The Heinkel Doppeldecker 43 was a prototype German fighter aircraft of the 1930s. A single-engined, single-seat biplane, the HD 43 was designed to meet a secret German Reichswehr requirement for a single-seat fighter. It had two-bay wooden wings with a steel-tube fuselage, and was powered by a 750 hp (600 kW) BMW VI engine. The single prototype flew in 1931.^[1]

It was evaluated against the Arado Ar 65, with the Arado being selected and no production of the Heinkel followed.^[1]

Specifications

Data from The Complete Book of Fighters ^[1]

General characteristics

• Crew: 1
• Length: 7.1 m (23 ft 4 in)
• Wingspan: 10 m (32 ft 10 in)
• Height: 3.3 m (10 ft 10 in)
• Wing area: 26.56 m² (285.9 sq ft)
• Empty weight: 1,280 kg (2,822 lb)
• Gross weight: 1,700 kg (3,748 lb)
• Powerplant: 1 × BMW VI 7.3 Z V-12 liquid-cooled piston engine, 559 kW (750 hp)
• Propellers: 2-bladed fixed-pitch propeller

Performance

• Maximum speed: 322 km/h (200 mph, 174 kn)
• Time to altitude: 3,000 m (9,800 ft) in 4 minutes 54 seconds

Armament

• Guns: provision for two machine guns