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Bought one last year and use similar to kbecker in back seat. They really knock the edge off while down low, usually turn off at altitude and back on for landing on cross country. Freezing blocks of ice in large Tupperware dish in addition to ice cubes really stretches the length of time these are useful. I bought the recharge unit with drill battery and turn on while pulling out and preflight to cool things off even earlier. They work!
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