Hanriot H.25

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Hanriot H.25
Hanriot H.25 Les Ailes May 20, 1926.jpg
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.

Design and development[edit]

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.


Hanriot H.25 3-view drawing from Les Ailes May 26, 1926

Data from Les Ailes, May 1926[1]

General characteristics

  • Crew: one
  • Capacity: six passengers
  • Length: 12.50 m (41 ft 0 in)
  • Wingspan: 17.0 m (55 ft 9 in)
  • Height: 3.80 m (12 ft 6 in)
  • Wing area: 51 m2 (550 sq ft)
  • Empty weight: 1,700 kg (3,748 lb)
  • Gross weight: 2,600 kg (5,732 lb)
  • Fuel capacity: Fuel and oil 300 kg (660 lb)
  • Powerplant: 1 × Salmson 18 Cm water-cooled, two row inline radial, 370 kW (500 hp)
  • Propellers: 2-bladed


  • Maximum speed: 195 km/h (121 mph; 105 kn) at ground level
  • Service ceiling: 4,000 m (13,000 ft)


  1. ^ a b c d e Serryer, J. (13 May 1926). "Le monoplan Hanriot H-25". Les Ailes (256): 2–3.