Air-cushioning effect and Kelvin-Helmholtz instability before the slamming of a disk on water

A solid plate about to slam onto a water surface makes it presence felt before the actual contact by squeezing out mediating air cushioning layer. This layer has regions of low and high pressures. At point (stagnation) pressure, is deflected away from impactor. While in pressure region, Kelvin-Helmholtz instability initiates suction towards Using new measuring technique we measure such deflections, order 10-300 microns, explain mechanisms driving them.