Flight, May 1932
The Farman 250
A New Passenger Transport and Postal 'Plane
THE Farman Air Lines will shortly put in operation a new low-wing single-engined monoplane designed by Henry Farman for fast passenger and postal service. This plane, which is
known as the 250, carries a pay load of some 560 kg. (1,235 lb.). It has accommodation for four passengers and there are compartments fore and aft for express matter or baggage.
Equipped with a Gnome and Rhone 380-h.p. "Jupiter" 9-cylinder air-cooled engine this machine has shown a ground speed of 250 k.p.h. (155 m.p.h.), with a cruising speed of 220 k.p.h. (136.7 m.p.h.). It was recently sent to Le Bourget to complete its 100-hr. service test, as required by the French authorities, before being allowed to carry passengers.
The plane is of wooden construction throughout. The wings, which are of the semi-thick type, have the customary Farman rectangular shape, with a comparatively large chord tapering slightly toward the tips. They consist of centre sections which form an integral part of the fuselage and to which the main wings are joined in cantilever fashion. The oleo-pneumatic shock absorbers of the landing gear are also joined to the underside of these centre sections and are further braced by a slanting strut running from the axles of each of the wheels to the bottom of the fuselage. The longerons and internal bracing of the wings are of wood while the wings themselves are covered with plywood. The ailerons are non-compensated. The fuselage and the empennage are of the same type of construction as the wings, and are covered with plywood.
The fuel tanks are installed in the two centre sections of the wings next to the fuselage and have a capacity of 270 litres each (60 gall). An auxiliary fuel tank, of 90 litres (20 gall.) capacity, is mounted in the fuselage, thus making a total fuel capacity 630 litres (140 gall.), which serves to give the plane a flight radius of somewhat over 6 hr. or about 1,300 km. (808 miles) at cruising speed.
The fuselage has the typical Farman fiat sides and top giving a maximum amount of interior space. The cabin is lighted by six ports, three on each side. It has accommodation for four people, a broad upholstered bench suitable for two persons being installed in the forward part of the cabin and two arm chairs, which can be moved backward or forward, complete the seating equipment. The cabin can be heated by the exhaust gases from the motor and a special ventilator installed in the roof cools the air in warm weather. Two compartments for carrying baggage or postal matter have been installed, one in the forward part of the fuselage just aft of the engine, and the other compartment aft of the cabin. The pilot's seat is placed on top of the fuselage just behind the cabin, from which excellent visibility is obtained.
The landing gear is of the split-axle type, fitted with oleo-pneumatic shock absorbers. It has a track of 3 metres (9 ft. 9 in.).
It is reported that this plane will be placed in operation on one of the long-distance routes of the Farman Lines, which extend from Paris to Brussels, Amsterdam and Berlin, as well as to Malmoe and Copenhagen in the Scandinavian countries.