Join Date: Mar 2006
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Here's another possibility. If you can be sure that the stern area will hold air pressure (you might have to block off some holes) you could then pump compressed air in and force the water out. It should only take a few PSI at low tide to get the water to exit the aft section of the hull and add buoyancy back to the stern. The boat looks to be only sitting in 3-4 feet of water at low tide so if you can get enough lifting at the stern to pump out the rest of the boat it might just float free at high tide (you mentioned you get 5' of tide rise).
I still would not try to pull the boat anywhere without getting it floating first. 13000 lbs won't be easy to budge, you would likely damage the hull and the boat might sink further depending on how you move it. You mentioned turning the bow toward the shore earlier; but if the stern is sitting down and the bottom of the river is sloped, the stern will sink in further when the boat rotates.