QUANTITATIVE TERRAIN STUDY OF VTOL LANDING SITE DISTRIBUTIONS AND OF EFFECTS ON PENETRATION.
Final rept. 1 Jul 66-30 Jun 67,
CORNELL AERONAUTICAL LAB INC BUFFALO N Y
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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 2 feet high or gullies deeper than 2 feet. Single sites, if square, should be 200 feet on a side and if circular 250 feet in diameter. Assault sites, if square, should be 1500 feet on a side and 2000 feet 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
- Soil Mechanics