Boulton Paul P.120

The Boulton Paul P.120 was a research aircraft designed and produced by the British aircraft manufacturer Boulton Paul. It was the last aircraft design by the company to be flown.

The P.120 was developed to investigate the aerodynamic properties of the delta wing configuration. Performing its maiden flight on 6 August 1952, the sole aircraft conducted a series of test flights from RAF Boscombe Down. The P.120 was very similar to the earlier Boulton Paul P.111, a tailless experimental aircraft, but principally differed by having a horizontal tailplane as well as its fixed wingtips. The sole aircraft was lost in a non-fatal incident after encountering severe flutter; the test pilot, "Ben" Gunn, safely evacuated the plane by way of its ejection seat; the first ejection from a delta wing aircraft. While plans were made to rebuild the P.111 into a second P.120, these were not actioned and as a result no further activity with the type occurred.