Tartan 27' owner
Join Date: Jan 2008
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We keep our 7000+ # 27' boat on a similar arrangement only we use a 250# mushroom in the Hudson which has a more muddy, clay-like bottom. I'm pretty sure we use 20' of 5/8" chain and 20' of 1/2" chain in about 18' of water as dictated by the club mooring rules. I know that this largely violates the rule of 'scope' but our mooring field is fairly small so boat swing area is minimized in order to get more boats into the area available.
A 500# mushroom should hold a pretty heavy boat in moderate conditions and most 30' boats in our club would be happy to have that as their mooring anchor since many use just a 350# or so.
As an aside I'll note that the weather that just blew through here brought some 40 knot gusts to our mooring field. One or two boats got away from their moorings - chafed pendants, weakest link etc. Our boat is still on her mooring.
I would not worry about the rust on the shaft of your mushroom. While storing the chain over the winter we have found that coating it with vegetable oil (or any food oil for that matter) can help keep it from oxidizing (eg., rusting). I'm not sure if that would help your rusty mushroom though. Perhaps some Naval Jelly (phosphoric acid) would stem the rust a bit.
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Last edited by CalebD; 10-03-2010 at 06:01 PM.