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The upper boom folds back almost to a right angle to the lower boom

Yes that answers. I think that is a good feature to save fuel, wish mine had it.

Surprised you didn't show full articulation of the booms. The engine throttles up when outriggers are activated, is that the same when the booms are moved or do the rpms stay throttled up full time when the booms are aloft?

U lucky bastid!

Yup