FLIGHT TEST OF A TOWBODY FOR AN AIRBORNE VERTICAL SQUID GRADIOMETER

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Authors
  1. Wilson, H.
  2. Dustan, B.W.
  3. Religa, R.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
We present the results of a flight test of a towbody for a vertical-dewar superconducting magnetic gradiometer. The towbody is basically a vertical circular cylinder: ie.e. a nonlifting body in a crossflow. For this test, the towbody was instrumented with a 3-axis linear accelerometer and a 3-axis vector magnetometer to measure accelerations, magnetometer slew rates and towbody orientations. The test results are presented as plots of acceleration spectra and tables of pitch, roll and yaw amplitudes. The flight test also revealed two aerodynamic instabilities: a pitching instability occured near 45 knots and a roll/yaw instability appeared above 70 knots. The report concludes that the towbody is suitable for a test of the superconducting gradiometer in spite of the pitching instability, but that the airspeed will have to be kept below 65 knots. An Appendix gives the algebra involved in the data analysis.
Keywords
Crossflow;High angle of attack;Gradiometers
Report Number
DREA-TM-97-212 — Technical Memorandum
Date of publication
01 Jan 1997
Number of Pages
23
DSTKIM No
98-00405
CANDIS No
507004
Format(s):
Hardcopy;Document Image stored on Optical Disk

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