V.A.C.A. Technical Memorandum Not 818 Figs. 20.21,22.23 … Figure 21.- Resonance factor for different ntanbers of oeclllatione per rotation. r—^ i ,J ^---^ L—L,--{ L-J L....J L..,J L.,-J L„J Figure 22.- Building up spring ^-"'ziieC vibrations after the first lift (conqputed). 2»i8v.
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