Laser 200S (oz14569)

About this Plan

Laser 200S. Radio control scale model. Wingspan 2490 mm, for 3W120 engine.

Quote (google translated from the Portugese): "Introduction: The project presented, on three drawing sheets in a special format (3m X 0.90m), in scale (1:1), is based on the engine fairing, the cabin and some constructive methods of models existing on the market.

It is an advanced model of complex construction not recommended for beginners, which is why the description presented below is merely a documentation of ideas and solutions, constructions, developed throughout the project without any other intention.

The model under the proposed conditions is an excellent flyer, docile and agile, being structurally compatible with the most radical maneuvers, having extra power, with the proposed engine, for vertical flight at (90º), without any difficulty.

The structure is dimensioned for gasoline engines from (100cc) to (160cc), twin cylinder with weight maximum (4,200g), including muffle weight.

The total weight of the model is around (14,000g), for a wing load of (130g/dm2), with the control surfaces with large areas to allow firm control even at close to stall speed.

The wing area of (105dm2), and the low wing loading (130g/dm2), associated with veining NACA0018 at the root and NACA0019 at the wingtips, configures in a type of arrangement adopted, to allow low approach and landing speed (30 to 40Km/h without any breeze) with stall speed around 15 to 20Km/h, theoretically, without any tendency, due to the great moment of the fuselage's tail and the proposed rib arrangement.

The stabilizer and the vertical rudder are built on rods, with the fixed parts plated in balsa from 1/16.

The servo fixing system allows visual inspection of linkages and connections, since 30% of servants are exposed. In the fuselage, there is a plywood cradle of # 6.00mm, glued externally the sides, which supports the VERTICAL RUDDER servos (2 servos) and the STABILIZER (2 servos).

For the AILERONS, only one servant was considered for each one, and they must have a minimum actuation force of 140g/in. The landing gear consists of two high-resistance T6 aluminum blades, with # 4.00mm at # 6.00mm thick each, cut and folded to the shapes detailed on sheet 3 of 3 of the set of drawings presented.

The fork is home-built and has been extensively tested on other similar weight models, showing itself to be highly resistant to fatigue and allowing easy maneuverability even in rough or grassy terrain.

The same principles used here have already been applied to a Laser 200 model, which was the prototype of this project, using a 98cc single-cylinder QUADRA ARROW engine and a model EXTRA 300 medium wing of similar dimensions and weight, equipped with a single-cylinder 90cc.

In both cases, the principles used here proved to be highly efficient, due to the docility and maneuverability of the models and the low approach and stall speed, without any trend..."

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