Multiple Pulsejet Boring Device
A method and device for boring a hole  through a material along a desired path includes an umbilical subsystem  connected to a boring subsystem  having a plurality of pulsejets . These pulsejets  repeatedly receive and ignite a combustible fluid  in a combustion chamber  causing a portion of the fluid  to be forced out of a nozzle  at high speeds as a fluid slug  that impacts materials ahead of the pulsejet . A controller  controls the amount of fluid provided to each pulsejet , and the firing timing, thereby controlling the intensity in which each slug  impacts the material. By modulating the intensity and firing sequence of each of the pulsejets , material ahead of the boring subsystem  is differentially bored thereby allowing steering of the boring subsystem .
W. A. Berger et al., "Multiple Pulsejet Boring Device," The Curators of the University of Missouri, Jan 2009.
Mining and Nuclear Engineering
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