Vultee XP-68 Tornado

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

Andrade, John M. U.S. Military Aircraft Designations and Serials since 1909. Earl Shilton, Leicester, UK: Midland Counties Publications, 1979. ISBN 0-904597-21-0 (Hardcover), ISBN 0-904597-22-9 (Softcover).
Angelucci, Enzo and Peter Bowers. The American Fighter, The Definite Guide to American Fighter Aircraft from 1917 to the Present. New York: Orion Books, 1987. ISBN 0-517-56588-9.
Thompson, Jonathan. Vultee Aircraft 1932–1947. Santa Ana, CA; Narkiewicz/Thompson, 1992. ISBN 0-913322-02-4.
Wagner, Ray. American Combat Planes of the 20th Century: A Comprehensive Reference. Reno, Nevada: Jack Bacon & Co, 2004. ISBN 0-930083-17-2.

USAAS/USAAC/USAAF/USAF fighter designations 1924–1962
Pursuit (pre-1948) Fighter (post-1948)	P-1 P-2 P-3 XP-4 P-5 P-6 XP-7 XP-8 XP-9 XP-10 P-11 P-12 XP-13 XP-14 XP-15 P-16 P-17 YP-18 YP-19 YP-20 P-21 XP-22 P-23 YP-24 P-25 P-26 P-27 P-28 P-29 P-30 XP-31 P-32 P-33 XP-34 P-35 P-36 P-37 P-38 P-39 P-40 XP-41 P-42 P-43 P-44 P-45 XP-46 P-47 XP-48 XP-49 XP-50 P-51 XP-52 P-53 XP-54 XP-55 XP-56 XP-57 XP-58 P-59 P-60 P-61/C XP-62 P-63 P-64 P-65 P-66 XP-67 XP-68 P-69 P-70 XP-71 XP-72 P-73 P-74¹ P-75 P-76 XP-77 P-78 XP-79 P-80 XP-81 F-82 XP-83 F-84 F-85 F-86/D XF-87 F-88 F-89 XF-90 XF-91 XF-92 YF-93 F-94 F-95 F-96 F-97 F-98 F-99 F-100 F-101 F-102 XF-103 F-104 F-105 F-106 F-107 XF-108 XF-109 F-110 F-111/B
Pursuit, Biplace	PB-1 PB-2 PB-3
Fighter, Multiplace	FM-1 FM-2
¹ Not assigned See also: F-24 • F-117 • P-400 • post-1962 sequence

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