Glider NK-24. Drawing, description

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Glider NK-24. Tips for a modeler

Modeling

The model is designed for participation in all-around competitions in the F-3-B class. Although the glider is designed for domestic RUM-2 equipment, foreign equipment can also be successfully used on it.

When creating the design, the following were taken into account: operation in any weather conditions, maximum aerodynamic quality, load changes, design reliability and transportability. The airframe wing is two-spar, the front (main) belt is designed to provide bending strength, and the rear - to increase the strength of the trailing edge at the location of the spoilers (air brakes) and flaps. To enhance torsional strength and maintain the profile, the front of the wing is sheathed in balsa 1,5 mm thick. The flaps are also made from it.

Interceptors of "sandwich" design: balsa - fiberglass - balsa. All adhesive joints on epoxy resin ED-16.

The flaps and spoilers are covered with thin long-staple paper, the wing is covered with veneer and covered with five layers of enamel and two layers of zaponlak.

Interceptors are used to correct the flight path during landing approach. Flaps before the start are released manually and fixed mechanically, they are removed during the uncoupling of the model (on command). This makes it easy to start when using ballast to perform the "speed" exercise.

The fuselage is fiberglass, made of three (in the front) and two (in the rear) layers of fiberglass 0,18 mm thick, glued together in a matrix with EPS-1 epoxy resin.

To increase rigidity, several plywood and balsa frames are glued into it. The ballast chamber is located near the center of gravity of the model.

The glider's keel is trussed, glued with veneer and attached to the fuselage with detachable loops. The stabilizer is of a classic design, covered with thin long-staple paper.

The weight of the model with RUM-2 equipment is 1790 g (with varioprop - 1760 g). To perform the "speed" exercise, a ballast weighing up to 480 g is placed in the chamber. To simplify and lighten the glider, flaps and spoilers can be abandoned.

The NK-24 model was operated for three seasons and showed good results: range - 1875 m, speed - 16,3 s.

Radio-controlled model of the glider NK-24 (click to enlarge)

Before flying the model, check the distance between the center of gravity and the angle of attack of the wing. In light wind (in the absence of updrafts), the glider should fly for 4-4,5 minutes without sudden changes in flight speed. At the first starts, it is not advisable to use flaps.

If the glider is flying steadily in normal mode, make it dive. The elevator deflection is selected so that the entry and exit from the dive is smooth. Then adjust the deflection of the rudder. At full rudder deflection, the glider should roll strongly and turn sharply without losing speed and controllability.

The angle of deflection of the flaps is selected when tightening on the rail. Note that their excessive deviation can lead to loss of speed and controllability.

Particular attention should be paid to the following elements of the flight: the start and the beginning of the flight in front of the base, the passage of the base A and B, turns (large radius with a minimum loss of altitude and a small radius with a minimum loss of speed), precision landing, search for thermal flows.

It is best to train with the same assistant, who is both an observer and a "judge".

Training flights should be carried out according to the rules of the competition, taking into account working hours.

Author: H.Kyrvel

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