Bruce, I watched a DS video where a short-lived record was made up north on a beach. The plane exploded on a onshore pass... the wreckage ended up in the surf!
Vincent Hill where the DS guys go really fast is only 2 miles from where I slope. Probably far enough, but I wouldn't be surprised to find a battery pack or servo land there...
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Many years ago I -heard- a control-line Proto speed plane hit a spectator. The fuselage/motor slid off the wing, which remained attached to the Monoline™.
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As I was the AMA Control-Line Contest Board Chairman at the time, that and a couple incidents involving safety at the 1962 Chicago Nats led the AMA President Pete Sotich and I to make things a bit safer... the control-line pull-test was modifed to test for precisely the bad wing-fuselage joint, and spinners were added to R/c airplanes following a head-strike to a control-line flier by an out-of-control r/c plane doing a demo on the last Sunday of the event.
It seems some of the control-line speed fliers.. and these were the good ones, were cheating on the pull test, to save their modified Monoline™ units. They'd attach the control wire to a hook they'd surreptitously hold under the wing, so the hook took the load.
With both hands around the fuselage, the wing-fuselage joint is fairly tested. No hands on the wingtip..
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The fastest model I've seen that scared me is one of the cars running on the wire at Whittier Narrows. I watched the pusher get it going, the guy in the center whip it up to speed, and get up on the pylon support.. the car -vanished-! All that was visible was a red streak on the -other- side of the circle! The catch barrier wasn't much taller than the car, and gave me ZERO confidence in its ability to actually contain a loose vehicle.
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As for jets, it's not the kinetic energy they represent so much as it is the lack of safety when flying at 200 mph. 200 yards out is where they should be, not 20 feet out at a foot above the runway!
I never went back.