초록 ▼

A propeller is controlled to change pitch at at least two different rates. In one embodiment, an electric motor is provided with a high or low voltage for driving a pitch change mechanism at a high or low change rate. Preferably the rate is selected automatically. Preferably, the high rate is not us

A propeller is controlled to change pitch at at least two different rates. In one embodiment, an electric motor is provided with a high or low voltage for driving a pitch change mechanism at a high or low change rate. Preferably the rate is selected automatically. Preferably, the high rate is not used unless the current pitch is below a threshold.

대표청구항 ▼

[ What is claimed is:] [1.] Apparatus usable for controlling pitch of an aircraft, comprising:a pitch change driver, coupled to said propeller which is controllable, in response to a first control signal, to selectively change pitch of said propeller at a first rate when said first control signal ha

[ What is claimed is:] [1.] Apparatus usable for controlling pitch of an aircraft, comprising:a pitch change driver, coupled to said propeller which is controllable, in response to a first control signal, to selectively change pitch of said propeller at a first rate when said first control signal has a first value and a second, faster rate when said control signal has a second value;a sensor, coupled to said propeller, which outputs a sensor signal indicative of whether the current pitch exceeds a first pitch threshold value;a controller, coupled to said pitch change driver, which receives said sensor signal and outputs said second value of said first control signal only when sensor signal indicates a current pitch below said threshold value.