ESTIMATION OF STABILITY DERIVATIVES FROM THEORY AND FLIGHY TEST FOR A TANDEM HELICOPTER IN FORWARD FLIGHT

摘要

This paper describes theoretical and flight test estimation of the stability derivatives considered necessary for a first approximation to the dynamic characteristics of a tandem helicopter in forward flight. These derivatives may be used with linear equations of motion. An example is presented to show the validity of the approximation. Comparison of analog computer solutions and flight test time histories shows that a first approximation is obtained. A refinement of the derivatives provided a better approximation.