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National Advisory Committee for Aeronautics, Technical Notes - Summary of Revised Gust Velocity Data Obtained from V-G Records Taken on Civil Transport Airplanes from 1933 to 1950

This paper summarizes gust—velocity data obtained by reevaluating
the normal accelerations and airspeeds from.V-G records taken on civil
transport airplanes from 1933 to 1950. The reevaluation was made on
the basis of a "derived" gust velocity Ude: which is related to the
"effective" gust velocity Ue by a conversion factor that is a function
of the type of airplane and operating altitude. Although the value
of the conversion factor varies from about 1.6 to 2.0 for the data
presented, the conclusions drawn from the previously presented data based
on U (in particular, the relative levels of turbulence indicated
between different routes) remain essentially unchanged.

The National Advisory Committee for Aeronautics has for a number
of years made use of normal—acceleration and airspeed data from V-G
records taken during routine airline operations for determining the
intensity and frequency of occurrence of atmospheric gusts. Gust
velocities have been evaluated from these records by use of the gust-
velocity formula given in the list of symbols of reference 1. The values
obtained were expressed in terms of the "effective" gust velocity Ue.

Recently, a revised gust formula was presented in reference 2 together
with a discussion and comparison of the salient features of the old
and the revised formula. One of the primary features of the revised
formula is a new gust factor based on airplane mass ratio instead of
wing loading. The gust velocities obtained by this formula are given
in terms of a "derived" gust velocity Ude which for the same
turbulence yields numeriCally higher values of gust velocity. Since
the revised formula replaces the old gust formula in gust-load studies
and will be used in presenting future NADA gust research results, it
appeared desirable to convert the available statistical data from
terms of Ue to terms of the new gust velocity.

This report summarizes in terms of the derived gust'velocity Ude
the reevaluated data obtained from V-G records of civil transport air-
planes collected during the period from 1933 to 1950