The Baumgärtl Heliofly III/57 and Baumgärtl Heliofly III/59 were 1940s experimental backpack helicopters designed and built by the Austrian-designer Paul Bäumgartl.[1] Following on from his earlier experiments with strap-on autgyros the Heliofly III/57 was powered by two 8 hp (6 kW) Argus As 8 piston engines each driving a single-blade of the contra-rotating rotors.[1][2]

A problem with the supply of the As 8 engine forced a re-design to use one 16 hp (12 kW) engine,[1] powering two rotors on a common co-axial shaft, with the engine driving one rotor directly and the other through gearing to overcome the torque effects.[1][2]

Specifications (16hp)

Data from [1] The Illustrated Encyclopedia of Aircraft

General characteristics

• Crew: 1
• Length: 6.10 m (20 ft 0 in)
• Empty weight: 35 kg (77 lb)
• Gross weight: 120 kg (265 lb)
• Powerplant: 1 × piston engine , 12 kW (16 hp)
• Main rotor diameter: 2 × 6.10 m (20 ft 0 in)

See also

Related lists

• List of rotorcraft

References

Notes

Bibliography

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