21 February 1962 (16H-1) 15 November 1965 (16H-1A)[1]
The Piasecki 16H was a series of compound helicopters produced in the 1960s. The first version of the Pathfinder, the -1 version, first flew in 1962. The similar but larger Pathfinder II, the 16H-1A, was completed in 1965.
Variants
Model 16H-1 Pathfinder
one PWC PT6B-2 with one 405 shp turboshaft engine
Model 16H-1A Pathfinder II
larger version with one 1,250 shp (930 kW) T58-GE-8
Model 16H-1C Pathfinder III
proposed conversion of the 16H-1A with one 1,500 shp (1,100 kW) T58-GE-5 [2]