The Burnelli GX-3, also known as Uppercu-Burnelli UB-SS. was an American twin-engined, mid-wing experimental aircraft which first flew in 1929. Work commenced on this aircraft during development of the Burnelli CB-16. Soon after, Daniel Guggenheim announced the Guggenheim Safe Aircraft Competition. Many manufacturers brought aircraft to this competition. The GX-3 was built in New Jersey, but did not arrive at the competition in time to participate.
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