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From the Bernard Lindenbaum Vertical Flight Research Collection:

1031-B............variant of PAWNEE flying platform, no details [possibly the later deep-duct version] (1957)
1051...............initial designation of X-18 [System 451L]; became Model 1085 after modifications [System 607A]
1069...............rotor-prop convertiplane project
1082...............Multi-Purpose Turbine Powered Helicopter proposal (1958)
1099A.............TEN99A Missile Site Support Helicopter proposal to USAF (1962)
1117...............Light Armed Reconnaissance V/STOL Aircraft (1964)

[QUOTE="Stargazer, post: 139128, member: 3129"] [i]From the Bernard Lindenbaum Vertical Flight Research Collection:[/i] [b]1031-B[/b]............variant of PAWNEE flying platform, no details [possibly the later deep-duct version] (1957) [b]1051[/b]...............initial designation of X-18 [System 451L]; became Model 1085 after modifications [System 607A] [b]1069[/b]...............rotor-prop convertiplane project [b]1082[/b]...............Multi-Purpose Turbine Powered Helicopter proposal (1958) [b]1099A[/b].............[b]TEN99A [/b]Missile Site Support Helicopter proposal to USAF (1962) [b]1117[/b]...............Light Armed Reconnaissance V/STOL Aircraft (1964) [/QUOTE]

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