The noise environment of a school classroom due to the operation of utility helicopters
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Hilton, D. A.↗
Engineering topics
Pegg, R. J.
Publications and source records attributed to Pegg, R. J..
Results of the flight noise measurement program using a standard and modified SH-3A helicopter
A field noise measurement program has been conducted using both a standard SH-3A helicopter and an SH-3A helicopter modified to reduce external noise levels. Modifications included reducing rotor speed, increasing the number of rotor blades, modifying the blade-tip shapes, and acoustically treating the engine air intakes and exhaust. The purpose of this study was to document the noise characteristics recorded on the ground of each helicopter during flyby, hover, landing, and take-off operations. Based on an analysis of the measured results, the average of the overhead, overall, ontrack noise levels was approximately 4 db lower for the modified helicopter than for the standard helicopter. The improved in-flight noise characteristics, and associated small footprint areas and time durations, were judged to be mainly due to tail-rotor noise reductions. The noise reductions were obtained at the expense of required power increases at airspeeds greater than 70 knots for the modified helicopter.
Pegg, R. J.↗
The effect of various operating parameters on the noise radiation patterns from a helicopter in forward flight
Helicopter in-flight noise radiation pattern and spectra measurements for various operating parameters
Pegg, R. J.↗
A flight investigation of a lightweight helicopter to study the feasibility of fixed-collective-pitch autorotations
Flight investigation of lightweight helicopter to study feasibility of fixed collective pitch autorotations
Pegg, R. J.↗
Flying quality factors currently limiting helicopter nap of the earth maneuverability as identified by flight investigation
Flight tests with helicopters for studying manueverability
Champine, R. A.↗
An investigation of the helicopter height velocity diagram showing effects of density altitude and gross weight
Helicopter height-velocity diagram analysis showing effects of density altitude and gross weight
Pegg, R. J.↗
AERODYNAMIC OBSERVATIONS FROM FLIGHT TESTS OF TWO VTOL AIRCRAFT
Effect of ground proximity, wing-stall phenomena, pitching moments, and power requirements on vtol aircraft
GROUND EFFECT↗
Aerodynamic observations from flight tests of two VTOL aircraft
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Gustafson, F. B.↗