Helicopter Aerodynamics Volume II

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Lulu.com, 2009 - Technology & Engineering - 364 pages
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This is a collection of the Ray Prouty's columns in Rotor and Wing and American Helicopter Society's Vertiflite magazine from 1992 to 2004.
 

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Contents

Chapter 1
1
Maximum Speed
7
Bucket Speed
9
Maximum Thrust
11
Feathering Equals Flapping
15
The Helicopter in Trim
19
Airfoil Aerodynamics
21
Airfoils The Third Generation
29
NeverExceed Speeds
171
Speed Stability
177
Center Of Gravity Position
181
Dutch RollDesign Compromises
185
Torque Change with Roll
187
Why Hovering Helicopters Are Unstable
191
Damping Is Good
195
Settling With PowerAn Explanation
197

Center of Pressure or Aerodynamic Center?
31
Dynamic Lift
33
The Gurney Flap
37
The Compound Helicopter
43
The Truth About Propellers
47
The Truth About Wings
51
Tandem Helicopter Trim
55
Coaxial Helicopters
57
The BERP Tip
63
The Scissors Rotor
69
A Tiltrotor Challenge
73
Tiltrotor Download in Hover
75
FanInFin
79
NOTAR
83
Vertical Tail Surfaces for NOTAR
89
Horizontal Tail Trouble
93
How the Apache Got Its Tail
97
The History of Cyclic Pitch
103
The Hover Problem
107
Vortex Rings in the Hover
111
HoverAn Uncertain Flight Condition
115
Flying High
119
Managing Energy
125
Rotor Outwash
129
Helicopters and Ride Quality
131
Reduced Visibility Effects
133
Flight Testing to New Standards
137
The Sidearm Controller
143
The Downwind Turn
147
A Tragic Accident
151
A New Look At Dynamic Rollover
153
Tail Rotor Failures
155
Translational Lift
159
Unrealistic Practice Autorotations
161
Autorotation Concerns
163
Maximum Descent Angle
165
An Autorotational Paradox
167
Rotary Wing Aircraft In Steep Descents
201
TailRotor and MainRotor Interactions
205
Computers And Rotor Aerodynamics
211
TwoG Charlie
213
Floquet Theory
215
Numbers And Helicopters
217
Tip Loss
225
Root Stall
231
Coriolis Effects
235
Angle Of Attack and Lift Distribution
239
Torque Distribution On Two Rotors
243
Torque Distribution In Autorotation
247
Slots And Flaps On Rotor Blades
249
CirculationControl Blades
251
The JetFlap Rotor
255
Wind Tunnel Wall Corrections
257
A Wind Tunnel Dilemma
261
New Tail End for the MD 600
265
Mechanical Blade Couplings
269
The Order of the Hinges
273
CrossCoupling Mystery
277
Some Coupling Considerations
281
Noise Regulations
283
Designing Quiet Helicopters
289
BladeVortex Interaction
299
Vibration Prediction Is Difficult
303
A Tale of Luck in Helicopter Design
307
Flutter
309
Gs Versus IPSs
313
Vibration Absorbers
315
Smart Materials And Helicopters
319
Calming The Rotor
323
Gerard Herrick and his HV2A
333
The Sikorsky R6
339
Helicopters in China
343
Ray Proutys Personal Library
349
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