Good point Vin, maybe that would explain the odd rudder design on the Gryphon (just for AMA) U.S. variant.
I also fly my AD F16 'Without rudder function' although I do have one installed incase I want to fly south of the border.
I also have an Avonds F15 without rudders and will not install rudders, both kits were designed without the need for rudder operation/inclusion. The Gryphon should fly very well also, based on Eric's previous designs especially the AD F16. I have been flying R/C for over 28 years everything from gliders to giant scale and jets and the AD F16 is still the best/easiest flying jet model I have owned... I would not hesitate in recommending Aviation Design products and aftersales service, and very good value for money.