SFCA Lignel 10
# SFCA Lignel 10

The SFCA Lignel 10 was a French single seat aircraft designed to bridge a training gap between basic trainers and front-line fighters. The military requirement was soon dropped and only one was built.

## Design and development

The Lignel 10 of 1938 was a wooden low wing cantilever monoplane, one in the series of Société Française de Construction Aéronautique designs stretching back to the 1935 SFCA Maillet 20. It was a single-seater, intended to meet a military requirement for a trainer that would assist the pupil's transition from simple two seat trainers to faster and more complex fighters with flaps and retractable undercarriages. The wings of the Lignel 10, like those of the rest of the series were in three parts, with a rectangular plan centre section without diheral and outer panels which, on the Lignel 10, had about 6° of dihedral. The leading edges of these outer panels were straight and only slightly swept but the trailing edges were increasingly curved towards the wing tips. Inset ailerons and the split flaps were both on the outer panels.

The Lignel 10 was powered by a 160 kW (220 hp) Renault 6Q-03 air-cooled, supercharged, inverted 6 cylinder inline engine. The cockpit, enclosed under multi-part glazing, placed the pilot over the wing trailing edge. The rear fuselage was raised to continue the canopy line, dropping gently away to the tail. Its fin and tailplane, the latter mounted at mid-fuselage, had straight, swept edges but rounded tips and carried round-edged, unbalanced control surfaces. The rudder extended down to the keel and worked in a small elevator cut-out.

Its tailwheel landing gear had its main legs mounted at the outer ends of the wing centre section at about 40% chord, retracting outwards into the outer wing panels, Each leg carried a single landing wheel.

The Lignel 10 first flew in February 1938. It was undergoing tests at Villacoublay in July, completing them by December 1938. Only one was built as the military requirement was soon abandoned.

## Specifications (Lignel 10)

Data from L'Aéronautique December 1938

General characteristics

* Crew: One
* Length: 7.85 m (25 ft 9 in)
* Wingspan: 10.26 m (33 ft 8 in)
* Height: 2.65 m (8 ft 8 in)
* Wing area: 15 $m^2$ (160 sq ft)
* Empty weight: 800 kg (1,764 lb)
* Gross weight: 1,200 kg (2,646 lb)
* Powerplant: 1 × Renault 6Q-03 air-cooled, supercharged, inverted 6 cylinder inline, 160 kW (220 hp) at 2,000 m (6,560 ft)
* Propellers: 2-bladed

Performance

* Maximum speed: 370 km/h (230 mph, 200 kn) at 2,000 m (6,600 ft)
* Cruise speed: 349 km/h (217 mph, 189 kn)
* Endurance: 3 hr 30 min
* Service ceiling: 8,000 m (26,000 ft)
* Time to altitude: 11 min to 4,000 m (13,000 ft)
