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THE VDM electric propeller is used almost exclusively on all types of operational aircraft in the German air force. This propeller, Mr. Waugh concludes after his thorough study, is versatile, well designed, and well constructed; however, it is not superior to comparable British and American units. Pitch-change rate of the model described here is inadequate for high-performance air-craft, but the propeller is very easily and quickly disassembled and serviced. The model is easy to manufacture, but, because of the large numbers of small parts, takes longer for inspection and assembly than for American propellers. The VDM spinner is well worth study, as it is superior to American spinners, at least from the removal and installation standpoint. It takes only a matter of seconds to remove or install the VDM spinner, while American spinners take much more time and effort.
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