QUANTITATIVE TERRAIN STUDY OF VTOL LANDING SITE DISTRIBUTIONS AND OF EFFECTS ON PENETRATION.

摘要

A VTOL site is assumed to require a ground slope of 10% or less and be clear of trees. Also there can be no boulders over 2feet high or gullies deeper than 2feet. Single sites,if square,should be 200feet on a side and if circular 250feet in diameter. Assault sites,if square,should be 1500feet on a side and 2000feet in diameter,if circular. Probability distributions of distances to single and assault sites,based on a study of environmental literature,topographic maps and aerial photographs are presented for Thailand,India,Nevada,Italy,Germany and Alaska. A VTOL site may be expected within a few miles in all but the most unfavorable environments. Sites located on residual soils would seldom be too soft for VTOL operations,but alluvial soils should be avoided when poorly drained. Prior knowledge of analogous situations,aerial photography and direct observation provide the best information for evaluating candidate sites. (Author)