Originally Posted by woolebugr
GWS props have numbers on them that start with "DD", "HD", and "RD". I understand what the numbers mean (9070=9x7) but I don't know the difference between the DD, HD, and RD. Can anyone enlighten me? Thanks
All I know is that DD stands for Direct Drive which, I gather, is for high RPM use, RD stands for Reduction Drive which is for lower RPM use on geared power systems and HD stands for Hyper Drive which I believe is also a high RPM direct drive prop, perhaps for non-electric power systems (just a guess)? I'd love to hear a much more in-depth explanation of these myself since I couldn't find anything on the GWS site about this when I looked there some time ago.