Multiplex Technology 21 4211 Specification, Before starting construction, Installing the servo

Specification:
Wingspan	1010 mm
Fuselage length overall	820 mm
All-up weight min.	580 g
Wing loading (FAI) min.	26 g/dm²
Power system min.	Permax 400 6V
RC functions	Elevator, rudder
and throttle; optional ailerons

Important note

This model is not made of styrofoam™! It is not possible to glue the material using white glue or epoxy. Please be sure to use cyano-acrylate glue exclusively, preferably in conjunction with cyano activator (“kicker”). For all joints use medium-viscosity cyano-acrylate (“cyano”). When gluing Elapor® always use this procedure: spray one surface with activator, allow it to air-dry, then apply cyano to the other side. Join the parts and position them accurately immediately.

Please take care when working with cyano adhesives. These materials harden in seconds, so do not allow them to get onto your fingers or other parts of your body. It is important to wear goggles to protect your eyes. Keep the adhesive out of the reach of children.

1. Before starting construction

Please check that the contents of your kit are complete. You will find Figs. 01 + 02 and the Parts List helpful for this.

2. Preparing the control snakes

Check the length of the elevator snake tubes 43 and 45 and shorten them if necessary.

433 / 2 Ø x 275 mm

452 / 1 Ø x 300 mm

Steel 41 0.8 Ø x 355 mm

Repeat the procedure with the rudder snake tubes 44 and 46.

44	3 / 2 Ø x 225 mm
46	2 / 1 Ø x 275 mm
Steel 42	0.8 Ø x 325 mmplease insert!

3.Installing the snakes in the fuselage shells Caution: it is important to glue the snake outer sleeves 43 and 44 to the fuselage shells over their full length, as this increases the strength of the tail boom considerably. Check that the control snakes work smoothly, and be careful not to allow any glue to run inside the outer sleeves.

4.Left-hand fuselage shell:

Trim the shell using a balsa knife, as shown in Fig. 03.

Position the snake outer sleeve 43 in the front of the fuselage shell, as shown in Fig. 05. Lay the shell down flat, and glue the outer sleeve 43 to the external channel over its full length, using cyano.

Installing the servo

Set the servo to neutral (centre) from the transmitter, and fit the output arm on the output shaft at 90° to the servo case. Connect the pre-formed end of the steel elevator pushrod to the second hole from the inside of the servo

output lever. Slip the inner tube 45 over the steel pushrod, and slide both into the outer sleeve 43 from the servo end.

Fig. 05

Fit the servo in the left-hand fuselage shell from the side as shown. If you wish to use different servos, it may be necessary to make minor adjustments here. Tape the servo lead in the fuselage, so that it does not get in the way when gluing the fuselage shells together. Glue the servo to the fuselage with a drop of hot-melt glue at each mounting lug. Fig. 05

Glue together the wing bolt support components 33 / 34. If finger power is not sufficient, press them together using combination pliers, then glue the assembly in the fuselage shell.

Place the latch clip 22 for the Canopy-Lock canopy retainer in the fuselage in such a way that the latch lug 23 fits between the clip 22 and the fuselage side: spray activator in the recess in the fuselage and allow it to air-dry. Now apply cyano to the joint surfaces of the latch clip and position it immediately. Apply more glue to reinforce the joint if necessary. Fig. 07

5. Option

If you wish, you can fit a tailwheel to your model. This is actually necessary if you intend to fit floats at a later date, as a water rudder is absolutely essential for this version, and this uses the installed tailwheel wire. Figs. 09 - 13 show the procedure.

You will find a bending template in Figs. 12 + 12a. The steel wire should be 1.3 mm Ø. The tube required is the remainder of part 44. Cut the water rudder to shape from 3

mmDepron, and fix it inside the steel wire frame using adhesive tape. Cut a V-notch in both fuselage shells to accept the wire, as shown in Fig. 10, and pierce a hole in the tailplane for it; Fig. 11. If you fit the tailwheel, the integral foam tailskid on the fuselage should be cut off. Cut a slot in the rudder for the driver wire; Fig. 10.

6. Right-hand fuselage shell:

Trim the shell using a balsa knife, as shown in Fig. 04.

Position the snake outer sleeve 44 in the front of the fuselage shell, as shown in Fig. 06. Lay the shell down flat, and glue the outer sleeve 44 to the outer channel over its full length, using cyano.

Installing the servo

Set the servo to neutral (centre) from the transmitter, and fit the output arm on the output shaft at 90° to the servo case. Connect the pre-formed end of the steel rudder pushrod to the innermost hole of the servo output lever. Slip the inner tube 46 over the steel pushrod, and slide both into the outer sleeve 44 from the servo end. Fig. 06

Glue the canopy latch clip in place; Fig. 08

7. Joining the fuselage shells

Start with the right-hand fuselage shell 4. We recommend medium or thick cyano for this stage.

The fuselage shells 3 and 4 can now be glued together.

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