Jonah,
On my 50' alloy (motorsailer) cat which has a cruising displacement of about 10 tons the main anchor is a 33kg Rocna (not a Rocna "type" e.g. Manson - a cheap knockoff copy) on 60 m of 10mm chain and 90 m of rope. For secondary anchors I have a Fortress FX 55 with the flukes set at 45 deg for mud, and a Spade A 140 as a general backup. Both of the alloy anchors have 15 m chain + rope rodes and are light enough to deploy/retrieve from the RIB if need be. The main anchor is operated from a Muir vertical windlass with a rope/chain gypsy and the secondary anchors use its vertical capstan and a separate bow roller. I prefer steel for the main anchor though, and have heard anecdotal reports of alloy shank failures in the Spade (the steel version of which I used with great success on my last cat). I don't know if your cat has sails, but if so one of the primary winches can usually be pressed into service in the event of a windlass failure.
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Jonah,
On my 50' alloy (motorsailer) cat which has a cruising displacement of about 10 tons the main anchor is a 33kg Rocna (not a Rocna "type" e.g. Manson - a cheap knockoff copy) on 60 m of 10mm chain and 90 m of rope. For secondary anchors I have a Fortress FX 55 with the flukes set at 45 deg for mud, and a Spade A 140 as a general backup. Both of the alloy anchors have 15 m chain + rope rodes and are light enough to deploy/retrieve from the RIB if need be. The main anchor is operated from a Muir vertical windlass with a rope/chain gypsy and the secondary anchors use its vertical capstan and a separate bow roller. I prefer steel for the main anchor though, and have heard anecdotal reports of alloy shank failures in the Spade (the steel version of which I used with great success on my last cat). I don't know if your cat has sails, but if so one of the primary winches can usually be pressed into service in the event of a windlass failure.
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