RE: Beginning in 3D flight
I have the 47" Extra 300 SHP so I am not sure of the flight characteristic's of the Katana and Yak but there are links at [link]http://3dhobbyshop.com[/link] that will take you to amother forum where the owner and a couple of the designers (that also happen to fly the full scale versions) hang out and can help you much better than I can
Rob