Hi Shaun: Thanks, I'm working on re-testing the props (or I will be this weekend). I would like to increase the number of trials before I feel comfortable that the data is good enough to escape out into the real world. What I have does that suggests that, at least for APC non-MR and MR, there isn't a huge difference (if any) between them in terms of thrust/watt. I'm working on some responsiveness tests (that is rapid variation in throttle) to see whether there is a difference in terms of the likely stability when hovering, say. Andy.