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Bell X-14

Bell Aircraft · VTOL Research · USA · Early Jet (1946–1969)

Bell X-14 — VTOL Research
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The Bell X-14 (also designated Bell Type 68) was an open-cockpit experimental VTOL jet built by Bell Aircraft in 1957. A single airframe was built; it served NASA from 1957 to 1981 as the longest-serving X-plane on record (24 years), training astronauts including Neil Armstrong on the throttle-and-vector handling skills they would later use to land lunar modules and the X-15 on the Rogers Dry Lake bed at Edwards.

The X-14 used vectored thrust: two Armstrong Siddeley Viper turbojets (later upgraded to General Electric J85s) mounted in the nose, with their exhaust ducted to a cascade of moveable diverter vanes amidships under the centre of gravity. Rotating the vanes between vertical and horizontal converted hovering thrust into forward thrust without changing the engine orientation. The configuration kept the airframe compact and let the pilot transition through the entire envelope using one set of controls — a contrast to tilt-rotor and tilt-wing alternatives that had to physically rotate engines or wings.

First flight was on 19 February 1957 with Bell test pilot David Howe. The X-14 transitioned from hover to forward flight on 24 May 1958 — only the second U.S. fixed-wing aircraft to complete a full vertical-takeoff, transition, level-flight, transition-back, vertical-landing cycle. NASA received the airframe in 1959 and used it as a generic VTOL handling-qualities trainer for two decades. Several future astronauts logged X-14 hours, including Neil Armstrong, who flew the aircraft as part of his Apollo 11 lunar-module-landing preparation.

The X-14 was rebuilt twice with progressively more powerful engines (X-14A, X-14B) and was finally damaged beyond economical repair in a hard landing on 29 May 1981. The airframe survives in private collection at the Ropkey Armor Museum in Indiana. Its real legacy is the fly-by-vector envelope data set that fed every U.S. tilt-rotor and lift-fan programme that followed, from the Bell XV-15 through the V-22 Osprey to the F-35B's lift fan.

For Kids — a shorter, friendlier version

The Bell X-14 was an open-cockpit experimental jet built in 1957. It was the longest-serving X-plane in history, used by NASA from 1957 until 1981 — 24 years in total. The plane could take off straight up like a helicopter and then fly forward like a regular jet.

The X-14 used a clever trick called vectored thrust. Two small jet engines in the nose blew hot gas through a set of moving vanes near the middle of the plane. By tilting the vanes, the pilot could aim the thrust straight down for hovering or backward for forward flight.

NASA used the X-14 to train astronauts. The plane handles much like a helicopter during hovering, which is how the lunar module landed on the Moon. Neil Armstrong and several Apollo astronauts practiced their lunar landings in the X-14 before going to the Moon.

Only one X-14 was built. The plane is smaller than most modern fighter jets, at only about 25 feet long. The X-14 was finally retired in 1981 after a crash that did not hurt anyone but damaged the plane beyond repair. The single airframe still exists in pieces today at a museum.

Fun Facts

  • The X-14 was the longest-serving X-plane in history at 24 years.
  • Neil Armstrong practiced lunar landings in an X-14 before going to the Moon.
  • The plane could take off straight up like a helicopter.
  • Only one X-14 was ever built.
  • It used vectored thrust — moving vanes that aimed the jet exhaust in different directions.
  • The X-14 was retired in 1981 after a crash damaged the plane beyond repair.

Kids’ Questions

Why did NASA use the X-14 to train astronauts?

Landing the Apollo Lunar Module on the Moon was very tricky because the spacecraft had to hover and slowly come down. The X-14 hovers in air just like the Lunar Module hovers in the Moon's weaker gravity. Practicing in the X-14 taught astronauts the throttle-and-vector skills they needed for a safe Moon landing.

What is an X-plane?

X-planes are American experimental research planes built to test new ideas in flight. The first X-plane was the X-1, which was the first plane to break the sound barrier in 1947. Since then, the United States has built and flown more than 60 different X-planes, each one testing something new.

Variants

X-14 / X-14A / X-14B
Single airframe (s/n 56-4022), progressively re-engined: original Armstrong Siddeley Viper turbojets (X-14, 1957), General Electric J85-GE-5 (X-14A, 1959), J85-GE-19 (X-14B, 1971). Damaged beyond repair 29 May 1981.

Notable Operators

NASA Ames Research Center
Operated the X-14 from 1959 to 1981. Used the airframe as a generic VTOL handling-qualities trainer; pilots logged thousands of hover hours preparing for lunar-module operations and follow-on V/STOL programmes.
United States Air Force
Funded the original 1955 contract and conducted the early flight envelope expansion (1957-1959) before transferring the airframe to NASA Ames.

Frequently Asked Questions

Did Neil Armstrong fly the Bell X-14?

Yes — Armstrong flew the X-14 as part of his Apollo 11 preparation, using it to practise the throttle-and-vector control technique he would need to land Eagle on the Moon. The Lunar Landing Research Vehicle (LLRV / LLTV) was the more direct simulator, but the X-14 was used to build VTOL handling-quality intuition first.

What is vectored thrust?

A propulsion arrangement where the engine exhaust direction can be rotated relative to the airframe — usually via deflector vanes downstream of the engine, or by physically swivelling the nozzle. The X-14 used cascade vanes under the fuselage; modern aircraft like the F-35B use a swivelling rear nozzle and a separate lift fan.

How long did the X-14 fly?

24 years (1957-1981) — the longest active service of any X-plane. Total flight count exceeded 1,500. The airframe was rebuilt twice with more powerful engines (X-14A, X-14B) before its final hard landing in May 1981.

Where is the Bell X-14 today?

In private collection at the Ropkey Armor Museum in Crawfordsville, Indiana. The airframe is unrestored and the canopy/instrumentation are largely intact (NASA Ames fact sheet).

How did the X-14 differ from the V-22 Osprey?

The X-14 deflected jet exhaust through cascade vanes while keeping engines horizontal. The V-22 Osprey physically rotates its prop-rotors and engines together via tilt-nacelles. Both achieve VTOL transition, but tilt-rotor preserves much higher cruise efficiency than vectored-jet at the cost of mechanical complexity.

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