Dave_Jackson,
I'v been told about this limitation. But i don't plan to market something at the moment. XWe have not this limitation in france and europe.
BTW, a rumour says that Ermie Boyette (dominator )and Dick Degraw are preparing a kind of 3 bladed rotor with jump take off capabilities... i bet they will find the right category... i bet the 3 bladed rotors offer is prone to increase.
BTW some 3 bladed gyros (lioré and la cierva) didn't have a helicopter-like cyclic control but a "teetering" 3 bladed one with an offset gimbal.....
http://rvtpanet.club.fr/Articles/Liv...tete_rotor.jpg
thanks