Avia Ba 122 (oz14291)

About this Plan

Avia Ba 122. Radio control scale model biplane. Wingspan 1420 mm.

Quote (google-translated from the German): "Detailed information on the Avia biplanes and also on the prototype of this model can be read in the scale documentation that will appear in the coming issue [see article pages]. At this point we now provide detailed information about the construction of the model, the 'RC-Avia'.

The biplane, like its prototype, is very manoeuvrable and reacts quite sensitively to rudders, which is also desirable for an aerobatic aircraft. In terms of flying, this construction is demanding, but it is also on the workbench. Not a model for beginners, but for an experienced model builder and model pilot, it is a semi-scale model that inspires with its faithfulness to the original and flight image, but in contrast to many other 'original ones' it also has a lot to offer in terms of flying.

Anyone who has enough construction but only moderate flying experience should first take a comparably designed but simpler biplane for practice. Perhaps you can find a used one at a reasonable price on a model building exchange.

This forewarning should not discourage anyone interested in the Avia or advise them against building it. This scale biplane, however, requires calm and safety when steering. If you bring both with you, you will also have a lot of fun flying the model.

Before construction, we have to study the construction plan carefully with regard to the intended motor and RC internals. The 10cc two-stroke engine used in the prototype can very advantageously be replaced by a comparably large, good, modern four-stroke engine. The fact that this is a bit heavier should prove beneficial when balancing the center of gravity. (The possibility of installing a real model radial engine is not discussed further, since this would probably be too big and heavy and the price would be prohibitive for most anyway.)

In any case, we have to build very lightly in the rear fuselage area and on the tail unit in order to get by with as little lead ballast as possible. The less the biplane weighs, the better and more realistic its flight characteristics. The center of gravity has to be right, it has to be a little further forward. With an SP reserve, the model will hardly be controllable.

Construction of the fuselage: The starting point is a square box made of 2 mm balsa (parts T28, T29, T35) and the corresponding frames. The whole thing is built on the back. Make sure that frames T3 and T4 are perpendicular to the longitudinal axis of the fuselage.

After the adhesive has hardened, frames T12 to T20 are mounted. First, the area between T15 and T17 is covered with 2 mm balsa, the upper curve is covered with 3 x 6 mm balsa strips. The area between frames T15 and T17 is covered with round 2.5 mm strips that indicate the tubular steel construction. Likewise, the tube frame is represented by such round strips on the fuselage sides and the fuselage floor. Then the spur T21 is glued in. The frame T1 is resined in with epoxy, the rear of the fuselage is closed with the vertical stabilizer spar T8..."

Supplementary file notes

Article.

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