This may be an unusual question, but if Zinger, and Top Flite , props are so ineffecient and terrible performers, why do they keep making them. These manufacturers have access to the same design and development as others... hobby shops are stacked with these brands, as well as Master Airscrew...someone must be buying and using them, and are satisfied with the results.....
I'm not trying for an argument, just some input to my question..