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1
Rotorcraft Aeromechanics
Impulsive noise or blade slap is a sharp cracking, popping, or slapping sound
occurring at the blade passage frequency and produced by the main rotor in
certain flight conditions. Blade slap is a periodic, impulsive sound pressure
disturbance ...
2
Civil Aviation Research and Development, an Assessment of ...
The most identifiable and most annoying feature of some types of helicopter and
V/STOL aircraft is the impulsive noise, commonly referred to as blade slap, which
can be generated under conditions of blade vortex interaction, critical Mach ...
3
Annoyance, Loudness, and Measurement of Repetitive Type ...
3.2.2 Helicopter Blade Slap Noise Helicopter blade slap is a troublesome
impulsive noise source which has 81 received a great deal of attention as to
causes and effects. This attention has focused, most recently, upon the practical
problems ...
L. C. Sutherland, Richard Eric Burke, 1979
The paper considers a possible mechanism for the generation of blade slap. A simplified theory for this is presented which shows good agreement with the results obtained from a test rig on which blade slap was simulated.
F. Webb Taylor, John W. Leverton, SOUTHAMPTON UNIV (England), 1966
5
Helicopter Aerodynamics Volume II
Somewhat surprisingly, it shows that even in level flight and climb at certain
speeds, these helicopters produce blade slap. This is probably due to the region
of upwash at the front of the disc which makes the tip vortices generated in this
region ...
It makes no allowance for the obvious possibility that the vehicle might be flown
in such a way that it could avoid severe, or perhaps even modest, blade slap. In
recent years, the formulation of noise certification standards for helicopters has ...
Michael J. T. Smith, 2004
7
Transportation Noise and Noise from Equipment Powered by ...
Blade slap is the colloquialism that has been applied to the sharp cracking sound
associated with helicopter rotor noise sources. To date, the only attempt at a
quantitative study of the problem seems to be the papers published by Leverton ...
Up until recently, nobody who manufactures or flies helicopters had a much
better explanation for the audible phenomenon known as "blade slap" than the
man in the street. Obviously, everybody would profit from quieter helicopters; but
...
9
Adventure Tourism Management
The type and designof engine used,andto a lesser extent theplacement of the
engineand the design oftheengine compartment, aremajor factors influencing
noise generation.For helicopters, blade slap may be equally significant. This is
the ...
10
Flight Performance of Fixed and Rotary Wing Aircraft
17.8.2 Impulsive Noise Impulsive noise, also called blade slap, is a noise created
by a blade passing through the slipstream of a preceding blade, through an area
of increased turbulence. It is a cracking noise created at the blade passing ...
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «BLADE SLAP»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
blade slap w wiadomościach.
Managing Helicopter Noise
The distinctive aerodynamic rotor blade slap noise generated by helicopter rotors is difficult to disguise. Blade slap (technically “Blade Vortex ... «Aviation Week, Lut 15»
Weedless Lures, Dont Let The Weeds Stop You From Fishing
Holding your rod tip up letting the spinner bait blade slap the topwater while reeling it very slow is the best presentation over surface weeds. «BassResource.com, Lip 13»
Helicopter Hella Loud, Part 2: Can the FAA Regulate the Noise …
That signature sound, familiar to anyone who has ever heard a helicopter, is often called blade slap. Blade-vortex interaction, a more technical ... «KCET, Cze 11»
