the wing using the laser-cut
guide lines on the underside of the wing.
Sand the front of the aileron flat. Glue W11 aileron
leading edge in place. Drill a hole in W11 for the aileron
torque rod.
Bevel W11 along the hinge line. Install the hinges.
Open up the aileron servo cutout in the W1 ribs and
upper sheeting.
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 6
Notch the wing leading edge for a 1/8 dowel.
Sand the wing leading edge to shape.
Repeat these steps for the right-hand panel.
Glue the wing panels together. Reinforce the join with
1/2" fiberglass tape and epoxy.
Install the 1/8” dowel in the leading edge. The dowel
should project about 1/4” forward of the wing.






Glue the wingtip parts WT together –two for each side.
Glue the wingtips to the wings, then sand them to
shape.
Cover the wing as desired.
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 7
Fuselage
Glue the F11 wing saddle doublers to the fuselage
sides. Be sure to make a left side and a right side!
Glue 1/4" balsa triangle sticks to the bottom inside
edge of the fuselage sides, from the rear of the wing
saddle to the tail.
Glue 1/8” square balsa reinforcements to F2, F3, F6
and F8 formers.
Pin F14 cockpit floor in place over the plan.
Glue F6 former to F14 cockpit floor. (Note that you are
building the fuselage upside down.)
Score the outside of the fuselage sides in line with the
aft edge of the F6 former location. Repeat at the
forward edge of the F2 former location. This will let you
pull the fuselage sides together at a later step.
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 8
Glue the two fuselage sides to F14 and F6.
Glue F3 and F2 formers in place.
Glue F8, F9 and F10 formers in place.
Glue the two F1 formers together. Make sure that the
motor mount holes line up, and that they fit your choice
of motor.
Glue F12 to F2.
Pull the front fuselage sides together and glue to F12.
Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 9
Glue F1 in place.
Glue F2A, F3A, F4, F5 (2 each), F7A, F8A and F9A in
place.
Glue a 1/8” x 1/4" stick in place between F7 and F9A.

Sheet between the two F5 formers with 1/16” balsa.

Assembly Manual for T-34A/B
Copyright 2008 Thomas A. Jacoby and WarbirdKits.com 10
Sheet the top of the fuselage between F2A and F3A,
then between F3A and F4, and finally between F7 and
F9A.

Cut and glue 1/2" wide strips of 1/16” sheet along the
cockpit sides. Alternatively, glue in 1/4" X 1/2" balsa
sticks and sand to shape.

Put the wing in place on the fuselage and adjust the
hole in F3 until the wing fits correctly. Glue the F3B ply
doubler in place, but don’t glue it to the dowel.

Sheet the fuselage bottom between F2 and F3 with
1/16” balsa.
