Beechcraft QU-22 Pave Eagle
Optionally-piloted Bonanza derivative used for radio relay in Vietnam.
The Beechcraft QU-22 Pave Eagle was an American aircraft designed to serve as an optionally piloted radio relay platform, built on the foundation of the Beechcraft Bonanza. It was created to take over the role of the Lockheed EC-121R Batcat, which required a crew of 15 and proved too expensive. The QU-22 saw brief service with the United States Air Force during the Vietnam War, from 1968 to 1972.
The project began with the YQU-22A Pave Eagle I, a modified Model E33A Bonanza intended for Operation Igloo White. It was powered by a Continental TSIO-520-D engine and fitted with tip tanks, and could fly without a pilot. However, this version proved inadequate, so Beechcraft secretly developed an improved model, the QU-22B Pave Eagle II, based on the Model A36 Bonanza. The QU-22B used a 375 hp Continental GTSIO-520-G engine—a model not recorded by Teledyne Continental Motors—and a custom propeller combining blades from a Mitsubishi MU-2 with a unique hub, driven by a reduction gearbox to lower noise. An AiResearch turbocharger, which the company said came from a semi truck, was also fitted. The aircraft carried deicing boots, a sensor array, and remote-control equipment, all powered by a large generator mounted atop the engine. Although based on the Bonanza, the QU-22B used the wing spar and landing gear from the Beechcraft Baron. Its pilot’s operating handbook listed a maximum gross weight of 5,800 lb, far above the later G36 Bonanza’s 3,650 lb. With tip tanks, it could hold 220 US gallons of fuel, compared to the G36’s 74. Explosive bolts in the wings allowed the aircraft to self-destruct if control was lost during unmanned flight.
In 1970, Beechcraft also developed a low-cost close air support variant, the YAU-22A, for the Air Force’s Pave COIN program. It used the fuselage of a Model A36 Bonanza, wings from a Model 95-B55 Baron, and a 350 hp Continental GTSIO-520 engine. The YAU-22A competed against the Fairchild AU-23A Peacemaker, Helio AU-24 Stallion, and Piper PA-48 Enforcer. The Air Force initially selected it, but flight tests showed it was underpowered and unsafe to fly with weapons. Only one prototype was built before the program was canceled in 1972.
The YQU-22A was evaluated by the 553rd Reconnaissance Wing at Nakhon Phanom Airport from December 1968 to August 1969. Two aircraft were lost in combat.
Quick Facts
- National Origin
- United States
- Manufacturer
- Beechcraft
- Introduction
- 1968
- Retired
- 1972
- Primary User
- United States Air Force
- Number Built
- 34
- Developed From
- Beechcraft Bonanza
Facts from the source article.
Lore & Background
The YQU-22A Pave Eagle I was conceived during the Vietnam War as a replacement for the Lockheed EC-121R Batcat in the Operation Igloo White mission. The Batcat, based on the Lockheed L-1049 Super Constellation, proved expensive and required a crew of 15, prompting the Air Force to order a new aircraft based on the Beechcraft Bonanza. The Pave Eagle I was a modified Model E33A Bonanza capable of unmanned flight, powered by a Continental TSIO-520-D engine and fitted with tip tanks. The YQU-22A proved inadequate, so Beechcraft built an improved version in secret as the QU-22B Pave Eagle II, based on the Model A36 Bonanza. The QU-22B used a geared 375 hp Continental GTSIO-520-G engine driving a custom propeller combining blades from a Mitsubishi MU-2 with a custom hub, driven by a reduction gearbox to reduce noise. The engine also had a turbocharger from AiResearch, which the company claimed belonged to a semi truck. The QU-22B featured deicing boots, a sensor array, remote control equipment, a large generator atop the engine, and explosive bolts in the wings for self-destruction if control was lost. Though based on the Bonanza, it used the wing spar and landing gear of the Beechcraft Baron. The pilot's operating handbook specified a maximum gross weight of 5800 lb, considerably higher than the later G36 Bonanza's 3650 lb. With tip tanks, the QU-22B could carry 220 USgal of fuel, compared to 74 USgal in the G36. Beechcraft also developed a low-cost close air support variant in 1970 as the YAU-22A, using the fuselage of a Model A36 Bonanza, wings of a Model 95-B55 Baron, and a 350 hp Continental GTSIO-520 engine. It competed in the Air Force's Pave COIN program against the Fairchild AU-23A Peacemaker, Helio AU-24 Stallion, and Piper PA-48 Enforcer. Although initially chosen, flight testing revealed it underpowered and unsafe with weapons; only one prototype was built before cancellation in 1972.
Reader's Guide
The QU-22 Pave Eagle represents an early attempt to field an optionally-piloted aircraft for persistent surveillance and relay missions. Its development was driven by the high cost and crew requirements of the EC-121R Batcat in Operation Igloo White. The QU-22B was almost always flown with a pilot due to the impracticality of unmanned missions, and pilots disliked its large cowling hump, which induced vertigo and blocked view. They regularly flew at 6400 lb, exceeding the handbook's maximum gross weight. The aircraft flew Compass Flag missions listening to North Vietnamese Army communications, with a 'big black box' handcuffed to the pilot's wrist. Of 27 QU-22Bs built, six were lost in Vietnam, none due to ground fire, claiming two pilots' lives. Four crashes were attributed to engine failures. The program was canceled in 1972, replaced by the Lockheed EC-130 for Compass Flag. A declassified 1971 RAND report recommended 24 YQU-22A aircraft for a South Vietnamese border security program. The QU-22's legacy is that of a technically ambitious but operationally troubled platform that foreshadowed later unmanned systems, yet remained largely dependent on pilots in practice.
Did You Know?
- Pilots regularly flew the QU-22B at 6400 lb, exceeding the handbook's maximum gross weight of 5800 lb.
- Six QU-22Bs were lost in Vietnam, none due to ground fire; four crashes were attributed to engine failures.
Frequently Asked Questions
What is the Beechcraft QU-22 Pave Eagle?
It was an American optionally-piloted radio relay aircraft built on a Beechcraft Bonanza airframe, operated by the U.S. Air Force during the Vietnam War from 1968 to 1972.
What role did the QU-22 Pave Eagle perform?
The aircraft acted as an airborne radio relay platform, broadcasting guidance signals to weapons and sensors on the ground. Its optionally-piloted design meant it could fly the mission without a crew aboard.
Why was the QU-22 Pave Eagle developed?
The Air Force needed a far cheaper replacement for the Lockheed EC-121R Batcat, which required a crew of fifteen and was prohibitively costly to run. Shrinking the mission down to a single-engine Bonanza derivative solved that budget problem.
How many QU-22 Pave Eagles were built and when did the type retire?
A total of 27 QU-22Bs, 6 YQU-22As, and 1 YAU-22A were produced, with the first YQU-22A evaluation flight occurring in 1968. The entire fleet was retired by 1972 after roughly four years of Vietnam War service.
What was the QU-22 Pave Eagle based on?
The airframe was a modified Beechcraft Model E33A Bonanza equipped with a Continental TSIO-520-D engine and wingtip fuel tanks for extended endurance. The initial YQU-22A variant was tailored specifically for the Operation Igloo White sensor-guidance program.
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