Beechcraft QU-22B Pave Eagle
The QU-22B Model was the production drone model for the USAF operation Pave Eagle. A total of 27 were built.
The Beechcraft QU-22 Pave Eagle was a Beech 36/A36 Bonanza modified during the Vietnam War to be an electronic monitoring signal relay aircraft, developed under the project name "Pave Eagle" for the USAF. A reduction geared Continental GTSIO-520 engine with turbocharger and three-bladed propeller was used to reduce its noise signature, much like the later Lockheed YO-3. These aircraft were intended to be used as unmanned drones to monitor sensors along the Ho Chi Minh Trail in Laos and report troop and supply movements. However when the project was put into operation in 1968, the drones were all flown by pilots of the 554th Reconnaissance Squadron.
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The source: globalair.com, the Internet.