Erosion tests performed on a particulate material in a 10−4 mm vacuum indicate that the volume of material eroded is directly proportional to the thrust level, and inversely proportional to the square root of the height above the surface. By assuming that the volume eroded is also directly proportional to the thrust duration and applying this law to the size of the crater formed during the Surveyor V vernier engine firing, indications are that during LM landing a crater would be eroded which estimates show would be 60 in. in diameter and from 1.6 to 2.5 in. deep:

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