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RBF Definitions
Symmetrical means having no local asymmetries. Omni-symmetrical permits local asymmetries. Universe is omnisymmetrical. A three-bladed propeller is dynamically symmetrical (three pear-shaped blades at 120° to each other inscribed in an equilateral triangle). The propeller blade is locally asymmetical." - Cite RBF to EJA, Blackstone Hotel, Chicago, 31 May 1971.
