I know some carbon stuff is not legal for F16's, like beams, spin pole, etc. but are carbon rudder cross bars and tiller ext. legal?
The spin pole, cross bar, tiller extension, rudder arms and mast are all carbon on my boat. More recent Stealth have carbon booms and carbon rudder castings. Some even have carbon beams. Nothing in the rules puts any limitation on materials. Are you sure you're not mixing us up with F18 ?
