XC-142
Ling-Temco-Vought (LTV) · Experimental V/STOL transport · United States · Early Jet (1946–1969)
The LTV XC-142 was a four-engine tilt-wing V/STOL transport aircraft built by Ling-Temco-Vought (later Vought) between 1962 and 1965 for a joint U.S. Army / Navy / Air Force / NASA evaluation programme. Five XC-142A airframes were built; first flight was on 29 September 1964. The XC-142 was the first tilt-wing aircraft to demonstrate the full hover-to-cruise transition envelope at production-relevant scale. None entered production — the U.S. military declined to commit to V/STOL transport at the time, and one airframe survives at the National Museum of the United States Air Force.
The configuration was a 67-ft wingspan high-wing transport with the entire wing rotating up to 100° between cruise (0°) and hover (90°), driven by a hydraulic actuator behind the cockpit. Power came from four General Electric T64 turboshafts (3,080 shp each) cross-shafted so any engine could drive any of the four propeller positions if one or more failed. The cargo hold could carry 32 troops or 8,000 lb of cargo; ramp loading from the rear allowed roll-on/roll-off with armoured vehicles up to jeep-class.
The XC-142 demonstrated the full transition envelope — vertical takeoff, hover, transition to forward flight, cruise, transition back, vertical landing — and reached cruise speeds of 250 knots. The programme suffered three accidents, including a fatal crash of the third aircraft on 10 May 1967 that killed three crew. The cumulative loss rate was high enough that the joint-services evaluation board recommended against production. NASA continued flying the surviving airframe through 1970 as a generic V/STOL handling-qualities trainer; data from the programme fed into the later XV-15 and V-22 tilt-rotor programmes.
The single surviving XC-142A (s/n 62-5921) is on display at the National Museum of the United States Air Force at Wright-Patterson AFB, Ohio. The XC-142 is the largest piloted tilt-wing aircraft ever built; no production tilt-wing has emerged in the 60 years since, though tilt-rotor (V-22) and lift-fan (F-35B) configurations have ultimately filled the V/STOL niche the XC-142 was meant to occupy.
For Kids — a shorter, friendlier version
The LTV XC-142 was a very special plane built in the 1960s. It had four engines and a wing that could rotate. This let it take off straight up like a helicopter and then fly forward like a normal plane.
The wing could tilt all the way from flat to nearly straight up. When it pointed up, the propellers pushed the plane into the sky. Then the wing slowly rotated forward so the plane could cruise through the air. No other tilt-wing plane had ever done this full trick before.
The American Army, Navy, Air Force, and NASA all worked together on this project. Five of these planes were built between 1962 and 1965. The first flight happened on September 29, 1964.
Inside, the XC-142 could carry 32 soldiers or about 8,000 pounds of cargo. It had a ramp at the back so small vehicles could drive right in. The wingspan was 67 feet long — bigger than many school buses lined up end to end.
Only five were ever made, and none went into full use. Today, one surviving plane is on display at the National Museum of the United States Air Force, so kids can still see it!
Fun Facts
- The XC-142's wing could rotate a full 90 degrees to point the propellers straight up for takeoff.
- The plane had four engines, and they were all linked so one engine could help spin any propeller if another engine stopped working.
- The XC-142 was bigger than many school buses, with a wingspan of 67 feet.
- It was the very first tilt-wing aircraft to fly all the way from a hover to fast forward flight and back again.
- The cargo ramp at the back let small vehicles like jeeps drive straight into the plane.
- Five of these amazing planes were built, but none were ever put into regular service.
- The American Army, Navy, Air Force, and NASA all teamed up to test this one aircraft.
- One XC-142 still exists today and is kept safe in an air force museum for everyone to visit.
Kids’ Questions
How did the XC-142 take off without a runway?
The whole wing could tilt upward so the propellers pointed at the sky. This let the plane lift straight up, just like a helicopter. Then the wing slowly rotated forward so the plane could fly ahead like a normal aircraft.
Why was only one plane saved?
Five XC-142s were built, but they were test planes and were not made for regular use. Over time, some were damaged or worn out. One was kept and is now on display at the National Museum of the United States Air Force.
What could the XC-142 carry inside?
The XC-142 could carry up to 32 soldiers or about 8,000 pounds of cargo. It had a big ramp at the back so small vehicles could drive right in. That made loading and unloading fast and easy.
Variants
- XC-142A (5 airframes)
- First flight 29 September 1964. Five built. Three lost in flight accidents (one fatal); surviving airframe (s/n 62-5921) preserved at the National Museum of the USAF, Dayton, Ohio.
Notable Operators
- Joint US Army/Navy/Air Force/NASA evaluation
- Operated 1964-1968 from Edwards AFB. Pilots drawn from all four services plus NASA. The joint-services evaluation board declined to recommend production after the cumulative accident rate.
- NASA
- Continued to fly the surviving airframe 1968-1970 as a generic V/STOL handling-qualities research platform. Data fed into the later XV-15 and V-22 tilt-rotor programmes.
Frequently Asked Questions
What is a tilt-wing aircraft?
An aircraft where the entire wing rotates between vertical (hover) and horizontal (cruise). Tilt-wing differs from tilt-rotor (where only the engine rotates relative to a fixed wing) — the V-22 Osprey is a tilt-rotor; the XC-142 was a tilt-wing.
How many XC-142s were built?
Five XC-142A airframes between 1962 and 1965. Three were lost in accidents (one with three fatalities on 10 May 1967). Two survived the programme; one is on display at the National Museum of the USAF.
Why didn't the XC-142 enter production?
The cumulative accident rate during 1964-1968 evaluation was too high — three of five airframes lost. The joint-services board judged the airframe was not ready for production despite demonstrating the full V/STOL transition envelope. The U.S. military's V/STOL transport requirement was eventually filled by the much later V-22 Osprey tilt-rotor.
How fast did the XC-142 fly?
Cruise speed about 250 knots (290 mph / 460 km/h) in horizontal flight. Maximum hover-to-cruise transition speed was about 80 knots — faster than the helicopter alternatives of the era, slower than turboprop transports.
Where is the XC-142 today?
The single surviving airframe (s/n 62-5921) is on display at the National Museum of the United States Air Force at Wright-Patterson AFB, Ohio (museum site).
Sources
See Also
- Bell-Boeing V-22 Osprey — Successful production V/STOL transport (tilt-rotor)
- Bell XV-15 — Tilt-rotor research aircraft
- Bell X-22A — Sister V/STOL X-plane (ducted-fan)
- Bell X-14 — Earlier vectored-thrust VTOL research
- NASA GL-10 Greased Lightning — Modern small electric tilt-wing demonstrator