Radio-controlled aerobatic model. Drawing, description

MODELING
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Radio-controlled aerobatic model. Tips for a modeller

Modeling

For eight years now I have been working as the head of an aircraft modeling club at the station of young technicians in the city of Kiselevsk, Kemerovo Region. In my free time, I build radio-controlled models of S3A class aircraft. I want to bring to the attention of my fellow aircraft modellers a training flight model.

The model developed by me is intended for a beginner "aerobatic pilot" - it is easy to control, perfectly performs most of the aerobatics: Nesterov's loops, barrel rolls and others. It is possible to launch it, despite a rather large wing load - 70 gf / dm2, even from the hands. High aerodynamic qualities allow the model to glide with the engine off.

The equipment "Novoprop-3" is installed on the model. Its left channel is involved in the elevator, the middle one - in the rudder, and the right one - in the ailerons. When using "Supronar" it becomes possible to control the speed of the propeller.

radio controlled aerobatic model

Model Specifications:

Wingspan, mm - 1420
Model length, mm - 1122
Wing area, dm2 - 33
Stabilizer area, dm2 - 8
Wing profile - NACA 2415
Relative profile thickness, % -15
Angle of transverse "V", deg. - 6
Wing loading, g/dm2 - 70
Flight weight of the model, g - 2340
Centering, % SAH - 28
Mounting angles, degrees: wings - 1,5-2
stabilizer - 0
Engine - "Rainbow-7"
Deviation of rudders, degrees: height - ±15
directions - ±25
aileron - ±20
Fuel tank volume, ml - 170

The model is quite simple and designed with minimal use of balsa - the plumage and fuselage skin up to the middle of the wing are made of it. All other elements of the model are made of the most common materials - linden, pine, cedar and aircraft plywood. It is assembled with epoxy glue.

FUSELAGE - from two symmetrical trusses-sidewalls. Each of them is assembled separately from rails with a section of 5X4 mm. The transverse set of the fuselage - 4 frames, sawn from plywood 3 mm thick. Between the first and second frames is a fuel tank. Through the same frames, two beech bars of the motor mount are passed.

Rice. 1. Model design (click to enlarge): 1 - propeller Ø 275X135 mm, 2 - fuel tank, 3 - lantern (fiberglass), 4 - antenna, 5 - fuselage, 6 - keel, 7 - rudder (balsa), 8 - "crutch" (wire), 9 - elevator (balsa), 10 - stabilizer, 11, 13 - wing attachment pins (beech), 12 - strut and wheel of the main landing gear, 14 - strut and wheel of the front landing gear, 15 - motor mount (beech), 16 - rib (balsa), 17 - semi-rib (polystyrene), 18 - wingtip (polystyrene).

radio controlled aerobatic model
Rice. 2. Docking halves of the wing spar using plywood pads

The third, lightweight, frame is installed in front of the wing. A similar frame is placed behind the wing.

The assembled fuselage sidewalls are joined first with the first and second, and then with the third and fourth frames. Between them, additional transverse struts and braces are placed above and below.

After assembling the truss, a semicircular foam plastic fairing is glued in its upper part. The front part of the fuselage (up to the middle of the wing) is sheathed with plywood 1 mm thick, and the rear part - with balsa veneer 1,5 mm thick.

Removable engine HOOD; it is glued from fiberglass and fastened with two screws to the bars of the motor mount.

STABILIZER. Its front and rear edges are formed by balsa slats with a section of 5x10 mm. Ribs are glued between them (balsa slats with a section of 5X6 mm). The frame obtained in this way is sheathed with 1,5 mm thick balsa veneer.

KEEL. Structurally, it is made exactly the same as the stabilizer. The rudders and elevators are carved from 5 mm thick lightweight balsa.

The WING is single-spar. The spar is sawn from lime plates 3 mm thick and consists of two halves joined "on a mustache"; the junction is reinforced with 1,5 mm thick plywood overlays. The lengths of the pads match the distance between the landing gear legs. The ribs are cut from lime veneer 1 mm thick and lightened with holes. Each of the ribs is reinforced with shelves - strips of cedar veneer 0,5 mm thick. In the intervals between the ribs, polystyrene half-ribs 10 mm thick are glued. The leading edge of the wing is a pine rail with a section of 3,5x8 mm. The trailing edge of the wing is made of solid balsa with a section of 8x8 mm, reinforced above and below with lime veneer plates 0,5 mm thick and 5 mm wide.

radio controlled aerobatic model
Rice. 3. PVC steering knuckle and epoxy fixing

radio controlled aerobatic model
Fig 4. Installation of the steering machine

The caisson of the wing and the center section are sewn up with cedar veneer 0,5 mm thick. The wingtips are foam.

In the center of the wing there is a well of two-millimeter balsa plates - it houses the steering machine. Foam rubber pads greatly reduce the effect of vibrations on it and allow it to be inserted tightly into the socket.

The wing is pasted over with nylon, the fuselage - with mica paper. The wing is attached to the fuselage with rubber rings for beech pins Ø 0 mm mounted on the fuselage.

CABIN LIGHT made of fiberglass and painted blue. Landing gear - made of spring wire Ø 3,5 mm. The wheel hubs are machined from textolite, and the tires are cut from microporous rubber.

FUEL TANK polyethylene, its Ø 53 mm. The intake tube is rubber, at its end there is a weight of 4 g.

The ENGINE of the model is "Rainbow-7e". To reduce vibrations during its operation, the crankshaft was additionally balanced, and the piston was lightened by 2,5 g. An air screw Ø 275 mm and a pitch of 135 mm is installed on the model.

The model is painted with nitro enamels and covered with anti-methanol (parquet) varnish.

Author: V.Egorov

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