the Nikitin-Schyevchyenko IS-4 proposed “polymorphic” fighter - a biplane with a folding lower wing which retracted into the upper wing - circa 1940 (via)
Friday, September 7, 2012
the Nikitin-Schyevchyenko IS-4 proposed...
the Nikitin-Schyevchyenko IS-4 proposed...:
the Nikitin-Schyevchyenko IS-4 proposed “polymorphic” fighter - a biplane with a folding lower wing which retracted into the upper wing - circa 1940 (via)
the Nikitin-Schyevchyenko IS-4 proposed “polymorphic” fighter - a biplane with a folding lower wing which retracted into the upper wing - circa 1940 (via)
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