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Likely just a case of feathering (ha!) the blades: changing their angle of attack so they don't produce as much lift, plus a bit of braking.

Presumably with a bit of surveying pre-construction you can make a good guess at your expected curtailment time and bake that into the financial model

> if a bird is heading toward the chopper, what can you do?

Tennis?

Maybe play predator sound with loud speaker?

Yeah that part is a little vague in the copy.