Rubber-engine aircraft model. Drawing, description

MODELING
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Rubber-engine aircraft model. Tips for a modeler

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Model №1

This design is a continuation of the work on improving the model, which was described in "M-K" (No. 1, 1972). For better streamlining, a round fuselage is used on it. The keel has a swivel mechanism for forced descent. The propeller diameter has been increased to 556 mm, which contributes to the duration of the motor flight and improves the dynamic characteristics of the launch.

To make the model more stable, the wing sweep has been increased to 25°. Its profile and endings are convex-concave.

(click to enlarge)

Model No. 1 technical data:

S of the bearing part of the wing - 14,9 dm2
S stabilizing blades - 3,4 dm2
Model weight 235 g.

The main structure is made of balsa. Linden screw. The model features a rapid takeoff and rapid climb. The disadvantage is the relatively high planning speed, which, unfortunately, was often the reason for the model to exit the upstream.

Model №2

This is a further development of the scheme with a straight central part and tips bent back. In terms of fuselage design, keel attachment, propeller parameters, forced descent principle, this model repeats the previous one. But she has a different flight character due to the installation of a straight wing, which contributes to a decrease in speed both in motor mode and in gliding. This has its pros and cons.

The launch of the model should be smoother, the motor flight is not as fast due to the tendency of the structure to roll over on its back. But with careful adjustment, it was possible in calm weather (wind 3-4 m / s without thermal flows) to show a result of more than 2 minutes.

(click to enlarge)

Technical data of model No. 2:

S bearing parts of the wing - 13,6 dm2
S stabilizing parts - 5,2 dm2
Model weight - 288 g.

As a result, it should be said that the improvement of details, the improvement of the propeller group, the change in sweep contributed to the improvement of the flight characteristics of the model. But, unfortunately, all this did not lead to a sharp increase in the duration of the model's stay in the air due to mediocre planning.

In this regard, it is advisable to search for the most advantageous profile of ribs and elongation. Work should also be done on the twisted wing to reduce the area of the stabilizing rudders. The high quality of flight of models with such a wing was demonstrated by aircraft modelers from Serpukhov, headed by an experienced teacher E. Deligentov. True, they did not gain much height, but good planning compensated for this shortcoming, the Models were easily kept in the updrafts.

Author: B.Bashtannik

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