| dc.description |
The usual technique of longitudinal stability analysis
is adopted but particular attention is paid to those elements
that contribute to damping, The cases of two delta plan form.
aircraft of 45° and 60° sweep angle are considered and, in the
light of the best available data, their derivatives and the
coefficients of the stability- quartics are obtained for a range
of Mach numbers including the transonic range. An analysis is
made of the damping of the short period oscillation in each case
and this is compared with a requirement to damp to half-amplitude
in less than one cycle. The results are dependent on estimates
and assumptions that cannot be regarded as completely reliable
in the absence of experimental data, and quasi-static derivatives
are used in cases where frequency effects should properly be
included; but the broad implications of the results are probably
acceptable. |
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