Back Piasecki HUP "Retriever"
1949

Piasecki HUP-1

This tandem-rotor design was evolved by Piasecki Helicopter Corporation to meet a Bureau of Aeronautics requirement, issued in 1945, for a utility helicopter to be based aboard aircraft carriers and other large warships of the U.S. Navy for search and rescue, plane guard and general transportation duties. The proposed aircraft was given the works designation PV-14 and a prototype was completed for U.S. Navy evaluation as the XHJP-1. In 1948 work began on three pre-series HUP-1's, as the production version was known, and from 1950-52 a further twenty-two HUP-1 Retrievers were delivered to the U.S. Navy. They differed little from the original XHJP-1, the major apparent change being the addition of inward-sloping endplate fins to the horizontal stabilisers below the rear rotor head. Both sets of 3-blade rotors could be folded for shipboard stowage and the HUP-1, powered by a single 525hp Continental R-975-34 piston engine, could accommodate 4-5 passengers or 3 casualty litters in addition to the 2-man crew.

Successful tests with a Sperry autopilot in the XHJP-1 enabled the next model, the HUP-2, to be built without tail surfaces and the more powerful Continental R-975-46 was installed in this and all subsequent production models. Another feature of the Retriever was a large rectangular rescue hatch offset to starboard in the floor of the front fuselage, through which a winch inside the cabin could lift weights of up to 181kg at a time. One hundred and ninety-three Naval HUP-2's were built; fifteen of these were supplied to France's Aeronavale, and the U.S. Navy machines included some completed as HUP-2S submarine-hunting aircraft with dunking sonar equipment. Another HUP-2 was given a sealed, watertight hull and outrigged twin floats for waterborne tests, presumably as part of the development programme for the Boeing-Vertol 107 / CH-46 helicopter. In 1951 the U.S. Army ordered a version of the HUP-2 with a reinforced cabin floor and hydraulically boosted controls, for general support and evacuation work. Seventy of these were delivered as H-25A Army Mule from 1953, as were fifty similar Naval HUP-3's (including three for the Royal Canadian Navy) for ambulance and light cargo duties. Production of the three hundred and thirty-ninth and last aircraft was completed in July 1954. Shortly after this a proposal was made to boost the speed, range and payload of all H-25/HUP aircraft still in service by refitting them with 700hp Wright R-1300-3 engines. However, this did not take place and by the time the new tri-service designation system was introduced in July 1962 only the HUP-2 and HUP-3 remained in service; these became the UH-25B and UH-25C respectively. Neither type is now in U.S. front-line service, and the French and Canadian HUP types were withdrawn from service in 1966.

K.Munson "Helicopters And Other Rotorcraft Since 1907", 1968

Piasecki H-25A

After the first "flying banana", Piasecki immediately set to work on a specification, issued by the US Navy Bureau of Aeronautics in 1945, for a shipboard helicopter to be used on aircraft carriers and larger vessels for SAR, liaison, replenishment and plane guard duties.

The result was the PV-14 (designated XHJP-1 by the US Navy). Three pre-production aircraft, the HUP-1, were ordered in 1948; this was followed between 1950 and 1952 by a full production batch using the 525hp Continental R-975-34 radial engine, which could carry two crew plus four-five passengers or three stretcher cases. The power-plant was installed at the center of the fuselage, which had a steel tube framework with particularly strong, fixed tricycle landing gear. The fin of the HUP-1 was subsequently eliminated, as further improved versions were fitted with an autopilot. The US Navy versions had all-weather instrumentation and some were equipped with sonar for antisubmarine warfare.

The HUP-1 kept the classic, tandem rotor configuration, but had a smaller, more compact fuselage than its predecessors. This enabled the helicopter to be stowed without having to fold back the rotor blades. Once acceptance trials were over, the US Navy ordered 32 aircraft, followed by another 165 of the HUP-2, which was fitted with a more powerful engine. The Marines also used 13, while the Army acquired 70, designated H-25A, 50 of which were later transferred to the Navy as HUP-3s. Finally, 15 HUP-2s were built for the French Navy and three for the Canadian Navy. All these helicopters were withdrawn in 1956, but in the period from 1950-53, they received their "baptism of fire" in Korea, where they performed intensive transport, liaison and rescue missions, both on land and at sea. At the height of their career, they were in fact carried aboard all the aircraft carriers of the American fleet for rescue operations.

G.Apostolo "The Illustrated Encyclopedia of Helicopters", 1984

Piasecki HUP-2

Originally designed to meet a U.S. Navy requirement for a shipboard utility helicopter, the Piasecki Model PV-18 first flew in 1948 and entered regular Navy service the following year as the HUP-1 Retriever. In 1950 the Army, in the process of rapidly enlarging its helicopter fleet, evaluated several examples of the improved HUP-2 variant and judged the type suitable for use in the general utility role. A total of seventy H-25A aircraft (serials 51-16572 to -16641) were subsequently procured through an Air Force-managed contract, with the first of these entering regular Army service in early 1953.

The Army Mule, as the H-25 was officially named, was a single engined, tandem rotor aircraft of fairly conventional design. The type was basically similar in general layout to the HUP-2, sharing that aircraft's all-metal fuselage, fixed three-point landing gear, and 550hp Continental R-975-42 engine. The H-25A differed from the Navy variant primarily in having hydraulically-boosted controls, a strengthened floor with cargo tie-down fittings, and modified doors intended to ease the loading and unloading of stretchers.

Though a rugged and fairly capable aircraft the H-25A ultimately proved unsuited to the rigors of front-line Army service, and fifty of the seventy examples procured were turned over to the Navy beginning in 1955. Those Army Mules that remained in Army service were used mainly as training or medical evacuation aircraft, and the type was totally withdrawn from Army service by 1958.

S.Harding "U.S.Army Aircraft since 1947", 1990

Piasecki HUP-3

The 'flying banana' shape of the HRP-1 was discarded in the Piasecki Model PV-14, of which two XHJP-1 prototypes were ordered for evaluation in the rescue and aircraft-carrier plane-guard roles. This model was developed into the PV-18, US Navy designation HUP-1, which featured angled endplate fins on the horizontal tail surfaces mounted on the rear rotor pylon. Some 32 HUP-1s, each powered by a single 391kW Continental R-975-34 engjne, were built for the US Navy between February 1949 and 1952; the first squadron, HU-2, took delivery of its initial aircraft in February 1951.

Successful Sperry autopilot trials in an XHJP-1 led to development of the HUP-2, whose improved directional ability allowed the endplate fins to be deleted, and the more powerful 410kW R-975-46 engine was fitted. A total of 339 was built, including 193 for the US Navy. A number of these were designated HUP-2S when fitted with dunking sonar equipment for anti-submarine operations. Some 15 HUP-2s were also supplied to the French navy. The US Army ordered an initial batch of an improved version in 1951, this being known as the H-25A Army Mule. Powered by the R-975-46A engine, the H-25A introduced power-boosted controls, strengthened floors and enlarged cargo doors. Fifty similar machines were transferred to the US Navy under the designation HUP-3, three serving with the Royal Canadian Navy's Squadron VH-21. Underthe unified designation system introduced in September 1962, the HUP-2 and HUP-3 were redesignated UH-25B and UH-25C respectively.

D.Donald "The Complete Encyclopedia of World Aircraft", 1997

От формы "летающий банан" вертолета HRP-1 в конструкции другого вертолета Piasecki Model PV-14 отказались. Два его опытных экземпляра XHJP-1 для испытаний в роли спасательного и палубного вертолета для охраны авианосцев были усовершенствованы в вертолет PV-18 (HUP-1 в ВМС США). Он отличался угловатыми разнесенными килями, расположенными на горизонтальных хвостовых поверхностях, установленных на пилоне заднего винта. С 1949 по 1952гг. для ВМС США были построены 32 вертолета HUP-1 с двигателем Continental R-975-34 мощностью 391кВт.

Модель HUP-2 с автопилотом Сперри и улучшенной путевой устойчивостью с двигателем R-975-46 мощностью 410кВт уже не имела разнесенных килей. Всего было построено 339 экземпляров, в том числе 193 для ВМС США, 15 поставлены ВМС Франции. Некоторые из них после установки погружающегося противолодочного радиолокационного оборудования были обозначены HUP-2S. Армия США заказала в 1951 году первую партию Н-25А "Army Mule". Он имел двигатель R-975-46A и обратимое бустерное управление, усиленный пол и увеличенные грузовые двери. 50 сходных вертолетов были переданы ВМС США под обозначением НUР-3. В 1962 году вертолеты HUP-2 и HUP-3 были переименованы в UH-25B и UH-25C.


Photo Gallery 

The Piasecki XHJP-1 Retriever featured all-metal construction, side-by-side pilot seating, and compact dimensions for Navy shipboard use.

Chronic engine problems compromised the reliability of the otherwise excellent HUP-2.

Technical data for Piasecki HUP-3

Engine: 1 x Continental R-975-46A radial pistone engine, rated at 410kW, rotor diameter: 10.67m, length with rotors turning: 17.35m, height: 3.81m, take-off weight: 2767kg, empty weight: 1782kg, max speed: 169km/h, service ceiling: 3050m, range: 547km

Comments 
Tom, e-mail, 25.10.2016

I am a docent aboard Midway Museum and want to find out about the chain or band which drove the forward transmission of the HUP. Rumor is it was a "rubber band" and then replaced with a "bicycle chain."
Can someone steer me in the right direction?
Thanks
Tom

Reed Carr, e-mail, 21.01.2015

Flew the HUP-2 in training at Ellyson Field, 1957, did a full auto in training, with the schedules officer as my instructor that day. He didn't fly very much, I guess, as he was hesitant to allow me to try one, but I talked him into doing one (better than his demo). Later ferried a few of them from Dothan, AL when the Army gave or sold some to the Navy. There were Hup-3's, but not much different from the -2. Had a little more stability, but it was a 4-5 day trip from Dothan to San Diego in 1961 & 2. I was never in a real hurry.

Mr Excel, e-mail, 30.08.2014

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Heeft u een dringende lening? Zo ja dan contact met ons op (excelservices.managementonline@gmail.com) voor meer informatie.

KENNETH AARON, e-mail, 30.08.2014

KNOW THE HUP WAS AT REAM FIELD 57 58 IN THE FIRE HOUSE CRASH RESSCUE HAD ONE TO GO DOWN ONE NIGHT SOME RESERVES WAS FLYING LUCKLY NO INJURIES LATER WENT ABOARD THE FLOYD B PARKS DD884 ON THE 59 DEPLOYMENT WAS OPERATING WITH THE FLATTOP HANCOCK ONE WAS FLYING ALONG WITH THE CARRIER WHILE THE PLANES WAS DOING TOUCH AND GO ITS ENGIN QUIT HELPED GET THE CREW OUT OF THE WATER ALSO NO INJURIES

KENNETH AARON, e-mail, 25.08.2014

KNOW THE HUP WAS IN THE FIRE HOUSE ON REAM 57 58 HAB ONE TO GO DOWN LUCKLY NO INJURYS HAVE A PIECE OF THE ROTOR BLADE

Roger Miller, 20.07.2014

I was stationed at NAS REAM Field in HS 2, next door to HU1.We were an anti sub squadron with dipping SONAR. The HUP was to be used but it did not have enough power to lift our gear. This was in 1952. It was replaced with a HO4S Sikorsky. There is a beautiful HUP on the flight deck of the USS MIDWAY in San Diego. It has HU-1 markings on it. We had a blade shatter on the HUP,I have a piece of it. The skin on the blade was made of a thin plywood. I was an AE3.

Paul Ridgwell, e-mail, 20.12.2013

Hi, I was researching some old photographs and, whilst looking for details on an HUP-2, I came across this page. I have a 6"x4" b&w print of an HUP-2 taken probably around 1954 in southern England. It is coded 80 and UR but I can't quite make out the Bu. No. If it is of interest I can scan & email it for you? Kind regards
Paul Ridgwell U.K.

gerry hoffer, e-mail, 25.09.2013

In 1952 the lightning strike marking for this aircraft was designed at Rockliiff Airbase. Can you find qa copy of that engineering drawing.

Bob Knotts, e-mail, 17.09.2013

I flew handheld aerial photos in a hup-2 at NAS Alameda in 1958-60. I remember the hatch in the bottom came unlatched while I was standing on it. A real thrill!! I think a hydraulic cyl. kept it from opening all the way. I used to fly with another Knotts (plane captain),and the pilot was a CDER Smith. We would sometimes go up to 10,000 feet, which took forever. We landed one and reported a brush fire N of the Golden gate Bridge, and got chewed for an unauthorized landing. Bob KNOTTS, PHCM, USN, RET

Jim, e-mail, 25.11.2012

i have R-975-46 in my air boat do any of you Gentlemen know where to get
parts ( gaskets )

marcel, e-mail, 13.05.2012

I would like to know more about the blades

KB, e-mail, 30.07.2011

We have six Helic Mod. HUP-2 blades manufactured in 1952 with plates showing Part No.18R1009-47 on 3 of them and 18R1009-48 on the other 3 ,Contr No., Blade Serial No, Set Serial No. etc, Silver Soldered Fin Spar, I believe made by Parsons Corp. in Traverse City, Mi. and later discontinued. Do any museums or organizations buy parts for their restorations or great display item, we'd like to sell these if anyone's interested.

Scott Schmidt, e-mail, 20.06.2011

I have an old toy air plane it has marking on the back that is UR 68 NAVY is there any where that you know of to get parts to bring it back to the original condition?
Thank you for your time.
Scott Schmidt

shoes, e-mail, 16.06.2011

These things pop up like toadstools after a rain. You can't tell where the next one will be.

bob stacey, e-mail, 31.12.2010

i was at ellyson field[ht-8]1961-dec.1962 hm3 STACEY 527-64-78

Richard L. Holley, e-mail, 14.12.2010

I was stationed with HU-1 from 1957 to 1958 and flew in the HUP, it was loud. There is a HUP aboard the Hornet @ NAS Alameda. The Hornet is now a Museum.
One of the mechanics at Rheem now lives 4 blocks from me here in Fremont. We attend the same church. He is Bill Marshall.

Tom Sceurman, e-mail, 08.12.2010

First flights in the HUP-2 was at Ellison Fld, Pensacola, FL. Then flew the HUP-2 and HUP-3 (Hyd boost) at HU-2 Lakehurst on detachment to carriers on the East coast. Ended up with 900 hrs of no accidents or incidents. Did not fly fast - I brought the last HUP from Hayes Aircraft Dothan AL overhaul to Lakehurst. Blade stalled at about 70 kts, but loved to fly it.

Robert Bareikis, e-mail, 29.11.2010

I flew about 1,000 hours in the HUP-2 on some dozen or so aircraft carriers in both the 6th and 7th fleets. A lot of the time we were restricted in where/how we were allowed to fly because of a history of problems with the R-975 engine. Not much power but enough to enable me to rescue a number of downed pilots while flying plane guard. My only problems were an engine that oversped by itself while on the carrier deck in Hong Kong and a partial engine failure that almost sent me into the Pacific. Easy to fly.

