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Re: pic: 121 Teaser
Logic says that since only about 10% of the chain is resting on the sprockets, then this is not the actual pivot point for the chain. I believe it is just a chain tensioner we are seeing to reduce flex in the actual chain run. It looks like the actual load bearing drive sprocket would be about a foot (or more) in diameter and located inside the limits of the chain guard guard that is showing in the top right?
As for it's application? I don't know.
Lifting relatively small (as far as Navy boats go) boats out of the water?
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