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Published online by Cambridge University Press: 28 July 2016
The suggestion has been put forward by Dr. A. P. Thurston that the characteristics of a wing can be considerably improved by adding self-starting rotors at or near the wing tips. It is claimed that by placing these on each wing near the leading edge improvements analogous to those of a slotted wing tip can be obtained together with slow landing characteristics. Previous experiments (1) have shown that rotors can give about the same degree of lateral stability as tip slots. The primary object of these experiments was to test the second assertion, and the criterion by which this should be judged was that the gliding angle should be as steep as possible for a given rate of descent.
* These rotors were very flexible, particularly near the tip, and it is probable that they distorted under load. One of the wooden rotors (No. 29) was copied in brass, and the performance of the metal rotor was inferior to that of the original wooden one.