Abstract
This paper describes onboard balance system used in the rocket sled test on the high speed test track. Newly developed acceleration-compensated balance mechanically cancels inertia force and enables us to use suitable size load cells for expected aerodynamic force. Lift force was evaluated by another internal 6-axis balance. With a flat plate and AGARD-B model, system verification tests were conducted to clear the accuracy of this system. Although the cancellation of the onboard G-force was almost accomplished, uncertainty of the wind speed or mechanical friction in the system caused severe error to the measured drag coefficient.
