I'm working with a small airport whose A/FD listing says "Ultralights prohibited". No one can remember when or why that restriction was put in, and the airport wants to be more accommodating . After talking with a few certificated pilot friends of mine who fly out of the field in question and what their concerns would be, they boiled down to confusion in the pattern and having to break-off landing patterns because of slow traffic. To address those concerns, my first draft of new language is as follows, please comment:

"Ultralights without radios and/or the ability to maintain 40 knots on approach are prohibited."