The nasal boss of the rubber-motor model. Drawing, description

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The nasal boss of the rubber-motor model. Tips for a modeler

Modeling

Athletes competing with rubber-motorized models are well aware of the importance of a clear, trouble-free operation of the nose boss locking device. Therefore, the appearance of any new design of it is of great interest to aircraft modellers.

Today we bring to the attention of our readers a boss designed by engineer V. Anikin from Rybinsk.

All design features of the boss are shown in the drawing, they can be easily "read" from it. Therefore, I will tell you about the procedure for working with the boss at the start.

First of all, we disconnect it from the plug (Fig. 1), into the hole A of which we insert the spring-loaded hook of the drill. We hook the end of the rubber motor onto roller 18. After its “winding”, we turn the drill with a hook by 90 ° and rest against the edge of the forward fuselage (Fig. 3). We insert the end of the boss shaft into the hole Ø 4,5 mm and the shaped grooves of the fork and fix it by turning it in the direction opposite to the rotation of the propeller. By pressing the hook button, we disconnect the drill. The nose boss (in the locked position of the propeller) is inserted into the fuselage.

Rice. 1. Nose boss of the rubber motor model (click to enlarge): 1 - spinner (D16T), 2 - threaded bushing, 3 - spring (OVS wire Ø 0,4), 4 - propeller blade, 5 - propeller (M3 - steel) , 6 - lock nut (M3), 7 - earring, 8 - axle (OVS wire O 2), 9 - rubber ring, 10 - hub, 11 - lever (D16T), 12 - pin (OVS wire Ø 1), 13 - screw (M2,5), 14 - fork (D16T), 15 - spring (OVS wire O 0,3), 16 - stopper, 17 - body (D16T), 18 - roller (D16T, ebonite), 19 - screw ( M2,5), 20 - fork, 21 - bandage (D16T), 22 - pin (OVS wire Ø 2), 23 - threaded bushing, 24 - shaft (OVS wire Ø 3), 25, 26 - bushings (D16T), 27 - ball bearing No. 23 (3x10x4), 28 - screw (M1,4), 29 - cover (D16T), 30 - flange, 31 - bushing (bronze), 32 - screw (M1,4), 33 - pin (wire OBC Ø 2), 34 - insert (D16T), 35 - pin (wire OBC Ø 0,8), 36 - fairing (D16T).

To start the rubber motor at the start during a long wait, it is necessary to press the lever 11 to the forward position (along arrow B) and turn the propeller at a certain angle, then release the lever. In this case, the spring-loaded stopper 16 will slide along the end face of the flange 30 until it enters the stopper hole. In this case, we twist the rubber motor by one turn. If you need to twist a few turns, the operation is repeated several times.

Nose boss of the rubber-motor model
Rice. 2. Winding up the rubber motor with the propeller removed: 1 - drill hook, 2 - drill hook button, 3 - forward fuselage

Nose boss of the rubber-motor model
Rice. 3. Connecting the nose boss after winding the rubber motor: 1 - fuselage nose, 2 - drill hook.

At the moment of launching the model, the hub 10 of the propeller, together with the spinner 1, moves forward (along the arrow B) by 2,5-3 mm, in this position the stopper 16 no longer works. The spring 3 is compressed and held so almost until the last revolutions of the rubber motor due to the friction forces arising from the torque that is transmitted from the roller 18 through the fork 20, pin 22, threaded bushings 23 and 2 (with a groove), shaft 24, pin 33, spinner 1 on the hub 10 of the propeller. When the torque drops to almost zero, the spring 3 returns the spinner 1 and the hub 10 to their original position and the tightened stopper 16 ensures that the propeller is smoothly locked in a strictly defined position. The length of springs 3 and 15 must be clarified when testing the operation of the nose boss, while the axial force of the first spring should be slightly greater (by 0,1 kg) than the axial force of the second spring. If necessary, their length can be shortened by grinding the ends on an emery wheel.

The propeller blades are folded under the action of the oncoming air flow and with the help of rings 9 made of round Hungarian rubber.

The propeller blades are made from balsa. A wedge-shaped linden insert is glued into the butt of their workpiece, into which, in turn, a pointed steel rod with an M3 thread is placed on epoxy resin (Fig. 4).

Nose boss of the rubber-motor model
Rice. 4. Butt of the propeller blade: 1 - propeller blade, 2 - basswood insert, 3 - steel rod with M3 thread, 4 - threads with glue.

All titanium parts of the nose boss can be successfully replaced with steel parts with the appropriate heat treatment. Weight of the finished structure (together with propeller blades) 39-42 g.

This boss with some modifications (they are reflected in the drawing) was operated for several years and proved to be trouble-free and reliable in operation.

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