digplanet beta 1: Athena
Share digplanet:

Agriculture

Applied sciences

Arts

Belief

Business

Chronology

Culture

Education

Environment

Geography

Health

History

Humanities

Language

Law

Life

Mathematics

Nature

People

Politics

Science

Society

Technology

XC-142
Ling-Temco-Vought XC-142A.jpg
Role Experimental VTOL transport
Manufacturer Ling-Temco-Vought (LTV)
First flight 29 September 1964
Primary user NASA
Number built 5

The Ling-Temco-Vought (LTV) XC-142 is a tiltwing experimental aircraft designed to investigate the operational suitability of vertical/short takeoff and landing transports. An XC-142A first flew conventionally on 29 September 1964, and on 11 January 1965, it completed its first transitional flight by taking off vertically, changing to forward flight and finally landing vertically. Its participants pulled out of the program one-by-one and it eventually ended due to a lack of interest after demonstrating its capabilities successfully.

Development[edit]

In 1959 the United States Army, Navy and Air Force began work on the development of a prototype V/STOL aircraft that could augment helicopters in transport-type missions. Specifically they were interested in designs with longer range and higher speeds than existing helicopters, in order to support operations over longer distances, or in the case of the United States Marine Corps, from further offshore. On 27 January 1961, a series of DOD actions resulted in an agreement where all of the military arms would work on such a project under the overall leadership of the Navy's Bureau of Naval Weapons (BuWeps), the Tri-Service Assault Transport Program.

The original outline had been drawn up as a replacement for the Sikorsky HR2S, with a payload on the order of 10000 lb (4500 kg). BuWeps released a revised specification that specified the same payload, but extended the operational radius to 250 miles (400 km) and increased the cruising airspeed to 250–300 knots (460–560 km/h) and the maximum airspeed to 300–400 knots (560–740 km/h). However, for the Marine Corps mission, the requirement stated that the fuel load could be reduced so that the maximum gross weight would not exceed 35,000 pounds (16,000 kg), as long as a 100-nautical-mile (190 km) radius was maintained.

Vought responded with a proposal combining engineering from their own design arm, as well as Ryan and Hiller, who had more extensive helicopter experience. Their proposal won the design contest, and a contract for five prototypes was signed in early 1962 with first flight specified for July 1964. The design was initially known as the Vought-Ryan-Hiller XC-142, but when Vought became part of the LTV conglomerate this naming was dropped.

During the prototype development the Navy decided to exit the program. They were concerned that the strong propeller downwash would make it difficult to operate. Their existing HR2S fleet had a ground pressure of about 7.5 psi (500 hPa), and proved to blow people about on the ground and stir up considerable amounts of debris. The C-142 was predicted to have an even higher loading of 10 psi (700 hPa), which they believed would limit it to operations to and from prepared landing pads and was therefore unsuitable for assault operations.

The first prototype made its first conventional flight on 29 September 1964, first hover on 29 December 1964, and first transition on 11 January 1965. The first XC-142A was delivered to the Air Force test team in July 1965. During the XC-142A program, a total of 420 hours were flown in 488 flights. The five XC-142As were flown by 39 different military and civilian pilots. Tests included carrier operations, simulated rescues, paratroop drops, and low-level cargo extraction.

During testing the aircraft's cross-linked drive shaft proved to be its Achilles heel. The shaft resulted in excessive vibration and noise, resulting in a high pilot workload. Additionally, it proved susceptible to problems due to wing flexing. Shaft problems, along with operator errors, resulted in a number of hard landings causing damage. One crash occurred as a result of a failure of the drive shaft to the tail rotor, causing three fatalities. One of the limitations found in the aircraft was an instability between wing angles of 35 and 80 degrees, encountered at extremely low altitudes. There were also high side forces which resulted from yaw and weak propeller blade pitch angle controls. The new "2FF" propellers also proved to generate less thrust than predicted.

