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Akaflieg Berlin B4 F.F. 
Summary
The Akaflieg Berlin B4 F.F. was a single-seat aircraft built in Germany in the early 1930s. It was a high-wing monoplane of all-wood construction with fabric-covered foldable wings[1]
| B4 F.F. | |
|---|---|
| |
| The B4 over Johannisthal | |
| Role | Light aircraft |
| National origin | Germany |
| Manufacturer | Akaflieg Berlin |
| Designer | Walter Stender, dr. Martin Schrenk and Gerald Klein |
| First flight | December 1931 |
| Number built | 1 |
Design and development edit
In 1931 the Deutsche Luftfahrt-Verband e.V. (DLV) opened a competition for an inexpensive light aircraft. Two entries were put forward; Akaflieg Berlin's B4 F.F. (D-2229) and Dipl.-Ing. Hermann Mayer's MM-1 (D-2230), with both aircraft exhibited at the 1932 Deutschen Luftsport-Ausstellung (DELA) in Berlin.[2]
Like the Mayer MM-1 the B4 F.F. was constructed at the DLV workshops in Adlershof. Design took eight months and construction a further nine.[2]
Specifications (B4 F.F.) edit
Data from [2]
General characteristics
- Length: 5.7 m (18 ft 8 in)
- Wingspan: 9 m (29 ft 6 in)
- Height: 2.4 m (7 ft 10 in)
- Wing area: 10 m2 (110 sq ft)
- Aspect ratio: 8
- Empty weight: 185 kg (408 lb)
- Gross weight: 285 kg (628 lb)
- Powerplant: 1 × Daimler F7502 , 15 kW (20 hp)
- Propellers: 2-bladed fixed-pitch propeller
Performance
- Maximum speed: 125 km/h (78 mph, 67 kn)
- Service ceiling: 3,500 m (11,500 ft)
- g limits: +8 (ultimate load factor)
- Wing loading: 28.5 kg/m2 (5.8 lb/sq ft)
- Power/mass: 19.18 kg/kW (31.53 lb/hp)
References edit
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