Offered by some guys I used to be stationed with in the Air Force, the SR-71, also referred to as ‘the Pick’, is a very specialized piece of kit used in airfield surveys.
It’s a simple soil strength surveying device used Internationally by Surveyors when assessing semi-prepared and un-prepared airfields. Individuals or a team of surveyors can quickly assess large areas and trouble spots / weak areas on an airfield by ‘picking’ the ground and checking top layers of soil for indicators of GO or NO GO criteria. This can save a lot of time as you may find that there’s no need to even break out the Dynamic Cone Penetrometer.
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