All - You convinced me. So I now have a bid for the two other books in the series - "More Helo Aerodynamics" and "Even more helo aerodynamics". Anybody who's not reading them anymore want to sell?
Regarding Cierva's unfrtunate gyro here is what I meant - as forward speed increased the gyro's rotor should have tilted aft (and that would be, more or less, an illustration of dissimetry of lift). Since it was a rigid rotor, the whole gyro tilted aft. So my remark was -- why say that it "rolled over"? in itself this fact does not illustrate the whole issue with flapping/dissimetry of lift.
Now, the gyro probably did roll over, but I think this is because when there was a sudden and strong pitchup moment, then the gyro's rotor did act as a gyroscope and rolled on the side (and the whole autogyro with it).
BTW Im French so I think the remark on England winning the world cup is out of place.
And regarding Proutty's book on stability and control -- yes, I had been thinking about buying it but it kind of seemed expensive, relative to Leishman's and Stepniewsky's. But I know that is a relatively stupid reason so I'll probably get t soon.