Two tasks of electric piloting. Drawing, description

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Two tasks of electric piloting. Tips for a modeller

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To cool the microelectric motor that rotates the propeller on flying model aircraft, a small impeller is usually installed immediately in front of the anchor. It pushes air through the motor housing. The front part of the winding and the armature set is blown most intensively.

Forced cooling is indispensable - a highly loaded engine operates "on overheating". However, the intensity of cooling can be significantly increased by moving the impeller behind the armature. And if, at the same time, the fan disk is also cut into a number of sectors corresponding to the number of collector plates, and the “petals” are soldered directly onto the lamellas, then heat can also be removed from the most thermally loaded parts. To increase the heat transfer of the "rotating radiator", cut its elements out of copper or brass foil 0,15-0,2 mm thick.

Propellers of electric models are still far from perfection. But it is precisely on how well this part will be made and how accurately this part is selected that the main characteristics of the microaircraft largely depend on.

A propeller for an electric aircraft model and an improved design of the motor armature (click to enlarge): 1 - blade, 2 - spinner hub, 3 - tubular plastic insert, 4 - classic fan impeller installed at the cooling air inlet, 5 - motor armature, 6 - sector element of the new impeller-heat sink (soldered on the lamellas of the collector plates), 7 - collector assembly.

To a large extent, such properties of the propeller as strength and minimum weight are important. All requirements are met by a propeller with blades, the patterns of which are cut out of aluminum foil 0,15 mm thick. By giving the butt sections a tubular section, you will get excellent propeller elements. At the ends, the blades will have the most advantageous curved profile, with a bend increasing towards the butt. The transition on the butt itself into a circular section does not reduce the efficiency of the propulsor, since it falls on zones that practically do not participate in creating thrust.

The spinner hub for such a propeller is easiest to cut out of lightweight packaging foam. Outside, the workpiece is covered with a thin layer of epoxy putty and sanded. According to the markup, holes are pressed in the coca, and finished blades are glued into them. A polyvinyl chloride tube is fixed along the axis with glue, which makes it possible to ensure a tight fit of the screw on the motor shaft. An invaluable advantage of such a propeller is the ability to select the pitch of the propeller by bending its blades. The mass of the finished unit is 2-2,5 g.

Author: Yu.Zdanovich

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