- Source: Pemberton-Billing P.B.25
The Pemberton-Billing P.B.25 was a First World War British single-seat scout aircraft built by Pemberton-Billing Limited, later Supermarine Aviation Works Limited.
Design and development
The P.B.23 was designed in 1915 as a single-seat biplane scout, with a fuselage nacelle strut-mounted between the wings. The nacelle had an open cockpit for the pilot at the front and at the rear an 80 hp (60 kW) Le Rhône 9C engine driving a pusher propeller. Twin fins and rudders were mounted on a wide-span tailplane with an elevator attached, all connected to the wing structure with four tailbooms. The P.B.23 failed to gain an order after it first flew in September 1915, but twenty of an improved version, the P.B.25, were ordered by the Royal Naval Air Service. The P.B.25 had swept-back wings, a modified landing gear and a revised fuselage nacelle and although originally powered by a 110 hp (82 kW) Clerget rotary engine, the 20 RNAS aircraft were fitted with Gnome Monosoupape 9 Type B-2 rotary piston engines.
Operational history
The aircraft, which were not used operationally, were based at RNAS Hornchurch and RNAS Hendon, where they were probably used in the training role.
Operators
United Kingdom
Royal Naval Air Service
Specifications (P.B.25)
Data from The British Fighter since 1912General characteristics
Crew: 1
Length: 24 ft 1 in (7.34 m)
Wingspan: 33 ft 0 in (10.06 m)
Height: 10 ft 5 in (3.18 m)
Wing area: 277 sq ft (25.7 m2)
Empty weight: 1,080 lb (490 kg)
Gross weight: 1,576 lb (715 kg)
Powerplant: 1 × Gnome Monosoupape 9 Type B-2 9-cylinder air-cooled rotary piston engine, 100 hp (75 kW)
Propellers: 4-bladed fixed-pitch pusher propeller
Performance
Maximum speed: 99 mph (159 km/h, 86 kn) at sea level
Range: 200 mi (320 km, 170 nmi) (approx.)
Time to altitude: 6,000 ft (1,829 m) in 8 minutes 30 seconds
Armament
Guns: 1× Forward Firing 0.303 in (7.70 mm) Lewis machine gun
See also
Related lists
List of aircraft of the Royal Naval Air Service
References
Further reading
The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.