Originally Posted by
ira d
Not sure what your point is but I think most people that fly RC know there is no larger risk to anyone by flying over 400' vs below 400' and no one has proved different.
400' is a theoretical 100' separation from the 500' minimum rule. But there is an exception over "sparsely populated areas" where F/S planes can be below 500", and where many (most) RC fields are located, making the 400' limit essentially meaningless since F/S planes can be expected at any altitude. Yes, there is a 400' rule, be aware of it. Other than that, much-a-do about nothing other than to argue about it on RC forums.