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Piasecki HUP Retriever
Land	Usa
Roll	Nyttohelikopter
Första flygningen	Mars 1948
Byggd	339

Den Piasecki H-25 Army Mule/HUP Retriever var en kompakt enkelradialmotor, dubbel överlappande tandemrotor nyttohelikopter utvecklad av Piasecki Helicopter Corporation i Morton, Pennsylvania under slutet av 1940-talet och tillverkad under början av 1950-talet. Företaget bytte namn 1956 till Vertol Aircraft Corporation och köptes därefter av Boeing Aircraft Company 1960 och blev Boeing-Vertol.

Källkod: Piasecki HUP Retriever på Wikipedia

Piasecki HUP-3 (H-25A) Retriever Gå Runt
Fotograf	Vladimir Yakubov
Lokalisering	Pima luft- och rymdmuseum, Tuscon
Bilder	27

Piasecki HUP-3 Retriever 01

Piasecki HUP-3 Retriever 02

Piasecki HUP-3 Retriever 03

Piasecki HUP-3 Retriever 04

Piasecki HUP-3 Retriever 05

Piasecki HUP-3 Retriever 07

Piasecki HUP-3 Retriever 06

Piasecki HUP-3 Retriever 08

Piasecki HUP-3 Retriever 09

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Piasecki HUP-2 Gå runt
Fotograf	Unknow
Lokalisering	Unknow
Bilder	32

Piasecki HUP-2

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The Compact Tandem Workhorse

Den Piasecki HUP-3 Retriever (known in the Army as the H-25 Army Mule) was a compact tandem-rotor helicopter designed specifically for the tight confines of aircraft carrier decks. By placing the rotors in a tandem configuration—one at the front and one at the rear—Piasecki eliminated the need for a tail rotor, which allowed the aircraft to be shorter and more stable in crosswinds. The HUP-3 was the refined version of the series, primarily serving in search and rescue (SAR) and utility roles during the early 1950s.

Attribute	Technical Specification (HUP-3)
Roll	Search and Rescue (SAR) / Utility Helicopter
Crew / Capacity	2 Pilots / 4-5 Passengers or 3 Litters
First Flight (HUP series)	Mars 1948
Kraftverk	1 × Continental R-975-46A radial engine
Horsepower	550 hp (410 kW)
Maximum Speed	105 mph (169 km/h)
Rotor Diameter	35 ft 0 in (10.67 m) each
Length (Rotors turning)	56 ft 11 in (17.35 m)

Engineering Innovations and Tandem Flight

Overlapping Rotors: To keep the fuselage as short as possible for carrier elevators, the front and rear rotors were designed to overlap. They were synchronized via a drive shaft to ensure the blades never collided.
No Tail Rotor Advantage: Because the two rotors counter-rotated, they cancelled out each other’s torque. This meant all engine power went toward lift and thrust, making the HUP series very efficient for its size and exceptionally stable during hovering.
The Rescue Hatch: The HUP-3 featured a large rectangular hatch in the floor of the cabin. A rescue hoist was mounted directly above it, allowing the crew to lift a person straight up into the center of the aircraft while in a hover.
Canted Vertical Fins: Early models lacked the large vertical fins seen on the HUP-3. These “end plates” on the rear pylon were added to improve directional stability during high-speed forward flight.

Service History and Variants

Carrier Plane Guard: Before the HUP, destroyers often followed carriers to pick up downed pilots. The HUP-3 allowed the helicopter to act as the “Plane Guard,” hovering near the carrier during flight ops to provide immediate rescue capability.
Army “Mule”: The Army version, the H-25A Army Mule, featured power-boosted controls and a reinforced floor for cargo. However, the Army found the tandem design less suited for field operations than the Navy did for sea duty.
All-Metal Blades: The HUP-3 was among the first to benefit from all-metal rotor blades, which were far more durable in the humid, salty conditions of naval service than earlier wooden or fabric-covered versions.
Preservation: Several HUP Retrievers are preserved in museums today, including the Nationella marinflygmuseet in Pensacola and the Pima Air & Space Museum in Arizona.