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Balanced and servo control surfaces (1930)
NASA Technical Reports Server (NTRS) · leaf 16
Figs.1,2. N.A.C.A. Technical Memorandum No,563 … Fig.2 Five typical tail units showing different types of rudder and elevator balance.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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