GG did the right thing dodge dodge dodge. As for hearing a heli coming I live in a USMC chinook training lane and sometimes when they fly over my park I dont notice them untill the rotor wash is making my bird go squirly. Opinions aside small nimble RC craft can dodge and investment time and money will make you try and save you plane every time. I live in Denver Colorado. If a heli pilot does something wierd up here everybodys on his ass emediatley. Dosnt matter what anyone thinks about it if a full size pilot is doing something to endanger people even himself it needs reporting. As for the park rangers getting grief over letting you fly there, well thats just bs. The heli pilot was/is wrong for endangering your life and his by flying low over you. You can scoff all you want but try standing close to a .60 size heli when its taking off. you may discover a few things about keeping the tarmac clean of debri.