ORIGINAL: combatpigg
The definition of parkflyer has never been nailed down to my satisfaction. Someone mentioned 2 pounds or less and capable of less than 60 mph? That's way too much plane, what does a 2 pound plane weigh when it hits something at 60 mph?. I would draw the line at a plane not capable of cracking a 4 foot square window pane when flown into it at full throttle. whatever physical limits would make up such a machine should be about as safe, if not safer than an out of control kite.
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Yep, 2 lbs and 60 mph is way too much kinetic energy for a missile in a park setting. I am uncomfortable in that venue flying anything more than about 12 oz, and a slo-flyer or 3Der at that. Seems to me that other park users (and park officials) are much more likely to be accepting of models that are comparable in weight and speed, and so no more threatening, than flying objects thay are used to. Examples include Frisbees at 175 gm (~ 6 1/4 oz) and footballs at 400-430 gm (14-15 oz). Hard-thrown passes by pro QBs can travel at 40-60 mph. I sure wouldn't want to get hit by one. The AMA E-flite proposal, if your are right about the figures and I think you are, would allow models carrying several times the wallop of the most extreme example one might conjure up involving a football.
Abel