Skandinaviska Aero BHT-1 Beauty
On 7 May 1943 three young engineers sat in the Bacchi Wapen restaurant in Stockholm together with Åke Forsmark, manager of Skandinaviska Aero, and chatted about aircraft. The three were Erik Bratt, Karl-Erik Hilfing and Björn Törnblom, all students at Kungliga Tekniska Högskolan, the Royal Technical University in Stockholm. Their ideas gradually evolved into this sketch, on the back of a menu. It was originally meant to be a glider towing aircraft, and by May 1944 the design work was complete, with 4,000 drawings and 2,500 load calculations, performed by Törnblom, the only one of the three who had previous experience in aircraft design. He also designed the wings, fin and rudder. Hilfig was responsible for the fuselage and Bratt worked on the engine installation, propeller and landing gear.
The BHT-1 is a wooden low-wing cantilever monoplane with a retractable tailwheel landing gear. Powered by a 60 hp (45 kW) Walter Mikron 4 piston engine it has an enclosed single-seat cockpit. The wings include slotted flaps.
The BHT-1 Beauty was built by Skandinaviska Aero of Stockholm and first flew on 4 December 1944. Only one, SE-ANX, wa built.
The BHT-2 was a proposed two-seat development. A prototype constant speed propeller was developed for the aircraft using differential between engine oil, and ram air pressure to control pitch.
Engine: 1 × Walter Mikron 4, 45 kW (75 hp)
Length: 5.80 m (19 ft 0 in)
Wingspan: 6.82 m (22 ft 4½ in)
Height: 1.90 m (6 ft 3 in)
Wing area: 7 m2 (75.3 ft2)
Empty weight: 240 kg (538 lb)
Gross weight: 420 kg (924 lb)
Maximum speed: 250 km/h (155 mph)
Cruising speed: 210 km/h (130 mph)
Range: 1700 km (1056 miles)
Service ceiling: 7500 m (24600 ft)