| Hanriot H.25 | |
|---|---|
 | |
| Role | Six passenger airliner |
| National origin | France |
| Manufacturer | Aéroplanes Hanriot et Cie |
| First flight | Early 1926 |
| Number built | 1 |
The Hanriot H.25 was a French, single-engined, six passenger airliner built in 1926. Only one was flown.
The Hanriot H.25 was a braced, high wing monoplane. It had an all-metal structure, covered everywhere with fabric. Its wing was built in three parts, a central section fixed to the upper fuselage longerons and a pair of outer panels which were braced on each side by two sets of parallel paired, interconnected struts which ran from two well-separated positions on the wing spars to meet on the undercarriage structure. The wing was essentially rectangular in plan apart from slightly angled tops and had constant thickness. Narrow-chord ailerons filled well over half the trailing edge. [1]
It was powered by a 370 kW (500 hp), eighteen cylinder Salmson 18 Cm. This was one of the last, and the most powerful, of Salmson's water-cooled radial engines, with two in-line rows of nine cylinders. It was enclosed in a rounded cowling with caps over the cylinder-heads. Fuel was held in the wing centre-section and two Lamblin radiators were mounted on the undercarriage legs. Behind the engine the fuselage was rectangular in section, defined by light-metal, U-section longerons and cross-frames. The open cockpit was at the wing leading edge, with small side-windows for a better view downwards. Behind the cockpit the cabin seated six passengers, each with their own window. Entry was via a port-side door and there was a disposable emergency ceiling hatch to allow passengers to escape by parachute. [1]
The horizontal tail was mounted on top of the fuselage, braced from the lower fuselage longerons on each side with a pair of parallel struts. Its plan was similar to the wing and the elevators were split, with a cut-out for the deep, broad rudder. The tailplane angle of incidence could be trimmed in flight. The low area fin was broad but unusually low; its angle of incidence could only be adjusted on the ground. The H.28 had conventional, fixed, tailskid landing gear. Its mainwheels, half enclosed by individual semi-circular fairings, were on a single axle and rubber cord shock absorbers enclosed within a streamlined fairing mounted on the lower fuselage longerons by N-form struts and reinforced by the wing bracing struts. The undercarriage track was 3 m (9 ft 10 in). [1]
The date of the H.28's first flight is not known but by mid-May 1926 its development programme was underway at Villacoublay. [1] No more independent reports on the type appear in the French journals and there is no evidence of a second example.
Data from Les Ailes, May 1926 [1]
General characteristics
Performance
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