Unwinder UW2

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The unwinder (dereeler) UW2 is designed to facilitate the launching of lightweight radiosondes (such as the DFM-09 and DFM-06) under all weather conditions.  The UW2 is connected between the radiosonde and the balloon by a cord which slowly increases its length after release of the balloon.  The unwinding speed of the cord is controlled by a small rubber balloon which acts as a brake.