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 ...

Carver Fred F: Aircraft sound simulation system. Singer General Precision, March 6, 1973: US3718987 (12 worldwide citation)

Sound generation apparatus to simulate the sounds made by a jet engine. By adding the outputs of two nominally identical oscillators constructed using non-precision components which cause them to have slightly different output frequencies a sound closely simulating whine is obtained. Amplitude of so ...

Carver Fred F: Simulated instruments. The Singer Company, July 25, 1972: US3679880 (5 worldwide citation)

A simulated instrument for use in a vehicle simulator, or the like, to indicate the value of an assumed quantity, position, or other variable requiring the value to be held over a relatively long time constant. The invention provides means for deriving electrical signals to drive the instrument by l ...