The AC4, was, probably the best machine at the time.
Brazilians still not producing a good modern gyro, the Hummingbird is the first attempt of a machine based on Air Command, possibly Butterflyish.
If I have a choice, will pick Dominators and Monarchs as single seaters and for a training machine my vote goes for the Golden Butterfly, the Turbo Golden may be even better, but I don´t know enough about it.
It is true they are flying pure ethanol down here, have seen them in action . . .even one flying while a big crack on the head was gushing fuel . . .security is not the best feature among our peers here.
Problems with the AC4 nowadays: not enough power, fuel thirsty, no horizontal stab.
They fly good with one and I have seen two aboard with good results, for the kind and place.
Lets hope the guys in Rio are inclined to go manufacturers and replicate the Butterfly line down here. I can do very little these days . . .
It is a great country to fly a gyro, open skyes and breathe taking scenery!
Thanks
heron
Butterfly gyros are on the top of world shelf for gyros.