Potez 26

Potez 26
General information
Type	Single seat fighter
National origin	France
Manufacturer	Henry Potez
Number built	1
History
First flight	August 1924
Developed from	Potez 25

The Potez 26 was a single seat fighter aircraft designed and flown in France in the mid-1920s. It did not reach production.

Design and development

The Potez 26 was a lighter, smaller span, single-seat fighter version of the two-seat biplane Potez 25 reconnaissance aircraft. Both types were sesquiplanes with markedly smaller lower wings. ^[1] Both upper and lower wings were rectangular in plan, with long-span ailerons only on the upper plane. They were single bay biplanes, their wing interconnected by N-form interplane struts assisted by wire bracing. These interplane struts leaned outwards and narrowed to meet the closer spars of the smaller-chord lower wing. Centrally, the upper wing was held over the upper fuselage by two pairs of struts, a parallel pair forward and an inverted V at the rear forming a cabane. There was a semicircular cut-out in the upper trailing edge to improve the pilot's forward view. ^[2]

The Potez 26 was powered by either a 340 kW (450 hp) Hispano-Suiza 12J V-12, or the 340 kW (450 hp) Lorraine 12Ed W-12, both cooled by a radiator under the rear of the engine cowling. The engine mounting enabled a rapid exchange of engines; the Lorraine W engine installation reduced the overall aircraft length by 350 mm (13.8 in). The mounting formed part of the forward fuselage structure, which had a plywood skinned central section containing the open cockpit, ^[1] raised above the structural fuselage, with decking falling away ahead and behind ^[2] and a wooden framed, fabric covered rear. ^[1] At the rear, the tailplane was mounted on the upper fuselage structure and externally braced to it from below with pairs of inverted V struts. Its fin was small and round edged, carrying a broad, deep rudder which reached down to the keel. ^[2]

The Potez 26 had a fixed tail wheel undercarriage with mainwheels on a split axle supported centrally by a V-strut, hinged on another pair of struts to the lower fuselage and with vertical, airfoil section shock absorbers. ^[1] There was a sprung tailskid. ^[2]

The Potez 26 made its first flight in August 1924 ^[3] and was on display at the 1924 Paris Salon. ^[1] Only one was built. ^[3]

Specifications (Lorraine engine)

Data from L'Aérophile Salon-1924 ^{[1] [4]}

General characteristics

• Crew: One
• Length: 7.65 m (25 ft 1 in)
• Wingspan: 12.0 m (39 ft 4 in)
• Height: 3.15 m (10 ft 4 in)
• Wing area: 32 m² (340 sq ft) (upper 26.5 m² (285 sq ft), lower 5.5 m² (59 sq ft)) ^[2]
• Empty weight: 1,100 kg (2,425 lb)
• Gross weight: 1,550 kg (3,417 lb)
• Powerplant: 1 × Lorraine 12Ed W-12 water-cooled piston engine, 340 kW (450 hp)
• Propellers: 2-bladed

Performance

• Maximum speed: 250 km/h (160 mph, 130 kn) at 5,000 m (16,000 ft)
• Service ceiling: 8,500 m (27,900 ft)
• Time to altitude: 5,000 m (16,000 ft) in 20 minutes
• Landing speed: 90 km/h (56 mph)

Armament

• Two fixed, forward firing 7.7 mm (0.303 in) Vickers machine guns on top of engine cowling.

References

1. "L'Aérophile Salon-1924". L'Aérophile. pp. 23, 25.
2. Serryer, J. (29 January 1925). "Le sesquiplane Henry Potez". Les Ailes (189): 2.
3. "Potez 26" . Retrieved 27 September 2014.
4. "Quelques characteristiques des Avions du Salon". L'Aérophile. 1–15 January 1925. p. 6.