ESDU AERO C.01.01.04
Effect of gap on the slope of lift curve and slope of lift increment curve due to control surface deflection.
Abstract:
ESDU Aero C.01.01.04 states that the rate of change of the lift coefficient curve with control deflection for a surface with a control with a gap is given by the product of its value when there is no gap and the ratio of the liftcurve slopes with and without gap multiplied by a factor, f. Curves plot the ratio of the liftcurve slopes for various gap sizes and chordwise positions of the gap for twodimensional flow and for a wing with an aspect ratio of 3; linear interpolation between these two sets of curves with the reciprocal of aspect ratio is suggested. The gap sizes for blunt, circular and ellipticalnosed controls are defined in sketches. The factor, f, is plotted against balance, that is the ratio of the areas of the control forward and aft of the hinge line, for each of the nose shapes. Those curves apply to a gap greater than 0.004 times the aerofoil chord and for values less than that it is suggested linear interpolation with (1  f) be used. The rate of change of the lift coefficient curve with control deflection for a surface without a gap may be found from ESDU Aero C.01.01.03. The method applies to full span controls with deflections up to 10 degrees, flow without separation, and for values of the ratio of control chord to aerofoil chord between 0.25 and 0.4. It is suggested that hinge bracket cut outs be ignored where the clearances are of the same order as the gap. A worked example illustrates the use of the data.Indexed under:
Details:
Data Item ESDU AERO C.01.01.04  

Format: 

Status: 

Previous Releases: 

ISBN: 

The Data Item document you have requested is available only to subscribers or purchasers.
 Subscribers login here.
 If you are not an ESDU subscriber you can
 find out how to subscribe, or
 purchase this Data Item from the IHS Standards Store.
Explore ESDU
ESDU Series:
 Aerodynamics
 Aircraft Noise
 Composites
 Dynamics
 Fatigue  Endurance Data
 Fatigue  Fracture Mechanics
 Fluid Mechanics, Internal Flow
 Fluid Mechanics, Internal Flow (Aerospace)
 Heat Transfer
 Mechanisms
 Performance
 Physical Data, Chemical Engineering
 Stress and Strength
 Structures
 Transonic Aerodynamics
 Tribology
 Vibration and Acoustic Fatigue
 Wind Engineering
ESDU Packages:
 Home  AZ index  Contact Us  Help  About Us  Terms of Use  Privacy Policy  How we use cookies  How to Subscribe 
© 19992019 IHS ESDU, part of IHS Inc.