• Version
• 213 Downloads
• 1.17 MB File Size
• 1 File Count
• November 2, 2016 Create Date
• November 2, 2016 Last Updated

National Advisory Committee for Aeronautics, Report - A Revised Gust Load Formula and a Reevaluation of V-G Data Taken on Civil Transport Airplanes from 1933 to 1950

A revised gust-load formula with a new gust factor is derived
to replace the gustrload formula and alleviation factor widely
used in gust studies. The revised formula utilizes the same
principles and retains the same simple form of the original
formula but provides a more appropriate and acceptable basis
for gust-load calculations. The gust factor is calculated on the
basis of a one-minus-cosine gust shape and is presented as a
function of a mass-ratio parameter in contrast to the ramp gust
film?“ and wing loading, respectively, used for the alleviation
actor.

A summary of gust-velocity data from V-G records talren on
civil transport airplanes from 1.933 to 1950, re-evaluated by the
revised formula is also presented. The results indicate that
the conclusions drawn from previously presented data based on
the original formula (in particular, concerning the levels of
evaluated gust velocities between different routes) remain
essentially unchanged. The Nationdl Advisory Committee for
Aeronautics will make use of the revised gust-load formula in
the evaluation of relevant gust data.

A gust-load formula, embodying a number of simplifying
assumptions, has long been used in this country for the
calculation of design gust loads on ordinary airplanes by
military and civilian regulating agencies (see, for example,
ref. 1). This formula was developed and has been utilized
by the NACA in the evaluation and interpretation of gust
and gust-loads data obtained from measurements of accelera—
tions and airspeeds experienced during routine and some
special flights through turbulent air (see, for example, refs. 2
to 7).