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When I say spring-loaded, I don't mean a conventional coil spring. There are many different kinds of springs. I mean that when the flap is pulled back, it returns to its position under on it's on when the vacuum is relieved.
And hyrdolock is when water is sucked into the combustion chamber. As the piston begins the compression stroke on the water-filled chamber, it is stopped because water doesn't compress like air does. So the force that was pushing that piston up (from one of the other pistons being pushed down during the combustion stroke) has to go somewhere. I'm not exactly sure what actual damage constitutes the term hyro-lock, but it could probably include anything from a broken crank to broken rods to a screwed head.
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