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A Brief Note on the Effect of an Offset Thrust Line on the Longitudinal Static Stability of an Aeroplane

Published online by Cambridge University Press:  04 July 2016

B. N. Tomlinson
B. N. Tomlinson*
Affiliation:
Royal Aircraft Establishment
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Extract

If the thrust line of an aircraft does not pass through the centre of gravity, the offset will introduce a pitching moment whose variation with speed and incidence perturbations will affect the stability characteristics of the aeroplane. Both Duncan and Etkin discussed the influence of the propulsive system on longitudinal static stability, but Duncan's analysis for an offset thrust line is not correct and Etkin restricted consideration of thrust effects on static stability to angle-of-attack disturbances at constant speed. The following remarks have been written, therefore, to clarify the effect of an offset thrust line on an aeroplane's static stability. Consideration is first given to what is meant by static stability, and then the part played by the thrust term is examined.

Type
Technical Note
Information
The Aeronautical Journal , Volume 69 , Issue 656 , August 1965 , pp. 573 - 574
Copyright
Copyright © Royal Aeronautical Society 1965

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References

1.Duncan, W. J.The Principles of the Control and Stability of Aircraft, p 145. Cambridge University Press, 1952.Google Scholar
2.Etkin, B.Dynamics of Flight, p 70. John Wiley, New York, Chapman & Hall, London, 1959.Google Scholar
3.Hopkin, H. R. and Thomas, H. H. B. M. The Development of Control Criteria. ARC 24 277, November 1962.Google Scholar
4. Royal Aeronautical Society. Data Sheet Aerodynamics Vol. 3 Aircraft 00.00.02.Google Scholar
5.Tomlinson, B. N. An Extensive Theoretical Study of the Ability of Slender-Wing Aircraft to Perform Sidestep Manoeuvres at Approach Speeds. ARC R&M 3359, Aug 1962.Google Scholar