Evolutif 4 (oz14468)

About this Plan

Evolutif 4. Control line speed model. Wingspan 605 mm, for Rossi 15 engine.

Quote (google translated from the French): "FAI Speed Model. In conclusion to this series of articles, here is the plan of my latest model. It is a very stable device, at least the one made. Its main technical characteristics are as follows:

Wingspan: 605mm.
Wing area: 3.6 dm2 S1
Tail surface: 2 dm2 S2
S2/S1 ratio = 55%
Lever arm: 140mm.
Front lever arm: 90 mm.
Engine :
Rossi 15. Series 75.
Supply: Low crankcase pressure.
Centrifugal regulation by Miebach system.
Weight: 445 grams empty tank.

Performance: This model won the 2 federal competitions in which it participated: Villefranche to Mâcon on September 15, 1974 with 239 km / h and cables prepared. Villefranche to Mâcon on April 6, 1975 with 222 km/h and 40/100 cables. Normals.

For the construction of this model, the reader will refer to the articles already published in the MRA numbers 414 to 416, 418 to 420, 425 and 426.

In summary, we will start with the making of the wooden model intended for the manufacture of the fiberglass fuselage (F). Simultaneously, the wing spar will be refined using a beautiful 15 X 5 spruce rod (L on the plan).

We then practice in the fuselage the 2 buttonholes useful for the passage of the spar, which will then be inserted and glued there - the rudder bar (P) will be installed.

We then move on to the construction of the empennage in two layers of 20/10th semi-hard balsa glued together, the leading edge will be reinforced by a 4 X 4 spruce strip (Ba), we also bring back the 2 marginal edges (Bme and Bmi) in linden. The empennage will then be profiled, except for its central part.

We practice in the fuselage, the necessary indentation and we stick this empennage there after having put it at dihedral. The junction with the fuselage will be reinforced on both sides by a strip of glass fabric, glued with Araldite.

The basic crutch of the fuselage is then made up of thin strips of 6/10th plywood. After drying, the joint plane will be sanded very 'flat' on a marble-like quality surface. The previously sanded metal shell will then be presented and its centering sheaths and dowelling glued. We will also report the cooling channel in rolled 6/10th plywood, and the fixing of the resonator at the back (dural 1 mm). The torsion rigidity of the fuselage will be ensured by the Cd and Cb couples in 40/10e balsa. We finish by making the openings for the needle, the front cooling and the passage of the cylinder head and the regulator adjustment screw..."

Direct submission to Outerzone.

Supplementary file notes

Article.

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