Patent ID: 9335230
Filing Date: 2016-05-10
CPC Classification: F41A,F42B,G01L

Claim Text:
1. A method of determining fluid pressure on a projectile launched from a tube, comprising: providing a projectile that includes a metallic cylindrical body wall and a central longitudinal axis, a portion of the cylindrical body wall having an outer diameter and a radial thickness; altering the portion of the cylindrical body wall by reducing the radial thickness and forming a plurality of indentations of known geometry on a radially outermost surface of the reduced thickness portion; fixing a metallic cylindrical sleeve over the reduced thickness portion, the cylindrical sleeve having a same outer diameter as the outer diameter of the portion of the cylindrical body wall; launching the projectile from the tube; deforming the cylindrical sleeve into the plurality of indentations on the reduced thickness portion to produce a deformed cylindrical sleeve; recovering the projectile; measuring deformations in the deformed cylindrical sleeve; and correlating the measured deformations to values of fluid pressure that caused the measured deformations.