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<p>or <a href="page.php?w=turboprop">turboprop</a> engine to drive two propellers in opposite rotation. Contra-rotating propellers are also common in some marine transmission systems, in particular for large speed boats with planing hulls. Two propellers are arranged one behind the other, and power is transferred from the engine via <a href="page.php?w=planetary_gear">planetary gear</a> <a href="page.php?w=Transmission_%28mechanics%29">transmission</a>. The configuration can also be used in <a href="page.php?w=helicopter">helicopter</a> designs</p><p>
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