Design[edit]

XC-142A at the National Museum of the U.S. Air Force

The basic design was fairly typical for a cargo aircraft, consisting of a large boxy fuselage with a tilted rear area featuring a loading ramp. It had a wingspan of 67 ft (20 m) and was 58 ft (18 m) long overall. The fuselage housed a 30 ft (9.1 m) long, 7.5 ft (2.3 m) wide 7 ft (2.1 m) high cargo area with a somewhat boxy cockpit on the front for the crew of two pilots and a loadmaster. The wing was high-mounted and the tail surfaces were a "semi-T-tail" to keep the rear area clear during loading. Tricycle landing gear were used, with the main legs retracting into blisters on the fuselage sides. In normal parked configuration it would appear to be a conventional cargo plane.

For S/VTOL operations, the aircraft "converted" by tilting its wing to the vertical. Roll control during hover was provided by differential clutching of the propellers, while yaw used the ailerons, which were in the airflow. For pitch control the aircraft featured a separate tail rotor, oriented horizontally to lift the tail, as opposed to the more conventional anti-torque rotors on helicopters that are mounted vertically. When on the ground, the tail rotor folded against the tail to avoid being damaged during loading. The wing could be rotated to 100 degrees, past vertical, in order to hover in a tailwind.

The C-142 was powered by four General Electric T64 turboshaft engines cross-linked on a common drive-shaft to drive four 15.5-foot (4.7 m) Hamilton Standard fiberglass propellers which eliminated engine-out asymmetric thrust problems during VTOL operations. Compared to conventional designs it was overpowered: it had 0.27 hp/lb, compared to 0.12 hp/lb for the contemporary Lockheed C-130D Hercules. This extra power was required for safe VTOL operations, and gave the aircraft excellent all-around performance which included a maximum speed of over 400 mph (640 km/h), making it one of the fastest VTOL transport aircraft of the era.

Operational history[edit]

The XC-142 during trials aboard USS Bennington (CVS-20), in 1966.

Nevertheless the aircraft never proceeded beyond the prototype stage. In 1966, while tests were still underway, the Air Force requested a proposal for a production version, the C-142B. Since the Navy had backed out by this time, the Navy carrier compatibility requirement could be eliminated which dramatically reduced the empty weight. Other changes proposed for this version included a streamlined cockpit, larger fuselage, upgraded engines and simplified engine maintenance.

After reviewing the C-142B proposal, the tri-services management team could not develop a requirement for a V/STOL transport. XC-142A testing ended and the remaining flying copy was turned over to NASA for research testing from May 1966 to May 1970.

In service it would carry 32 equipped troops or 8,000 pounds (4,000 kg) of cargo. It had maximum gross weight of 41,000 pounds (19,000 kg) for a vertical take-off, or 45,000 pounds (20,000 kg) for a short takeoff. A civilian version, the Downtowner, was also proposed. This was designed to carry 40-50 passengers at a cruise speed of 290 mph (470 km/h) using only two of its engines.[1]

Survivors[edit]

Of the five aircraft built, only one still survives.

Specifications (XC-142A)[edit]

Data from Jane's All The World's Aircraft 1965–66[2]

General characteristics

Performance

See also[edit]

Aircraft of comparable role, configuration and era
Related lists

References[edit]

Notes
  1. ^ McPhee, Andrew. "Beating Gravity: Vought-Hiller-Ryan XC-142A." unrealaircraft.com, 2005. Retrieved: 15 November 2010.
  2. ^ Taylor 1965, pp. 264–265.
Bibliography
  • Markman, Steve and William G. Holder. Straight Up A History of Vertical Flight. Atglen, PA: Schiffer Publications, 2000. ISBN 0-7643-1204-9.
  • Taylor, John W. R. Jane's All The World's Aircraft 1965–1966. London: Sampson Low, Marston & Company, 1965.

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/LTV_XC-142 — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
531 videos foundNext > 

XC-142A Tilt-Wing Cargo Aircraft Expanded the Envelope in the 1960s

The LTV XC-142A was a remarkable demonstration of tilt-wing design that enabled this four-engine transport to take off and land vertically. First flight was ...

XC-142 VTOL Test Aircraft

Ling-Temco-Vought (LTV) XC-142 was a tiltwing experimental aircraft designed for VTOL and a forerunner to the modern Osprey. The XC-142 first flew in Septemb...

Scale Flying Model of XC-142 VTOL

The XC-142 is a stand-off scale model of a full scale VTOL transport. Five full scale aircraft were built in the 1960s and evaluated in various roles. Despit...

