WGM.21
General information
Type	Quadrotor helicopter
National origin	Germany
Manufacturer	Aerotechnik
History
Introduction date	1969

The Aerotechnik WGM.21 is a quadrotor helicopter that was developed in the 1970s.

Contents

• Design and development
• Variants
• Aircraft on display
• Specifications (WGM.21)
• References

Design and development

The WGM.21 is an open cockpit quadrotor. Four rotors are mounted at the end of a four tubular supports arranged into a X shape. Cyclic and collective controls are mixed into a single control yoke. Pitch is controlled by foot pedals. A second model, the WGM.22, was developed with side-by-side configuration seating and an enclosed cockpit. ^[1]

Variants

WGM.21

Single seat prototype

WGM.22

Two seat enclosed version

Aircraft on display

• Hubschraubermuseum Bückeburg - prototype

Specifications (WGM.21)

Data from Air Progress

General characteristics

• Crew: 1
• Empty weight: 90 kg (198 lb)
• Gross weight: 335 kg (739 lb)
• Powerplant: 1 × BMW 700 Automotive conversion, 40 kW (54 hp)
• Main rotor area: 21.3 m² (229 sq ft)

Performance

• Maximum speed: 125 km/h (78 mph, 67 kn)
• Cruise speed: 115 km/h (71 mph, 62 kn)
• Service ceiling: 2,100 m (6,900 ft)

References

Wikimedia Commons has media related to Aerotechnik WGM.21 .