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It is entirely possible to bend the shaft if the props bottomed out, because the props are attached to the shaft. It is highly likely you have bent the propellor and possibly the shaft. Being that the motor is spinning up and the boat is not moving foward, you could have either stripped the keyway on the propellor or damaged the transmission and it is slipping with a heavier load on it. I would recommend getting a photo tachometer and checking the rpm's on the shaft at different motor rpms (such as 1500 rpm,s 2000 rpms, 2500rpms and 3000 rpms, and higher) and recording the readings and then multiplying the readings by the transmission's gear ratio to make sure the transmission is not slipping....... for example if the motor is at 2000rpms and you have a 1.5 reduction (gear ratio) the shaft speed should be 1,333.33 rpms
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