Rubber helicopter. Drawing, description

MODELING
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Rubber helicopter. Tips for a modeler

Modeling

The model that we suggest you make is made according to a rare scheme - its two rotors intersect during rotation. It is not very difficult to build it - especially since rubber bands, well known to modellers, serve as its engine. The energy stored in them during spinning is quite enough to fly a small model of this type. The diameters of the rotors are 600 mm each, each of them has its own shaft, and both rotate in opposite directions, which provides a synchronizing mechanism. Its four gears are cut from metal gears with a suitable outside diameter, which can be picked up from the parts of an old alarm clock or a broken clockwork toy. After processing, the thickness of each gear should be about 2mm, the diameter of the inner hole should be 2mm.

The housing, in which the rotor shafts and the synchronizing mechanism are mounted, is sawn and bent from sheet duralumin 0,5 mm thick. Rotor shafts - made of steel wire Ø 2 mm; they can also be made from a knitting needle of suitable thickness. The gears are fastened to the shafts with steel pins Ø 0,8 mm, the holes for them are first drilled in the gears, and directly in the assembly process in the rotor shafts.

The rotor bushings are aluminum. The blades are cut from balsa plates 2 mm thick and fixed to the hub with glue. After gluing, the rotors must be balanced.

The fuselage and tail boom are cut out of foam - preferably from packaging. Landing gear and skids - made of duralumin 0,5 mm thick; they are glued to the fuselage with epoxy resin. The vertical shaft for rubber bands (each of which contains 16 round threads) should be reinforced with a thick paper tube.

Rice. 1. Two-rotor rubber-engine helicopter (click to enlarge): 1 - fuselage (foam), 2 - landing gear, 3 - balance rod with a weight, 4 - synchronizing mechanism, 5 - rotors, 6 - tail unit

When assembling the model, please note: a clear coordination of the position of the rotors is required. If the blades of the left rotor are parallel to the line of flight, then the blades of the right should be perpendicular to it. The blades of both rotors are set at the same angle, otherwise the flight will not be straight. If it nevertheless turns, for example, to the left, then this means that the angle of installation of the blades of the right rotor is greater than that of the left. As a result, the lifting force of the right rotor becomes greater than that of the left one, which entails a turn of the model.

To adjust the flight, a thin balancing rod is installed in the forward fuselage. By moving a copper or steel weight, you can make the helicopter fly forward, hover in place, or even move backwards.

rubber-engine helicopter
Rice. 2. The sequence of manufacturing the gears of the synchronizing mechanism: A - drilling holes in the gear Ø 0,8 mm for the pins; B - gear cutting; B - finished gears

Rice. 3. Manufacture of the synchronizing mechanism (click to enlarge): A - body scan (the figure shows a schematic scan, in accordance with the available gears, its dimensions should be specified in place and, having previously made a template from thick paper, transfer its dimensions to a duralumin plate with a thickness of 0,5 .XNUMX mm); B - one of the stages of manufacturing the case (note that the holes for the axles of the synchronizing gears are cut together); B - to ensure the accuracy of the location of the shafts, it is convenient to use the plaza drawn on thick paper

When sending the model for the first flight, first spin the rotors 10-15 revolutions. The helicopter should fly with a slight lean to the left. When increasing the degree of twist of the rubber motor, do not forget to move the balancing weight forward. The recommended degree of twist is approximately 100 turns.

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