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尽管岩石的某些物理力学性质已被认为能在冲击钻进中给出钻速的估算，但作者的工作表明钻速和单个岩石性质的相关性是不明显的。作者提出了钻速和一系列岩石性质的良好相关关系，但是关系是复杂的。单位体积能已被哈斯特鲁利德（Hustrulid）和费厄赫斯特（Fairhurst）用作冲击钻进中钻速的量度，然而，他们的试验是使用实际尺寸钎头的大装置。作者用顶角为110°的尖锐微型钎头，在简单的实验室落锤装置上，以最佳的转角确定了各种岩石的最小单位体积能Evmin。发现这个Evmin与可控制的实验室中，钎头不同的摩损阶段钻进不同岩石所取得的钻速相关很好。提出了一个钻速和Evmin的综合关系。
Although some of the physical and mechanical properties of rocks have been considered to give an estimate of the drilling rate during impact drilling, the authors’ work shows that the correlation between the rate of penetration and the individual rock properties is insignificant. The authors propose a good correlation between the rate of penetration and a series of rock properties, but the relationship is complex. The unit volume has been used by Hustrulid and Fairhurst as a measure of the penetration rate during impact drilling, however, their test is a large unit with a real size drill bit. Using a sharp miniature drill bit with apex angle of 110 °, the authors determined the minimum unit volume energy Evmin for the various rocks at the optimal turn angle in a simple laboratory drop unit. It was found that this Evmin correlates well with the rate of penetration achieved by drilling different rocks at different stages of framing in a controlled laboratory. Propose a comprehensive relationship between drilling speed and Evmin.