Английская Википедия:Gaucher RG.40 Week-End

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The Gaucher RG.40 Week-End was a high-wing, two-seat, low-power, touring aircraft built in France in 1935. Three were built and later SECAT produced several rather similar designs, all from designer Rémy Gaucher.

Design

The RG.40, first announced in April 1935, was an attempt to produce an economical light aircraft seating two side-by-side. It and its several descendants had engines in the Шаблон:Convert power range. It was the first aircraft designed by the new Les avions légers économiques R.Gaucher, though it was built at Ponthierry in Berthier's factory.

Its high, cantilever wing was approximately elliptical in plan, though with a rectangular Шаблон:Convert span central panel. The central section had constant thickness but the outer panels thinned from below to provide a little dihedral. It had wooden spars and ribs and was plywood skinned. Ailerons filled two-thirds of the span and there was a central, rectangular transparency to provide the pilot with an upward field of view.

It was planned to power the RG.40 with a Шаблон:Convert AVA 4A-02, an air-cooled, flat four, two stroke engine, mounted in the nose with cylinder-heads projecting for cooling, but the earliest flights were made with a smaller bore version, the Шаблон:Convert AVA 4A-00. The Week-End's rectangular cross-section fuselage had a wooden structure and was ply covered. The forward view from the cabin was through a long, one-piece transparency and the only sideways obstructions were the two pairs of vertical members that joined fuselage and wing. Cabin entry was via two large doors.

The empennage of the RG.40 was conventional, with a triangular tailplane mounted at mid-fuselage carrying well separated elevators. The vertical surface was triangular overall, with a small fin but a generous and pointed balanced rudder.

The Week-End had conventional, fixed landing gear with each mainwheel mounted on a stub axle provided with a torsional shock absorber. Each axle was at the convergence of three struts from the lower fuselage. There was a small tailskid.

Development

The exact date of the Week-End's first flight is not known but it was undergoing early flight trials at the start of July 1935. At that time it was powered by the smaller, Шаблон:Convert AVA. Two had been built by early July and later that month, when the first Week-End's tests had proved very successful, a third example was under construction. This was to be powered by a Train 4T four cylinder, air-cooled, inverted in-line engine producing Шаблон:Convert. It was designated the Gaucher RG.40T.

The date of the first flight of the Gaucher 40T is again unknown but it was flying by April 1936. It was at Villacoublay for its official tests in mid-June 1936.

André Gérard built a development of the RG.40, called the Gérard RG.45, Gérard-Gaucher 45 or Gérard Club-45, which flew for the first time on 20 October 1938.Шаблон:R. Powered by a Шаблон:Convert Zlin Persy II flat-four engine,Шаблон:R its span was increased to Шаблон:Convert, wing area to Шаблон:Convert and empty weight to Шаблон:Convert.

In 1938 Gaucher joined newly founded SECAT (Société d'Etudes et de Construction d'Avions de Tourisme) in Boulogne and designed a series of light aircraft very similar to the Week-End apart from their engines. The SECAT VI La Mouette, powered by a Шаблон:Convert Train 6T inverted six cylinder in-line engine, flew before World War II and was produced in a series of five, one of which survived the war as the SECAT S.4 La Mouette. The SECAT S.5 and SECAT RG.75 were post-war developments, powered by Régnier Шаблон:Convert 4D2 four cylinder, inverted in-line engines.Шаблон:R

Operational history

In 1936 the RG.40T competed in the two litre category of the annual Angers competition, in which the winner flew the furthest in a fixed time. Originally a 24-hour event, that of 1936 only lasted 6 hours because of increasing average speeds. Flown by Burrelli, the Gaucher was the slowest finisher, averaging Шаблон:Convert.

Variants

Gaucher RG.40 Week-End

2 built, first flown 1935.

Gaucher RG.40T

As RG.40 but with Шаблон:Convert Train 4T engine, first flown 1936.

Gérard RG.45 Club

The RG.40 with Шаблон:Convert Persy II engine, first flown 1938.