rudder blade

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Noun1.rudder blade - the vertical blade on a rudderrudder blade - the vertical blade on a rudder  
vane, blade - flat surface that rotates and pushes against air or water
rudder - (nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel
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Other innovative features include the integrated mechanical rudder stoppers, which are located between the rudder blade and (hull) skeg structure rather than on the outside hull due to the latters radical design.
Check for bearing play by pushing the rudder blade sideways.
It boasts a hull with rounded sides, a flat bottom and retractable centre-board and rudder blade so that the ice floes forming around it can slide beneath the hull and push the ship upwards rather than crush it.