drjeff
Well-known member
Not knowing much, I'd say it should perform like a sail when left open. The bubbles close automatically for the trip down.
Problem solved in that as the chairs leave both the top and bottom terminals there's a sensor that detects if any legs are hanging down (that's why the sign at the base says that at least 1 rider must be 4'6" and lift operators look for this) and if not the empty bubbles close automatically for both the ride down and if unoccupied the ride up.
With the bubbles closed, the wind flows around, over and under it pretty well. With it open, especially heading into the wind, the bubbles do act as sails, thats why on windy days, there's a sign as you load the chair, and the lift attendant telling you to close the bubble.
Will a closed bubble sway a bit in the wind? Yup. But without a doubt the Bluebird runs more often and in higher winds than the Grand Summit does.
Additionally, even before anyone loads the bubble, each chair weighs about 1400lbs. Add in a few chair occupants and you'll got well over a ton of mass to help the chairs stability in the wind. For reference, the old grand summit quad chairs that they sold off when Leitner-Poma through in new chairs for that lift when they installed the Bluebird, weighed a bit over 200lbs - and having lugged and tugged one of those old chairs around when I bought one, I'd fully agree with that 200ish pound weight of them
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