Piasecki HUP-1 Retriever - summary version[/heading]
XHJP-1 - a small twin-rotor coupling and rescue helicopter for the aircraft carriers; 1 prototype
HUP-1 - the serial variant, 38 pcs
HUP-2 - a variant with the autopilot Sperry, without a tail; 192 pcs
HUP-2S - conversion of 12 HUP-2 for anti-submarine tasks, the suspension of the sonar
HUP-3 - marking 50 H-25A taken námořnitvem
HUP-4 - conversion with an engine Wright R-1300, 1 pcs
H-25A Army Mule - a variant for the army, reinforced floor, hydraulic power steering; 70 pcs
UH-25B - the designation HUP-2 after 1962
UH-25C - the designation HUP-3 after 1962
Munson, Kenneth. Helicopters and other Rotorcraft since 1907. Blandford Press, London 1973. ISBN 0-7137-06104.
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