I took an interest in this post principally because the 'Dual Props' caught my eye. (for those that may of missed my project post I'm using dual props,... and dual ESCs and dual motors). When I realised the dual props were mounted on the same shaft I got to wondering; Why? I figure it's got to do with availability. If your motor puts out sufficient power to drive say a 50x14 then you would fit one. But what happens if you can only source a 50x10 in your far flung home? would fitting two 50x10's and trimming the end off work? Does anyone else think maybe that's what he's up to?