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Mast Repair
Len wrote:
It worked fine for me... The pictures were a bit blurred but it seems the part that is connected (mastfoot?) could be drilled loose and you could a) use slightly bigger (thicker) rivets on the old places and b) drill a new hole next to the one ripped open. After looking at the damage, I'd be concerned about the end of the mast opening up slightly and coming off the step on the edge of the mast foot casting. If this starts to happen, total failure could occur in a very short time with the mast wall peeling back as it is forced over the foot like peeling a banana. How far it will go and is the rig going to stay up are the critical questions. I'd NOT be happy with just re-riviting it. You cannot effectively weld many grades of cast aluminium. If you are going to have this welded, ONLY GET THE CRACKS WELDED. The foot casting should still be fitted with rivits. The damaged area should be sleeved with a rivited on sheet of aluminium on the outside extending a couple of inches up the mast and the new holes for the foot drilled through this and the mast wall. This will prevent it spreading as described above. To shape aluminium sheet to fit, it will have to be annealed. Ideally it would be heat treated to harden it before riviting it in place but some alloys age harden to a fair extent at room temperature. Best talk to a rigger. If you DIY this, you NEED to use Duralac on the rivits and all surfaces in contact unless you are using a structural adhesive. If you have enough thread left on your turnbuckles to take up half an inch and still have plenty of range for adjustment, cut off the damage and have done with it. I would only raise the tabernackle as a last resort. -- Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED) ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL: 'Stingo' Albacore #1554 - 15' Early 60's, Uffa Fox designed, All varnished hot moulded wooden racing dinghy. |
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