Boeing has announced that it's Hummingbird drone has has successfully changed the final drive ratio of its transmission in flight, which will allow two rotor speed settings, one being about ½ of the other.It turns out that slower rotational speeds work better at hover and low speeds, but limit forward speed, because of retreating blade stall, and most helos therefore operate as a compromise. (The A160T set its record in slow rotor mode).
All in all, this program is moving along at a blindingly fast pace, with US special forces already making purchases of the diminutive helicopter.
Boeing's PR is here.
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