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The High Speed Water Tunnel three-component balance

Hotz, G. M. and McGraw, J. T. (1955) The High Speed Water Tunnel three-component balance. California Institute of Technology , Pasadena, CA. (Unpublished)

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An experimental program was initiated in the High Speed Water Tunnel to measure force coefficients for hydrofoils under cavitating conditions. This program necessitated either a new force balance or a major modification of the existing one. Various balance configurations and pressure seal designs which were considered are described. A balance modification design was selected which consists of an appendage bolted between the existing balance and the water tunnel working section. This appendage alters the basic geometry of the force balance so that the model is now mounted on a parallelogram linkage instead of on a simple pivoted lever. The addition of the parallelogram force table suspension to the old balance renders the modified balance unresponsive to moments which in the old balance, interacted with forces and resulted in errors in the force readings. This modification which is described in detail was accomplished and resulted in a successful force balance capable of accurate measurement of forces on cavitating and noncavitating hydrofoils; and, in fact, it is expected to replace the old force balance for all force measurement work in the High Speed Water Tunnel. The cost and construction time for the balance modification were considerably less than would have been required for an entirely new force balance of comparable accuracy and sensitivity.

Item Type:Report or Paper (Technical Report)
Additional Information:This work was carried out under the Bureau of Ships Fundamental Research Program, Project NS 715-102, David Taylor Model Basin. Department of the Navy, Bureau of Ships Contract Nonr-220(12).
Group:Hydrodynamics Laboratory
Funding AgencyGrant Number
Department of the Navy, Bureau of ShipsNonr-220(12)
Department of the Navy, Bureau of ShipsNS 715-102
Record Number:CaltechAUTHORS:HydroLabRpt-47-1
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12476
Deposited By: Archive Administrator
Deposited On:10 Dec 2008 21:24
Last Modified:03 Oct 2019 00:28

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