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Old 25-10-2017, 00:06   #16
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Re: Catamaran keel feet / shoes

I seem to remember that Prouts used a GRP bonding paste, but personally I would use something like 5200 or a poly-sulphide. That way the joint has a bit of give / flex but is still plenty strong.

The Prout shoes were hardwood in order to allow then to absorb a degree of shock and point load from stones etc without excessive damage. They were intended to be sacrificial and to wear if the vessel was grounded frequently or kept on a drying berth.

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Dwayne
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Old 25-10-2017, 01:42   #17
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Re: Catamaran keel feet / shoes

There are several of Richard Woods's designs that have wooden skid strips/sacraficial keels. Including on a few of his boats which have daggerboards as well. Which, one of the latter has hardwood sacrificial keels bonded in place with Sikaflex. And she fully went over a reef with them, though there was some damage to the outer skins of her hulls.
IIRC they're about 3"x3' oak simply glue in place with Sikaflex.

What materials you use really boils down to how much money you want to spend, how much effort you want to put into mounting them, & how much extra drag you're willing to add to the boat. As FWIW you could even use some copper plate attached with bolts that you epoxy bond into the current keels. Copper being a lot easier to form than stainless, & obviously it shouldn't foul much with marine growth.

I don't know how flat, or curved the undersides of the current keels are, but another option is to either beef up the laminate down there by 10-15mm. Or bond on some G-10 or FRP plate, along with a bit of laminate to help affix it in place, & smooth out the joint where it meets the keels.
Simple to do, low cost, tough, low drag, adds to the structure of keels/hull in terms of strength.
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Old 25-10-2017, 01:45   #18
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Re: Catamaran keel feet / shoes

Google keel guards.

They are rubber pieces designed more for small go fast boats but should do the trick and be simple to install.
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Old 25-10-2017, 01:50   #19
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Re: Catamaran keel feet / shoes

I am looking for the same thing for a Lagoon 400.

I saw recently a L400 on the dry with a small keel damage in the front section,
where the gel coat is splintered away and the fibres of the fiberglass are exposed to the salt water. The keel was soaked and dripping for days. it seems the boat has hit a small metal buoy and the gel coat was just gone on this spot. A keel shoe of metal as shown in the video would have prevented the damage. A wooden shoe on the bottom would not have helped, because the hit was on the front lower edge, it is only good for beaching the boat.

A good protection should cover the front part and the bottom of the keel.

I hope somebody could produce this parts, they can be easily glued on with Sika to the keel. I would not bolt them on.
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