Accession Number:

AD0733619

Title:

EinfluB der Fluegelstreckung auf Instabilitaet und AllpaBeffekte der Flugzeuglaengsbewegung (Influence of the Wing Aspect Ratio on Instability and Undesirable Non-Minimum Phase Effects on the Aircraft's Longitudinal Motion),

Descriptive Note:

Corporate Author:

DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V BRUNSWICK (WEST GERMANY)

Personal Author(s):

• Schaenzer,G.

Report Date:

1971-01-01

Pagination or Media Count:

5.0

Abstract:

In some aircraft disturbance and control transfer functions, a negative value for the term CL--CD alpha leads to instabilities and undesirable non-minimum phase effects. Reversal of the sign depends particularly on aspect ratio A for aircraft in landing configuration and occurs in the range A approx. 3. For the aspect ratio A 1, the approximation CL--CD alpha CL 1 - 3A is possible, which is sufficiently accurate for most applications in flight mechanics and flight control. Author

Descriptors:

• (*AERODYNAMIC CONTROL SURFACES
• AERODYNAMICS)
• (*WINGS
• *ASPECT RATIO)
• STABILITY
• PERFORMANCE(ENGINEERING)
• PITCH(MOTION)
• TRANSFER FUNCTIONS
• WEST GERMANY

Subject Categories:

• Aerodynamics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE