231. Electronic Methods of Weight and Thrust Measurements and Calculations as Used in ICBM Facilities


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R J Carleton: 231. Electronic Methods of Weight and Thrust Measurements and Calculations as Used in ICBM Facilities. 1959.



This paper discusses that in the static firing of missiles it is desired to measure the engine performance in all six components of force, thrust, pitch, roll, yaw, side X, and side Y forces. Additionally, in the tanking of liquid fuel rockets it is necessary to load a precise amount of fuel and oxidizer into the missile. While in flight tests the empty weight of the missile is also required along with the exact weight of fuel and oxidizer.
The paper then goes on to describe the different electronic load cell systems which are used to come up with the most accurate weight values. Launch Pad Force Measuring Systems are used for ballistic missile fueling, static engine testing, and flyaway firings. A combination static and dynamic design, such as that used for Atlas ICBM, measures not only the magnitude and direction of thrust but also records the side forces and moments. A Six Component Force System computes the thrust, pitch, roll, yaw, and side forces from load cell signals. A Precision Servo Weight Instrument System is used for measurement (to the nearest 50 lbs) of the missile empty weight, monitoring of fuel and oxidizer loading, and the take-off weight.
Finally, this paper is concerned that in order to be successful a Field Standard Calibration System should be in place and should be easily transportable. This is pertinent in providing frequent and reliable calibration checks of the Weight Instrument System.
In conclusion, with the systems for weighing and the field standards for calibration, it is felt that it is possible to weigh with great confidence to accuracies much better then 1/ 10% of the take-off weight of the missile.


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