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Kellner-Béchereau E.1
In the 1930s, Louis Béchereau set up Avions Kellner-Béchereau, a collaboration with the well known automobile coach builders Kellner. In 1936-7 they built a short series of small monoplanes exploiting one of Béchereau's patents, a full span lateral division of the wing into two sections forming a "double wing" a little like that used by Junkers but with a more equal division of area. The Kellner-Béchereau E.1 was the first of these.
The Kellner-Béchereau E.1 was an experimental single engine, single seat light aircraft. It was a monoplane with a novel "double" wing, the rear part providing lift and lateral control as well as acting as slotted flaps.
The E.1 was a wooden aircraft with spruce frames and plywood covering. It was a mid-wing cantilever monoplane with straight, thick section, constant chord wings of quite high aspect ratio (8.45). The lateral division was at about 65% chord, with the rear part joined to the front with conspicuous V-shaped faired underwing hinges. In normal flight the two parts were close together and the rear sections acted both as lifting surface and, differentially, ailerons but they could also be lowered together as slotted flaps, moving rearwards as well as down to produce a slot between fore and aft parts. The fuselage was rectangular in cross section, with a single place open cockpit at the wing trailing edge, baggage space behind and an inverted in-line 30 kW (40 hp) Train 4T in the nose. A straight edged tailplane was mounted on the upper fuselage longerons and carried elevators with a small cut-out for rudder movement. The latter, mounted on a very narrow fin, was rectangular and extended to the bottom of the fuselage. The rear control surfaces were fabric covered. The E.1 had a conventional undercarriage with cantilever main legs hinged on the lower longerons, rubber sprung inside the fuselage.



The aircraft first flew in November 1934 and after flight tests in 1936, the E.1 was developed into a pair of larger and more powerful side by side seat basic trainers, the wooden Kellner-Béchereau EC.4 and the metal Kellner-Béchereau ED.5, flown in 1937.
Engine: 1 × Train 4T, 30 kW (40 hp)
Propeller: 2-bladed
Wingspan: 6.50 m (21 ft 4 in)
Wing area: 5.0 sq.m (54 sq ft)
Length: 4.42 m (14 ft 6 in)
Height: 1.98 m (6 ft 6 in)
Empty weight: 172 kg (379 lb)
Gross weight: 276 kg (608 lb)
Maximum speed: 160 km/h (99 mph, 86 kn)
Cruising speed: 145 km / h
Stall speed: 58 km/h (36 mph, 31 kn)
Endurance: 3 hr
Practical range: 500 km
Rate of climb: 2.0 m/s (390 ft/min)
Service ceiling: 6,000 m (20,000 ft)
Seats: 1

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