A Description of the Early Problems Encountered by Rolls‐Royce Ltd., which Led to the Appointment of a Specialist ‘Rotor Balance’ Engineer, and a Review of the Company's Current Balancing Techniques. THE advent of the gas turbine aero engine brought a state of passenger comfort, never before experienced, into the field of civil air transport; this was possible because the unbalanced forces due to reciprocating masses are entirely absent and the purely rotating masses of a turbine engine can, theoretically, be brought into perfect balance. The resulting smooth running engines produce lower levels of passenger fatigue due both to physical effects (i.e. a reduced feeling of ‘pins and needles’ in those parts of the anatomy touching the cabin floor or scat) and to aural effects (i.e. a lower noise level from engine buzz or cabin panels and fittings resonances).
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