Francillon gives the following:
Rotor diameter: 31' 9" (9.45 m)
Length: 20' (6.1 m)
Height: 9' 3" (2.74 m)
Empty weight: 2,450 lb (1,111 kg)
Loaded weight: 5,000 lb (2,268 kg
Max weight: 6,300 lb (2,858 kg)
Rotor loading: 6.6 lb/sq ft (32.3 kg/sq m)
Max speed: 138 mph (222 km/h)
Cruise speed: 109 mph (175 km/h)
Rate of Climb: 2,400 ft/min (12 m/sec)
Hover Ceiling in Ground Effect: 12,000' (3,660 m)
Range: 98 miles (158 km)
It's roughly 40% of the size of the K-Max with 42% of the load capacity,
really not too shabby for the period.