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The Vultee XP-68 Tornado was proposed American high-altitude interceptor aircraft. It was based on the experimental XP-54 Swoose Goose powered by the Wright R-2160 Tornado 42-cylinder radial engine driving a set of contra-rotating propellers in a pusher configuration. When the engine was canceled, on 22 November 1941, the XP-68 was also canceled.
References
Vultee XP-68 Tornado Wikipedia(Text) CC BY-SA