ORIGINAL: HoundDog
<span style=''font-weight: bold;'' id=''yui_3_7_2_28_1373887319837_58''><font size=''3'' id=''yui_3_7_2_28_1373887319837_57''>One of our absent minded poorly informed or what ever Heli flyers brought his very expensive chopper back to the pits with out disconnecting the batteries and proceeded to shut off the radio. Well that Heli jumped about a foot off the table under the sun shade and fell to the concrete and proceeded to trash it's self to death. He was lucky because in his haste to get away from his errant piece of now Junk, flopping around like a flonder, he almost dropped expensive heli radio. Crap should not happen, RULES are made for your and everyone's safety.
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Absent mindedness isn't just restricted to the electric folk though, a heli pilot in our club was blade tracking his nitro in the taxiway (while others were flying). We're a fairly relaxed club but things don't go un-noticed, he landed, got down on his belly and spun it at zero pitch, then changed the condition (??) and up like a rocket it went with him still laying on the ground. It was already reasonably well trimmed so it didn't go sideways much as it went up before he killed the power and dumped it a bit down the paddock.
I have heard of an Oxai F3A ship destroying itself against a clubhouse when the TX was turned off because the failsafe wasn't set correctly. ~3kW into a 22" diameter electric prop [X(]
The key is, any safety system employed needs to be simple and easy to use so that it will be used. TBH, carrying a heli back to the pits with the batteries still connected is lazyness and poor practice, it should only take 5-10 sec to pull the power before picking it up and walking back.