First of all any club or event director can refuse permission to a participant as long as its not based on what is clearly defined as discriminatory under present legislation.
Most of what people refer to as rules of the organization is simply guidelines and as such don’t really have any teeth to them. In fact most clubs have more enforceable rules than the parent organizations AMA or MAAC.
Take for instance these radios by Hobby King. These are not approved in either the US or Canada and both organizations recommend that you not use them. Neither organization bans them nor, if you ask will using them void your insurance. This is what you need to understand about a recommendation.
Now lets say at an event someone were to show up with heaven forbid a 40% or jet guided by one of these radios. The club determines this is not safe and makes a ruling banning these radios at this event. The club has now made a determination that the unapproved radios made by Hobby King are not safe. The club now would assume sole responsibility if they allowed these radios to be used at any other time and an accident were to take place.
The same when you ban a particular model at an event. Once banned how is it safe to fly at any other time. Be careful about banning things under the guise of safety. Once you determine something is not safe it will not become ok to fly it when the event is over. Unsafe is unsafe.
We just went through this minefield with the Hobby King stuff. Tough call either way.
Dennis