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aeronewsline :: Accueil :: Histoire :: Aéronefs 1956 à 1965
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Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 12:50
Le LTV XC 142 sur Wikipedia de langue anglaise :
[Vous devez être inscrit et connecté pour voir ce lien]
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The [Vous devez être inscrit et connecté pour voir ce lien] (LTV) XC-142 is a [Vous devez être inscrit et connecté pour voir ce lien] designed to investigate the operational suitability of vertical/short takeoff and landing transports.
An XC-142A first flew conventionally on September 29, 1964, and on January 11, 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.
[Vous devez être inscrit et connecté pour voir ce lien]
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The [Vous devez être inscrit et connecté pour voir ce lien] (LTV) XC-142 is a [Vous devez être inscrit et connecté pour voir ce lien] designed to investigate the operational suitability of vertical/short takeoff and landing transports.
An XC-142A first flew conventionally on September 29, 1964, and on January 11, 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.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 12:54
History
In 1959 the [Vous devez être inscrit et connecté pour voir ce lien], Navy and Air Force began work on the development of a prototype V/STOL airplane 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 [Vous devez être inscrit et connecté pour voir ce lien], from further offshore.
In 1959 the [Vous devez être inscrit et connecté pour voir ce lien], Navy and Air Force began work on the development of a prototype V/STOL airplane 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 [Vous devez être inscrit et connecté pour voir ce lien], from further offshore.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 12:56
The original outline had been drawn up as a replacement for the [Vous devez être inscrit et connecté pour voir ce lien], with a payload on the order of
10,000 lb (5,000 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).
10,000 lb (5,000 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).
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 12:58
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.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 12:59
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 [Vous devez être inscrit et connecté pour voir ce lien] this naming was dropped.
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 [Vous devez être inscrit et connecté pour voir ce lien] this naming was dropped.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 13:00
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.
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.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 13:01
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-142A's were flown by 39 different military and civilian pilots.
Tests included carrier operations, simulated rescues, paratroop drops, and low-level cargo extraction.
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-142A's were flown by 39 different military and civilian pilots.
Tests included carrier operations, simulated rescues, paratroop drops, and low-level cargo extraction.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 13:03
During testing the aircraft's cross-linked drive shaft proved to be its [Vous devez être inscrit et connecté pour voir ce lien].
The shaft resulted in excessive vibration and noise, resulting in a high pilot workload.
Additionally, it proved susceptible to problem 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.
The shaft resulted in excessive vibration and noise, resulting in a high pilot workload.
Additionally, it proved susceptible to problem 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.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 13:05
One of the limitations found in the plane 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.
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.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 13:06
Nevertheless the aircraft did seem to be successful for a prototype.
In 1966, while the tests were still being performed, the Air Force requested a proposal for a production version, the C-142B.
Since the Navy had backed out by this time, a major improvement was proposed to eliminate the Navy carrier compatibility requirement, which could dramatically reduce the empty weight.
Other changes proposed for this version included a streamlined cockpit, larger fuselage, upgraded engines and simplified engine maintenance.
In 1966, while the tests were still being performed, the Air Force requested a proposal for a production version, the C-142B.
Since the Navy had backed out by this time, a major improvement was proposed to eliminate the Navy carrier compatibility requirement, which could dramatically reduce the empty weight.
Other changes proposed for this version included a streamlined cockpit, larger fuselage, upgraded engines and simplified engine maintenance.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 13:09
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 the [Vous devez être inscrit et connecté pour voir ce lien] for research testing from May 1966 to May 1970.
XC-142A testing ended and the remaining flying copy was turned over to the [Vous devez être inscrit et connecté pour voir ce lien] for research testing from May 1966 to May 1970.
Ydel- CLUB
- Messages : 764
Re: Ling-Temco-Vought XC-142
par Ydel Ven 16 Juil 2010, 13:10
A civilianised 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.
This was designed to carry 40-50 passengers at a cruise speed of 290 mph (470 km/h) using only two of its engines.
Ydel- CLUB
- Messages : 764
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