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Piasecki H-16 Transporter

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H-16 / PV-15 Transporter
The US Air Force prototype Piasecki YH-16A Transporter.
General information
Type	Tandem-rotor transport helicopter
National origin	United States
Manufacturer	Piasecki Helicopter
Number built	2
History
First flight	23 October 1953

ThePiasecki H-16 Transporter (company designationPV-15) was atandem-rotor transport or rescue helicopter designed byFrank Piasecki and built byPiasecki Helicopter. The prototypes were evaluated by theUnited States Air Force andArmy, but the crash of the second test aircraft led to cancelling the project.

Design and development

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Given the company designation PV-15, the tandem-rotor helicopter was designed by company founder Frank Piasecki.^[1] The design was publicly shown for the first time on 15 September 1953 at thePhiladelphia airport.^[2]

Operational history

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Crash

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On 5 January 1956, the second YH-16 test aircraft crashed while returning to Philadelphia from a test flight over New Jersey.^[3] The cause of the crash was later determined to be the aftslip ring, which carried flight data from the instrumented rotor blades to the data recorders in the cabin. The slip ring bearings seized, and the resultant torque load severed the instrumentation standpipe inside the aft rotor shaft. A segment of this steel standpipe tilted over and came into contact with the interior of the aluminum rotor shaft, scribing a deepening groove into it. The rotor shaft eventually failed in flight, which in turn led to the aft blades and forward blades desynchronizing and colliding.

The aircraft was a total loss; the two test pilots, Harold Peterson and George Callahan, were killed. This led to the cancellation not only of the YH-16, but also the planned 69-passenger YH-16B version.^[4]

Variants

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Another view of the first YH-16A prototype

XH-16/YH-16: Powered by twoPratt & Whitney R-2180-E Twin Wasp E radial engines and room for 43 troops, one built later converted to a YH-16B.^[4]
YH-16A: Powered by twoAllison T38-A-10 1,800 shpturboshaft engines; previously designatedXH-27.^[4]
YH-16B: Prototype XH-16A re-engined with twoAllison T56-A-5 2,100 shp turboshaft engines.^[4]

Specifications (YH-16B)

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3-view line drawing of the Piasecki H-16A Transporter

Data fromU.S. Army Aircraft Since 1947^[5]

General characteristics

Crew: 3 (2 pilots and flight engineer^[6])
Capacity: 47 troopsor 38 stretchers and 5 attendants
Length: 77 ft 7 in (23.65 m)
Height: 25 ft 0 in (7.62 m)
Empty weight: 25,450 lb (11,544 kg)
Gross weight: 45,700 lb (20,729 kg)
Powerplant: 2 ×Allison T56-A-5 turboshafts, 2,100 shp (1,600 kW) each
Main rotor diameter: 2 × 82 ft (25 m)
Main rotor area: 10,562 sq ft (981.2 m²)

Performance

Maximum speed: 156 mph (251 km/h, 136 kn)
Cruise speed: 125 mph (201 km/h, 109 kn)
Range: 216 mi (348 km, 188 nmi)
Service ceiling: 15,600 ft (4,800 m)

References

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^"Have You Seen?: Monster 'Copter".Flying. Vol. 54, no. 1. January 1954. p. 41.
^Associated Press, "Ready To Pick Up And Go",San Bernardino Daily Sun, San Bernardino, California, Thursday 16 September 1953, Volume LX, Number 14, page 14.
^Piasecki Helicopter Corporation newsletter, January 1956
^^a ^b ^c ^dHarding, Stephen (1997).U.S. Army Aircraft Since 1947. Atglen, PA, USA: Schiffer Publishing Ltd. pp. 202.ISBN 076430190X.LCCN 96-69996.
^Harding 1990, p. 264.
^Bridgman 1955, pp. 302–303.

Bridgman, Leonard (1955).Jane's All The World's Aircraft 1955–56. New York: The McGraw-Hill Book Company.
Harding, Stephen (1997).U.S. Army Aircraft Since 1947. Shrewsbury, UK: Airlife Publishing Ltd.ISBN 1-85310-102-8.

External links

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Wikimedia Commons has media related toPiasecki H-16 Transporter.

Piasecki H-16 page
"Biggest Transport Helicopter Cruises 150 Miles Per Hour."Popular Mechanics, January 1954, p. 119, bottom of page.

v t e Piasecki Helicopter, Vertol, andBoeing Rotorcraft Systems model numbers
1 2 3 11 12 14 15 17 18 21 22 26 29 32 34 42 43 44 45 47 49 51 63 71 76 82 90 105 107 114 119 129 137 141 143 145 147 150 157 160 165 166 167 173 176 177 179 180 210 213 215 216 219 222 227 234 235 237 297 298 299 301 307 308 309 340 347 352 360 414

v t e Piasecki Helicopter/Vertol/Piasecki Aircraft
Piasecki/Vertol helicopters	PV-2 PV-3/HRP Rescuer PV-14 Retriever PV-15 Transporter PV-17 Rescuer H-16 Transporter H-21 H-25/HUP Retriever VZ-2
Piasecki Aircraft	PA-2B 16H Pathfinder PA-39 VZ-8/PA-59 Airgeep PA-97 X-49 PA-890

United Stateshelicopter designations, Army/Air Force andTri-Service systems

Numerical sequence used by USAAC/USAAF/USAF 1941–present;U.S. Army 1948–1956 and 1962–present;U.S. Navy 1962–present

Army/Air Force sequence
(1941–1962)

Prefix R-, 1941–1948	R-1 R-2 R-3 R-4 R-5 R-6 R-7 R-8 R-9 R-10 R-11 R-12 R-13 R-14 R-15 R-16
Prefix H-, 1948–1962	H-5 H-6 H-9 H-10 H-11 H-12 H-13 H-13J H-15 H-16 H-17 H-18 H-19 H-20 H-21 H-22 H-23 H-24 H-25 H-26 H-27 H-28 H-29 H-30 H-31 H-32 H-33 H-34 H-35 H-36¹ H-37 H-38¹ H-39 H-40 H-41 H-42 H-43 H-44¹ H-45¹

Tri-Service sequence
(1962–present)

1962 redesignations	H-13 H-13F H-13J H-19 H-21 H-23 H-25 H-34 H-37 H-43
New designations	H-46 H-47 H-48 H-49 H-50 H-51 H-52 H-53 CH-53/E/K HH-53/MH-53 H-54 H-55 H-56 H-57 H-58 H-59 H-60 UH-60 SH-60 HH-60 MH-60 H-61 H-62 H-63 H-64 H-65 H-66² RAH-66 TH-66 H-67 H-68 H-69¹ H-70 H-71 H-72 H-73
Alternate sequence	H-1 AH-1/J/T/W/Z UH-1/N/Y H-2 H-2G H-3 CH-3/HH-3 SH-3 H-4 H-5 H-6 AH-6 MH-6 OH-6
Non-sequential	H-90 H-92 CH-92/VH-92 H-101 H-139