Diamond John A, Sylvester Amedeo A, Carver Fred F: Apparatus for simulating aircraft control loading. The Singer Company, Kesterson James C, Rothenberg Jeffrey, September 9, 1975: US3903614 (221 worldwide citation)

An electro-mechanical system for providing an opposing force to movement of a simulated control member in a grounded flight trainer. The invention utilizes an electric motor connected to the control member by a flexible element which, in the disclosed embodiment, comprises a continuous cable with a ...

Grandmont Paul Emile: Improved apparatus for simulating aircraft control loading and feel. Curtiss Wright, August 22, 1956: GB755700-A

755,700. Flight training apparatus. CURTISS-WRIGHT CORPORATION. Sept. 8, 1954, No. 26064/54. Class 4. In flight training apparatus the control members operated by the student pilot are loaded in accordance with signals representative of indicated airspeed supplied by flight computing mechanism and i ...