Wind Tunnel Tests on Autorotation and the "Flat Spin." (1928)
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d largely to the basic assumption of uniform force distribution across the span. The very apparent sunilarity of the monoplane polars from 30° to 90°, and the wide differences between monoplane and biplane in Figure 12, indicate that wing arrangement and not wing profile is the controlling factor… … Fig. 12.—Force tests on four models The criterion for rotary instability is developed from the strip iiicthod analysis of wing systems only. Therefore the presence in the complete model polars of the forces upon body, tail, and landing gear may be expected to introduce errors in determining the…
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