While we are correcting fallacies, I will bring up the BMW roundel, which is was NOT designed to look like a propeller, despite the public's belief as so...
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It was on 5 October 1917 that the BMW trademark was registered with the Imperial Trade Mark Roll under No. 221388. It featured the circular design of the Rapp logo but with the letters BMW at the top of the outer ring. The inner featured quadrants in the Bavarian Free State colors of blue and white - but in the opposed order - as it was illegal to use national symbols in a commercial trademark.
The design was not in any way connected with aircraft engines or propellers. The idea that the blue and white had anything to do with spinning propellers comes from a 1929 advertisement, which featured aircraft with the image of the Roundel in the rotating propellers. This advertisement came at the beginning of the Great Depression, which coincided with BMW acquiring the license to build Pratt & Whitney radial aircraft engines. The advertising department used the roundel and BMW heritage in an attempt to increase sales of the new radial motors.
http://www.motorcyclistonline.com/ne...del/index.html
http://www.vintagebmw.org/version6/?q=node/140