A FMMM INVESTIGAMlIT OF. THE MEM2 OLOGICAL CONDITIONS COXUI TO ACRMLAFT ICInG

Meteorological data from flight observations in icing condi-tions during the winter of 1946-47 are presented, Data on liquid water content, temperature, and mean-effective drop diameter are shown to be consistent with ve4ues previously proposed for maximum icing conditions. Data on drop-size distribution as obtained by the rotating-cyli-nder method, although consistent with measurements previously made, were found. to be inconsistent with data on drop-size distribution derived. from the ratio of the maximum diameter to the mea?-effective diameter when the maximum &iameter was calculated. from the area of impingement on a stationary cylinder. Tae relation between temperature and. maimvm lquid. water content in layer clouds is discussed. and. estimates are given for the highest values of water content to be xpeocted. in layer clouds at various temperatures. INM0DUCTION Over a period of several years, the NACA has conducts & research on the prevention of ice formations on aircraft through the use of heat. She present phase of this research is Intended, to provide a fundamental understanding of the process of thermal ice prevention and thereby p~romote improvement in the design of thermal ice-prevention " *.'ULewis, U.8. Weather Bureau, has been assigned to work in collaboration with the staff of the Ames Aeronautical laboratory........h NAA icing resear h-pogram...............--2w. Kline, U.S. Weather Bureaus habsbeerf assigned to the Fligh