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Sukhoi SU 31M

Preparation

Before starting construction connect the stand plates (1 + 2) using two lengths of hardwood

dowel (pieces of broom handle), ensuring that the fuselage fits between the plates with the

wing fitted.

Use 5-minute epoxy for all joints unless stated otherwise.

You will need four servos 30 mm long and 12 mm wide, with an output arm length of 15 - 18 mm.

For painting Depron parts (bottom wing fairing) we recommend water-based acrylic paints.

Photographs of the various stages of construction are printed on the sides of the kit box.

Fuselage

The first stage is to reinforce the fuselage (3) with several wooden parts. Glue part (8) across the

fuselage at the front, and the two side doublers (9) on either side (Figs. 8, 9 + 10). Note that the lugs

and notches of these three parts should slot together accurately. Slot the undercarriage support (10)

into the notches in parts (9), and glue it to the doublers and the fuselage (Figs. 10 + 11). Glue the two

captive nuts (39) to part (11) and glue this reinforcement in the fuselage over the undercarriage

support (10), working from above (Fig. 13). Screw parts (10 + 11) together using the nylon screws

(41). Glue the flight battery support (12) in the fuselage from the underside (Fig. 12). The stop-piece

(13) for the battery should not be glued in place until the model's Centre of Gravity has been

established, in case the battery needs to be shifted further forward.

Glue the balsa screw supports (14) on both sides of the fuselage (3) at the nose to accept the cowl

screws (Fig. 17).

Glue the tailskid support plate (20) to the underside of the fuselage (Figs. 19 + 20), and glue the

tailskid (21) to the plate once the glue has set hard. Cut out the tailskid fairing (22), paint it, and fix it in

place using scrap decal sheet material.

The motor mount is assembled from parts (15 - 19). Sand the dark coloration from

the cut edges and remove dust before gluing. The motor mount plate (15) must be

positioned with the two slots on the left and the single slot on the right. Glue part

(16) in place with the two lugs on the left, and part (17) with the single lug on the

right (Figs. 14, 15 + 16). Glue parts (18 + 19) in place. Note that part (19) has one

angled edge to allow for the 2.5° right-thrust; this edge must be glued to part (18).

Glue the motor mount to the front face of the fuselage, aligning the pointed part of the motor mount

plate (15) with the fuselage moulding seam on both sides. This automatically sets the correct height,

so all you have to do is centre the motor mount. Secure the motor mount carefully so that it cannot

shift while the glue is setting.

Screw the two canopy retainer band hooks (49) in the balsa plates (50), and glue them on either side

of the fuselage below the canopy, adjacent to the battery compartment (Fig. 18). One hook should be

fitted to the balsa plate (51) and glued in the fuselage behind the canopy, between the vacant servo

wells and the control "snakes" (Fig. 18).

Glue the four threaded plastic sleeves (42) for the wing retainer screws in the fuselage (3) and to the

fuselage side doublers (9).

Tailplane and elevators

Apply the film strips (57) to the top surface of the tailplane to act as hinge reinforcements, with half

their width (20 mm) on the tailplane, half on the elevator.

Position the GRP horn (32) half-way along the CFRP tube (6) and glue the CFRP tube to the two

elevators (still attached to the tailplane (5)), with the GRP horn located in the circular recess (Figs. 1, 2

+ 3); note the angle of the horn (Fig. 3). Take care that no glue runs into the second channel (hinge).

Separate the two elevator panels from the tailplane at both tips using a sharp knife (Figs. 3 + 4). Cut

away the central area between the two elevators (Fig. 3); at a later stage this part is glued to the tail

end of the fuselage.

Building instructions - Sukhoi SU 31M