I've always fancied an autogyro too. Little Nellie come back, all is forgiven
Met W/C & Mrs. Wallis once. Charming couple. He still has all the autogyros he's built!!
Anyway, back to topic. They do seem to be getting more popular. The RAF 2000 looks like a nice machine. There was an article in Popular Flying a while back about autogyros. Seems that a lot of the earlier ones flew with McCollouch drone engines which were less than reliable and some machines had a problem with the thrust line not being in the optimum place(?).
Regarding negative g in turbulence, wouldn't the blades take the reduced lift into account by changing pitch (help here please Whirly) thus maintaining the load the hub "sees"? Something must happen or the place would be littered with folded up autogyros on a bumpy day <img src="eek.gif" border="0">
Still, they do look like loads of fun. Must investigate further.