Yes,
I remember reading all about them and how the Germans used them.
The very first ones they towed behind a sub was nothing but threaded pipe and a spindle head.
I'm close to Princeton, NJ and I do remember a commercial Gyro dealer at Princeton airport.
I think but not sure it was called a J-21?.
It was big and I remember them cutting the engine and rotating down then starting the engine up again.
In Italy they make a beautiful 2 seater.
The passenger sits in a raised seat in back of the pilot.
$21,000.00
Everything I want I can't afford..
In the mid 70's EAA had their magazine split up in 2 parts.
One for planes and the other part for rotor craft.
That was when the average person could afford to buy one.
Vegas/ http://rotorkite.biz/