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Sikorsky X2 coaxial heli developments.
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8th Dec 2007, 22:14
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Dave_Jackson
Join Date: Apr 2003
Location: Vancouver, BC, Canada
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IFMU said
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The hardcopy has a picture in it.
Is this the picture?
You've got to admit that those are darn close rotors for a mid-1930's helicopter.
Dave
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