Bolkow Junior (oz14763)

About this Plan

Bolkow Junior. Radio control scale model, for electric power with geared Speed 400 motor.

Direct submission to Outerzone.

Planfile includes full build instructions in German, English and French.

Quote: "Safety notes: Please be sure to read and observe the safety notes included in the kit. If you ever dispose of the model be sure to pass on the safety notes and the quick-build plan to the new owner.

Introduction: The BOELKOW JUNIOR is a small semi-scale electric-powered model aircraft, and is ideal for a geared SPEED 400 motor and a SANYO 8N-500 AR flight pack. This relatively light electric power system gives this RC model an amazingly realistic appearance in flight. The model is highly pre-fabricated, but nevertheless it is important that you carry out the remaining work with the greatest care to ensure that the model flies successfully and safely.

Electric power system and accessories:
Geared motor: SPEED 400 6V FG 1.85
Propeller: SUPER NYLON 19 x 12 cm
Propeller adaptor: M6
Flight battery: SANYO 8N-500 AR 9.6 V/0.5 Ah
Speed controller: PICO MOS 35

We strongly recommend that you obtain all the extra items required to complete the model before you start construction, so that the parts can be fitted at the appropriate stage.

Radio control system To control this model you will need an FM radio control system with at least 3 channels, such as the FM 314 RC set with two micro-servos, e.g. C 241. Please refer to the main FS catalogue for more information on RC systems and accessories. The operating instructions supplied with your radio control system are also a useful source of data.

Notes on assembling the model: Use cyano-acrylate glue ("cyano"), Order No. 5823, for all joints in this model unless stated otherwise. Before gluing any parts to the model check that they fit, trim where necessary and drill holes at the marked points. Leave plenty of time for glue to set. Joints must be completely hard before you continue with construction.

Building instructions
1. Trim the motor cowl (2) and canopy (3) along the marked lines in the vacuum moulded parts, referring to the plan if you are not sure.
2. Assemble the noseleg unit as shown in the .exploded drawing on the plan. Tighten the grubscrew (9) well. The self-locking nut (12) should be tightened just to the point where the pushrod connector (11) still rotates freely.
3. Carefully bend the bowden cable outer (14) to follow the curve shown on the plan and glue it in place.
4. Glue the servo support plate (17) in place; the exact location is determined by the position of the servos you intend to use.
5. Screw the rudder and elevator servos to the servo plate.
6. Bend the rear end of the pushrod stiffener (16) as shown and connect it to the servo output arm.
7. Slip the completed inner pushrod into the outer from the rear.
8. Fix the noseleg unit in place with the screws (6) and slip the pushrod inner (15/16) through the pushrod connector (11). Tighten the grubscrew (13) to secure the pushrod.

9. Attach the main undercarriage (18) to the fuselage using the straps (19) and retaining screws (4).
10. Check that the tail panels (20) to (22) fit in the slots in the fuselage and align them carefully. An easy way to do this is to lay a ruler on the wing saddle. You can then sight along the fuselage from the nose and check that the tailplane is parallel to the ruler. Check from above that the parts are square to the fuselage centreline. The parts can either be glued to the fuselage now, or after they have been covered.
11. Cut down the horns (25) as shown. Drill 3 mm 0 holes in the positions shown and push the horns into the holes 'dry' (no glue). They are glued in place permanently after the decals have been applied.
12. Make up the rudder and elevator pushrods from parts (26) to (30) as shown on the plan. You may find it necessary to adjust the shape of the rudder pushrod (30) in particular to ensure that the system works smoothly, without binding at any point.
13. Cut a slot in the root rib of both wing panels (32) and (33) to accept the wing joiner (35).
14. Pin or weight down the wing centre section (34) on a flat surface and glue both outer panels to it together with the wing joiner (35), again referring to the plan.
15. Sand the leading edge fairing (36) to the shape shown, trim it to fit and glue it in place.
16. Glue the dowel (37) in the centre section (34) in the position shown on the plan..."

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