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An Investigation of a Method of Underwater Propulsion by Direct Gas Injection


Baranowski, John J. and Seiler, Dayton A. (1944) An Investigation of a Method of Underwater Propulsion by Direct Gas Injection. Engineer's thesis, California Institute of Technology. doi:10.7907/XDF1-M512.


This report presents the results of an investigation of a method of underwater propulsion. The propelling system utilizes the energy of a small mass of expanding gas to accelerate the flow of a large mass of water through an open ended duct of proper shape and dimensions to obtain a resultant thrust. The investigation was limited to making a large number of runs on a hydroduct of arbitrary design, varying between wide limits the water flow and gas flow through the device, and measuring the net thrust caused by the introduction and expansion of the gas.

In comparison with the effective exhaust velocity of about 6,000 feet per second observed in rocket motors, this hydroduct model attained a maximum effective exhaust velocity of more than 27,000 feet per second, using nitrogen gas. Using hydrogen gas, effective exhaust velocities of 146,000 feet per second were obtained. Further investigation should prove this method of propulsion not only to be practical but very efficient.

This investigation was conducted at Project No. 1, Guggenheim Aeronautical Laboratory, California Institute of Technology, Pasadena, California.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:(Aeronautical Engineering)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Dunn, Louis G.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 June 1944
Record Number:CaltechTHESIS:09252015-133043910
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9177
Deposited By: Benjamin Perez
Deposited On:25 Sep 2015 20:57
Last Modified:10 Nov 2023 17:56

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