NASA Technical Paper 2256 - CAFE Foundation

APPENDIX
base. Becauseof these shortcomings in the dial indicator methodof waviness measurement,
the data are defined as "indicated" waviness.
The indicated waviness data measuredon the airplanes tested are presented in
figures A2 through A7. Table AI is a summaryof the waviness data in terms of the
numberof waves at each location and the chordwise position, double amplitude, and
wavelengths of the largest wave in * _e laminar region and over the total chord at
each spanwise measurement location. Only waves that were-2 in. or shorter were
counted; most waves fell in this category. Waves which occurred in the turbulent
region of the chord were included in the table as an indication of-overall surface
quality. The maximum allowable multiple wave heights are also given in table AI. A
comparison between the maximum measured and maximum allowable wave heights shows that
the waves existing in the laminar region of all but one of the test airplanes were
smaller than allowable for premature transition.
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