Ling-Temco-Vought (LTV) XC-142

The Ling-Temco-Vought (LTV) XC-142 is a tiltwing experimental aircraft designed to investigate the operational suitability of vertical/short takeoff and land...

Ling-Temco-Vought (LTV) XC-142

The Ling-Temco-Vought (LTV) XC-142 is a tiltwing experimental aircraft designed to investigate the operational suitability of vertical/short takeoff and land...

Ling Temco Vought LTV XC 142

( Must watch these 2 links ) https://www.youtube.com/user/Adsense2015 https://www.facebook.com/Adsense2015.

ONE OF A KIND us air force XC 142 VTOL Aircraft

An interesting VTOL aircraft for the us air force and military. The Ling-Temco-Vought (LTV) XC-142 is a tiltwing experimental aircraft designed to investigat...

XC-142 Tiltwing Experimental Aircraft (1964)

The Ling-Temco-Vought (LTV) XC-142 is a tiltwing experimental aircraft designed to investigate the operational suitability of vertical/short takeoff and land...

XC 142 A LTV (Hiller Ryan) indoor RC

XC 142 A LTV indoor RC.

Largest and Heaviest XC-142 S/VTOL Short/Vertical Take Off and Landing on an Aircraft Carrier -1964

Largest and Heaviest XC-142 S/VTOL Short / Vertical Take Off and Landing on an aircraft Carrier -1964 XC-142 A four-engines tilt wing 40000 pound transport ...

531 videos foundNext > 

15 news items

 
Gizmodo
Wed, 18 Jun 2014 08:56:15 -0700

The Ling-Temco-Vought (LTV) XC-142 experimental aircraft was originally developed as both a replacement to the US military's aging fleet of Sikorsky HR2S transport helicopters and as a prototype testbed for exploring the possibility of VTOL (Vertical ...
 
Gizmodo Australia
Thu, 19 Jun 2014 01:01:39 -0700

The Ling-Temco-Vought (LTV) XC-142 experimental aircraft was originally developed as both a replacement to the US military's ageing fleet of Sikorsky HR2S transport helicopters and as a prototype testbed for exploring the possibility of VTOL (Vertical ...

Donna Glamour

Donna Glamour
Mon, 29 Sep 2014 00:32:15 -0700

Il 29 settembre del 1964 ci fu il primo volo convenzionale del convertiplano Ling-Temco-Vought XC-142. Il Ling-Temco-Vought (LTV) XC-142 era un convertiplano a quattro rotori basculanti realizzato dall'azienda statunitense Ling-Temco-Vought negli anni ...
 
Aero-News Network
Tue, 15 Apr 2008 21:10:51 -0700

From 1965 to 1972 Rutan worked for the US Air Force at Edwards Air Force Base as a flight test project engineer, working on nine separate projects including fighter spin tests and the LTV XC-142 VSTOL transport. Shortly after, he became director of the ...
 
Flightglobal
Fri, 12 Jun 2009 02:13:46 -0700

The ACCA is also perhaps the first airlifter in the X-plane series since the LTV XC-142 tiltwing in 1964. The fact that nearly four decades have passed since the last experimental airlifter project is more than a nostalgic memory. It is also a reminder ...
 
Фраза - ежедневные новости и аналитика
Sat, 19 Jul 2014 14:00:00 -0700

Вертикально взлетающий. LTV XC-142 — американский экспериментальный транспортный самолет вертикального взлета и посадки с поворотным крылом. Совершил первый полёт 29 сентября 1964 года. Построено пять самолетов. Программа ...
 
Soha
Wed, 30 Jul 2014 02:24:10 -0700

Trực thăng lai máy bay LTV XC-142, tiền thân của "quái vật" V-22 Osprey do Mỹ chế tạo. Khả năng kết hợp giữa các cánh và động cơ không hoàn hảo khiến máy bay hoạt động kém hiệu quả. Nó bị loại khỏi biên chế nhưng trở thành hình mẫu để Mỹ chế tạo ...
 
TUT.BY
Wed, 22 Jan 2014 01:23:36 -0800

LTV XC-142 — американский экспериментальный транспортный самолет вертикального взлета и посадки с поворотным крылом. Совершил первый полёт 29 сентября 1964 года. Построено пять самолетов. Программа прекращена в 1970 году.
Loading

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight