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So, are we talking NEW logs, or retrofitted logs? I can't even comprehend how they'd fit a lapbar system into the current logs.
And in the logs at other parks that already have them, how are they operated? Is there a new mechanical device in the flume that triggers them (like on many of the dark rides) or will a CM have to step on some sort of pedal on the side of the log, or do they pull down manually (like BTMRR) and then release somehow at unload?
Lapbars can only decrease capacity, that's a fact. Like someone said, people are already too dumb to get in and out of a log as it is. Add one more guest and/or CM function and you can be assured that waits will increase significantly.
Regarding the possibility of them rusting - they won't. They'll be made out of stainless steel or an alloy with similar properties - just like the metal parts under the logs.