https://en.wikipedia.org/wiki/Cierva_C.24

General characteristics

• Crew: 2
• Length: 20 ft 0 in (6.10 m)
• Main rotor diameter: 34 ft 0 in (10.36 m)
• Empty weight: 1,280 lb (955 kg)
• Gross weight: 1,800 lb (1,343 kg)
• Powerplant: 1 × de Havilland Gipsy III 4-cylinder inverted air-cooled inline, 120 hp (90 kW)

Performance

• Maximum speed: 115 mph (185 km/h)
• Cruise speed: 100 mph (164 km/h)
• Range: 350 miles (563 km)