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<blockquote data-quote="Stargazer2006" data-source="post: 68380" data-attributes="member: 3129">I have just come across yet another non-standard experimental Navy designation: UH-1X... ???&quot;Although no specific military requirement yet existed for such a machine, the [Hiller] X-2-235 was intended primarily for U.S. Navy use in the light utility, observation, and training roles. The Navy did not actually order the type, but it did procure the third uncompleted X-2-235 under the designation UH-1X, for evaluation in NACA wind tunnels at Langley Field, Virginia. Vibration problems curtailed these tests for fear of damaging the wind tunnel, but not before results vindicated the Hiller group's belief that super-rigid coaxial rotors were a valid approach to very highspeed helicopter flight.The UH-1X, Hiller's first military contract, clearly ran counter to normal aircraft engineering, but then the team building it had experience only in designing ships, bridges, and similar beefy structures.&quot;(source: J. P. Spencer &quot;Whirlybirds: A History of the U. S. Helicopter Pioneers&quot;, 1998)Now honestly, how they came up with that odd designation is beyond me...&nbsp; :-\</blockquote>

[QUOTE="Stargazer2006, post: 68380, member: 3129"] I have just come across yet another non-standard experimental Navy designation: UH-1X... ??? "Although no specific military requirement yet existed for such a machine, the [Hiller] X-2-235 was intended primarily for U.S. Navy use in the light utility, observation, and training roles. [b]The Navy did not actually order the type, but it did procure the third uncompleted X-2-235 under the designation UH-1X[/b], for evaluation in NACA wind tunnels at Langley Field, Virginia. Vibration problems curtailed these tests for fear of damaging the wind tunnel, but not before results vindicated the Hiller group's belief that super-rigid coaxial rotors were a valid approach to very highspeed helicopter flight. The UH-1X, Hiller's first military contract, clearly ran counter to normal aircraft engineering, but then the team building it had experience only in designing ships, bridges, and similar beefy structures." [i](source: J. P. Spencer "Whirlybirds: A History of the U. S. Helicopter Pioneers", 1998)[/i] Now honestly, how they came up with that odd designation is beyond me... :-\ [/QUOTE]

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