Preliminary estimates of the flight parameters to be encountered on Mars and Venus. Although considerable qualitative information is available, there are few quantitative data that contribute to an understanding of the atmospheres. From the available quantitative data, limiting models of the two atmospheres have been constructed; and from these models have been estimated the approximate extremes of aerodynamic parameters likely to be encountered. It is seen that the uncertainties in aerodynamic flight conditions encompass orders of magnitude, particularly at high altitudes.
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