Propeller drive sleeve with asymmetric shock absorption

In a marine drive comprising a propeller with a hub, and an axially extending propeller shaft, a shock absorbing drive sleeve in said propeller hub and mounting said propeller hub to said propeller shaft and having an asymmetric spring rate such that said sleeve has a higher spring rate in one direction of rotation of said propeller shaft than in the other direction of rotation of said propeller shaft, said sleeve absorbing shock by permitting said propeller shaft to continue to rotate to a further rotated position than said propeller hub when said propeller strikes an object, said sleeve mounting said propeller hub to said propeller shaft in asymmetric relation such that in one direction of rotation, when said propeller strikes an object, said propeller shaft continues to rotate in said one direction of rotation through a first rotational angle to a further rotated position relative to said hub, and in the other direction of rotation, when said propeller strikes an object, said propeller shaft continues to rotate in said other direction of rotation through a second rotational angle to a second further rotated position relative to said hub, said second rotational angle being greater than said first rotational angle, said sleeve having an unloaded position between said first further rotated position in said one direction of rotation and said second further rotated position in said other direction of rotation, said sleeve having first and second shoulders spaced by respective first and second gaps from said hub in said unloaded position of said sleeve, said first gap being smaller than said second gap and enabling said second rotational angle in said other direction of rotation to be greater than said first rotational angle in said one direction of rotation.