When rotary selector knobs are used on missiles, their setting may be altered by in-flight vibrations. The probability of a setting being changed is reduced as torque, on the selector shaft is in¬creased. It was the purpose of this study to determine the maximum torque which can be used with varying sized knobs. A previously recommended resistance for rotary selector knobs was 48 ounces. This study evaluated resistances well above this figure.
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