Piasecki H-25 - Variants

Variants

XHUP-1

The first two prototypes.

HUP-1

Utility transport, search and rescue helicopter for the US Navy, powered by a 525 hp (391 kW) Continental R-975-34 piston engine.

HUP-2

Improved version, powered by a 550 hp (410 kW) Continental R-975-46 piston engine. Later redesignated UH-25B in 1962.

HUP-2S

This designation was given to 12 HUP-2s. The HUP-2S was an anti-submarine warfare helicopter, fitted with a dunking sonar equipment.

HUP-3

Utility transport helicopter for the US Navy, powered by a 550 hp (410 kW) Continental R-975-46A piston engine. Similar to the H-25A "Army Mule", later redesignated UH-25C in 1962.

H-25A Army Mule

Utility transport helicopter for the US Army, powered by a 550 hp (410 kW) Continental R-975-46A piston engine, fitted with large doors, power-boosted controls and strengthened floors. It was called the H-25A "Army Mule". Seventy were delivered from 1953, but they proved unsuitable for front-line use, with 50 transferred to the Navy from 1955, and the remaining helicopters used for training, being withdrawn completely from Army service by 1958.