Mil Mi-18 / Mi-173

An Mi-17 with an 0.9m fuselage extension, retractable undercarriage and modified cabin doors. Prototype only was built.

Mi-18
Engines: 2 x TV3-117MT turboshaft, 1425kW
Crew: 3
Passengers: 30
Main rotor diameter: 21.3m
Max take-off weight: 11500-13000kg
Empty weight: 7550kg
Max speed: 270km/h
Cruising speed: 240km/h
Hovering ceiling, IGE: 3200m
Service ceiling: 5550m
Range: 580km
Payload: 3000-5000kg