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Analysis of an Inclined Thrust Axis as Applied to a Ramjet Propelled Aircraft


Welch, Frank (1950) Analysis of an Inclined Thrust Axis as Applied to a Ramjet Propelled Aircraft. Engineer's thesis, California Institute of Technology. doi:10.7907/T1QH-QJ51.


The low values of lift-drag ratio attained by supersonic wing configurations provide the opportunity for the utilization of an inclined thrust axis. The exhaust jet of a ramjet propelled aircraft is inclined in order to use some of the jet force to supply additional lift. This has the effect of augmenting the lift by the relatively large sine component of the jet force whereas the thrust in the flight direction is reduced only by the smaller change in the cosine component. It was found that this principle offers a substantial decrease in fuel consumption over that of a normal ramjet for probable values of lift-drag ratios above Mach number 1.5. Almost all of the possible decrease can be obtained with jet inclination angles of 15° or less.

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):
  • Tsien, Hsue Shen (advisor)
  • Marble, Frank E. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1950
Record Number:CaltechETD:etd-03162009-142841
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:971
Deposited By: Imported from ETD-db
Deposited On:17 Mar 2009
Last Modified:21 Apr 2023 00:06

Thesis Files

PDF (Welch_f_1950.pdf) - Final Version
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