CoA. Aero Notes (1963-1975)

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Browsing CoA. Aero Notes (1963-1975) by Author "Kumar, P. E."

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    The College of Aeronautics whirling arm initial development tests
    (College of Aeronautics, 1967-05) Kumar, P. E.
    The old Whirling Arm o-r the National Physical Laboratory has been re-erected at the College to provide a facility for the study of ground effect on wings, and other craft operating near the ground. The model is mounted on struts, which differ considerably from those used by N.P.L., and moves over an adjustable floor in a specially constructed Channel. This note covers the initial tests conducted on the arm towards making it a fully operational facility. It-is concluded that a full yaw-meter survey is necessary to define the air-flow existing in the channel, during operation of the arm, and that the instrumentation being used needs to be further developed.
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    Development of a 3-component strain-gauge for use on the whirling arm
    (College of Aeronautics, 1969-10) Holloway, W. G.; Kumar, P. E.; Osbourn, W.
    This note covers the development of two strain-gauge balances for use on the Whirling Arm Facility of the College. The main requirements for this balance were:- (a) to withstand 700 lbs of sideload without it interfering with the lift, drag and pitching moment measurements, (b) to have a high sensitivity without too heavy a structure. The balance originally designed for this purpose proved to be unacceptable because of undue interference due to sideload and the non-repetitive nature of its calibration curves. With the information gained from this first balance a second balance of exceedingly simpler design, was manufactured and was found to give good calibration curves and sensitivity, with little interference from sideloads. A trouble free method of recording the signals from the strain-gauge bridges is being developed and should be operating within the near future. It concluded that a new model, with its c.g. lying on the transverse centre-line of the balance, will be needed if sideload interference is to be further reduced.