I wish we could swap blades to test a speculation of mine.
Oops...In that case I miss read it and retract what I wrote about select one set of blades over the other!!!In my opinion both the gyroplanes I fly have measurable rotor ground effect.
I don’t think it is important and I will not try to explain why.
This is getting off topic, but...
After check, I am surprised as you, Juergen.The 25% difference for the extreme cases is indeed close to Vance's numbers, but for two fairly modern gyros with - I assume - stock blades by fairly experienced manufacturers I can hardly believe that the difference in drag coefficient would be anywhere near the 70% needed in my example to get the rrpm difference we are looking for.?
I am in Buckeye, Arizona now and it will be several weeks before I can measure the pitch on The Predator.I do hope that Vance will provide values for the pitch settings, that'll be very interesting indeed!