The Dowty aerospace-equipment manufacturing group based in England has spent four years working in secret on the development of a regulator device to reduce the noise from jet engines.
LV Aircraft engine on outside mount
CV&MV Meters (voltameter and tachometer)
CV&MV Blade angle and Percentage load meters
LV&CV Jet engine operating on mount (3 shots)
CV Operator at controls
CV Turbine blades alter pitch (2 shots)
LV Engine on mount
Initials OJP/PN/MH/1200 OJP/PN/MH/1226
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Background: The Dowty aerospace-equipment manufacturing group based in England has spent four years working in secret on the development of a regulator device to reduce the noise from jet engines.
A wide range of regular test readings has been carefully analyzed, and indications are that use of the regulator could bring about much quieter living conditions for those close to airports. A noise reduction of more than 50 percent over present "by-pass" jet engines is expected.
The reduction is noise is achieved by using a large slow-running fan in front of the engine. It also enables shorter take-offs and landings by improving the thrust repones of the engine. An extra safety angle is that failed engines can be shut-down and completely stooped in flight.
The regulator varies the pitch of the fan blades so that the engine can operate at peak efficiency in all flight conditions. An important feature is the ability to provide reverse thrust for braking to standstill.....at less weight and cost than conventional units. The noise regulator could be in use by the mid-1970's.