Originally Posted by
tail wheel
I suspect their risk assessment is based upon the fact RC aircraft have been around for decades, drones more recent, there must be "very significant numbers" of both out in the community, and so far no mid airs. Not saying it can't happen, but there is a lot of air up there and despite the cowboys and kids with RC models and drones, a bingle hasn't happened.
The fact that RC aircraft have been around for decades is irrelevant.
RC aircraft have always been flown by line of sight which of course limits their altitudes greatly, and unless you are experienced you will lost orientation very quickly as they get smaller, so "self preservation" means amateurs fly low.
Proper RC flying fields where larger, heavier aircraft fly are marked on charts, the odd "foamy" you might see at a local park is no issue.
The issue with drones is the first person view and gyro stabilisation means anyone can fly them beyond visual range, with no skill required and at full-size aircraft heights.