American twin-engined, tandem rotor, heavy-lift helicopter (civilian model Boeing 234).

Function: transport

Manufacturer: Boeing

Produced: 1962 –

Rotor diameter: 2x 18 m

Lenght: 30 m (fuselage lenght 16 m)

Max. takeoff weight: 22680 kg

Max. speed: 310 km/h

Engine: Lycoming T55-GA-714A turboshaft engines, 3,529 kW each

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Boeing 234, scratch build

Rotor diameter: 2x 1,6 m

Lenght: 1,8 m (fuselage lenght 3 m)

Takeoff weight: 14 kg