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The effect of dive recovery flaps on the lift of a two dimensional symmetrical airfoil with changes in chordwise location of the flaps


Kronmiller, George R. (1947) The effect of dive recovery flaps on the lift of a two dimensional symmetrical airfoil with changes in chordwise location of the flaps. Engineer's thesis, California Institute of Technology.


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It was desired in this investigation to determine the effect of the chordwise position of dive recovery flaps on the lift of a laminar flow, low drag, two-dimensional airfoil at high subsonic Mach numbers. Schlieren pictures were taken to relate the formation, extension and strength of shock waves to the measured lift. Tests were made on a four inch chord airfoil of section 65,1-012 at Mach numbers from .50 to .83, a Reynolds number of 1,600,000 at M[subscript o] = 0.7, angles of attack from 1 to 3 degrees, and flap locations at 15%, 30%, and 45% chord; the flap is 10% of the chord.

The investigation was carried out by the authors at the Guggenheim Aeronautical Laboratory of the California Institute of Technology during the school year 1945-1946.

It was concluded that dive recovery flaps materially increase the lift of an airfoil, and there is an optimum flap location for maximum lift and one for maximum […]. Moreover, it was concluded that the formation and development of shock waves is directly related to the lift, but that the successive development of the shock wave pattern as a function of Mach number is independent of angle of attack or flap location; the Mach number for initial shock formation varies. Finally, in this tunnel where the thickness of the boundary layer is a large percent of the tunnel width the correction for non-uniform spanwise lift distribution must be investigated more carefully before absolute lift values can be computed.

Item Type:Thesis (Engineer's thesis)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Liepmann, Hans Wolfgang (advisor)
  • Puckett, Allen E. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 June 1946
Record Number:CaltechETD:etd-11262008-112929
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4673
Deposited By: Imported from ETD-db
Deposited On:17 Dec 2008
Last Modified:26 Dec 2012 03:10

Thesis Files

PDF (Weitzenfeld_dk_1946.pdf) - Final Version
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