Youngman-Baynes High Lift Research Aircraft
From Graces Guide
An experimental flying test-bed for the system of slotted flaps invented by [R. T. Youngman]] was built by Leslie Everett Baynes. It used components from the Percival Proctor, and was built by Heston Aircraft Co.
1948 Test pilot Flight Lieutenant Ralph S. Munday piloted the first flight at Heston Aerodrome on 5 February 1948, carrying the military serial VT789, later registered G-AMBL.
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