The paper also describes a ground demonstration of a one channel primary flight control system and a flight demonstration of an aileron trim control system.

同时还介绍了一单通道主飞控系统的地面演示和一副翼配平控制系统的飞行演示。

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Substantially more complex than previous aircraft, the new plane required the pilot to attend to the four engines, a retractable landing gear, new wing flaps, electric trim tabs that needed adjustment to maintain control at different airspeeds, and constant-speed propellers whose pitch had to be regulated with hydraulic controls, among other features.

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