William Fury, e-mail, 06.11.2010

Flew the HUPs at HTG ellyson Fld P Cola Did a lot of D1s (First Solos ) even though I was in the HO4S/HRS Division !1958/59 Was a AD2 at 19yrs old ,Right from the Fleet HS-4,/HS-8 Flying the HSS-1s I Got a Kick out of the Porpusing the HUP Did ! Good A/C! 1955/1998 Retired

Jerry Stone, e-mail, 31.07.2010

I wasa a flight test engineer on the HUP-1 in 1949 and 1950. Jim Ryan was the chief test pilot. Other engineer included Les Kravitz, Joe Reich annd Chris Christadolou. It was a fun time. Anybody remember....

Rich, e-mail, 08.07.2010

Hi Shipmates! As an ADR2 was an rescue air-crewman on many of the HUP's and other helos of the day. 1962-1964 at the utility squadron HU-1 Ream Field, Calif. Had a lot of training in and out of the ocean at Imperial Beach. Made numerous shot cruises as air sea rescue crewman and then went as attachment on a WestPac for 10 months. I wish I was in that shape again. Haven't seen a real HUP after getting out in 1964. Thanks for your service. St.Louis, Mo. area Rich

RONALD MCNEESE, e-mail, 09.03.2010

SPENT 13 MONTHS 23DAYS AND 4 HOURS AS A HOSPITAL CORPSMAN FLYING OUT OF ADAK ALASKA, TIME SPENT WITH THE HUP-1 WAS APRIL 1956 TILL MAY 1957. I CAN NOT REMEMBER ANY TIME THE OLD HUP WAS NOT READY AS NEEDED. LUCKEY WE NEVER HAD TO VENTURE FAR FROM BASE WITH THE LOUSY WEATHER.

ROBERT V. CANTO, e-mail, 05.02.2010

I WAS A CREW MEMBER ON THIS TYPE OF HELO FROM 1956-1959.
Air-sea rescue aboard various carries in the Pacific Fleet.
Made two rescues at sea in that type. I was attached to HU-1 IN SAN DEIGO.

Wayne LaDuke, e-mail, 11.01.2010

In my last comment a portion didn't print. A HUP is also located in the museum at NAS Cory Field Pensacola Fl.Thank you.

Wayne LaDuke, e-mail, 11.01.2010

I flew with HUP helicopter at Rheem Field Imperial Beach Ca. with HU-1 at NAS Rheem Field Imperial Beach Ca. from Aug 1958 to June 1959 when I was discharged as AD-2.I flew as a crewman.As of now I know there is a HUP at the MCAS at Miramar Ca in the museum.Also there is a HUP in the museum.I would like to hear from anybody that was stationed in Imperial Beach Ca with HU-1 During 1958 and 1959.

joe, e-mail, 25.10.2009

A friend was surfing in costa rica and brought me a picture of a hup he saw in a field

Marino L. DiLeo, e-mail, 19.03.2008

We just recieved our HUP-2 which I flew as co-pilot out of HU-2 1955-57 alsoaboard the USS Intrepid CVA11. If you have any tech manuals I could use them. ADR2 (Ret) I have pictures also of the HRS-3.

Jay, e-mail, 05.12.2006

About 2001, there remained an old hulk of a Retriever behind an A&P school, north of the Indianapolis Inter. Airport. These things pop up like toadstools after a rain. You can't tell where the next one will be.

Do you have any comments concerning this aircraft ?

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FACTS AND FIGURES

© The Piasecki Aircraft Corp. of Morton, Pennsylvania, evolved into today's Boeing Helicopter Company.

© The first US Navy HUPs were delivered to squadron HU-2 in February 1951.

© A Retriever could hover at 15m and lift an airman weighing 75kg.

© After being transferred to reserve units, some HUPs were retained as rescue aircraft with an orange colour scheme.

© PV-18 production totalled 339, including 70 H-25s for the US Army.

© The Army's H-25s were procured by the USAF on the Army's behalf.



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