Hi Y'all
I don't think the Pico suffers from Vortex Ring for some reason I cannot explain. R1 and Simon, I was flying mine in the hangar the other day (expensive full size model on the pad outside). It will fly to maximum altitude, 25 ish feet limited only by the ceiling, I chop the power and it falls vertically. The blades slow to virtually stationary but on application of full power, it will recover and fly away.
Try BluTac on the nose for serious increase in speed!!
J9