The Aerodynamic Forces and Moments Exerted on a Spinning Model of the NY-1 Airplane as Measured by the Spinning Balance (1934)
NASA Technical Reports Server (NTRS) · leaf 5
Figure 1—The NY-1 airplane model mounted in a spinning attitude in the downward flowing air stream. The 6-component balance (shown with cover removed to display mechanism) revolves with the model.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.