Originally Posted by sea-bee
I am building a plywood
40' Snell Easy cat, and am currently working on the keels. The boat is designed to sit on the keels, and I am concerned about the abrasion that has been discussed.
What about fitting a "shoe" to the bottom of the keel
? The keels are timber and epoxy
coated, and I am thinking of taking them to a metalworker to have 316SS shoes made up now in 5mm plate, before the keel is fitted.
Would be real shame to throw away all your hard work, even if that was a long term thing (and likely the problem of a next owner). My answer would be to add something to the bottom of the keels, the question would only be what.
I certainly think that now (whilst still building) is the best time to address this, if you decide to.
If not simply layers of (sacrificial) fibreglass I would personally also look for something that could
later be removed and replaced (without chopping the keel(s) off!) - even if unlikely that it was you who would be doing that......but you never know!
In addition to the methods previously mentioned, have also seen folk using simple wood (hardwood) on keels as sacrifical strips albeit that mostly on smaller vessels (might be done on larger boats, just have never seen it).
One thing to bear in mind is if fixing via screws (or bolts) from underneath that can be source of water ingress, plus the heads are first thing to wear off!....have seen a few boats over the years where the keel bands dropped off!
Yesterday I took a few snaps of a Catamaran
that was parked a couple of boats along. Appreciate that a Catfisher is not exactly a performance boat!, but this is what has been done (no idea how old the keel bands are, but she has been a drying mooring
as long as I can remember).
The bar has been fixed on using simple welded on tangs (look closely and you can see the bumps) - possibly thru bolted (the usual MO) - and then glassed over.
A couple of of other Multihulls in the harbour (including a small(?!) Lagoon) - but they live in the muddy bit, so I won't be wading through the mud just to snap some pics! But I do that on occassion, so might snap some pics - if I remember
Would it be worth the effort and the $1000?
IMO, if beaching is intended on a regular basis (rather than occassionally to antifoul etc, in carefully chosen places) then I would. But I ain't claiming to be an "expert".
Of course nothing lasts forever - but I would prefer to replace a keel band than an inch or more of keel, on any sort of boat:-
This on a Wood Mono (keel is solid hardwood, dating from late 60's) - fitted around 20 years ago (by my Father - boat long since sold, to a succession of idjuts
), that would have been at least 1/4 inch steel
bar. Obviously rust would have played a part in it's present condition - but more about having been beached twice a day (drying moorings over here).