Idiot made leak (me)
This applies to the MacGregor 26M.I hate holes through the hull. Thus I went to great lengths to siting the transducer for the depth sounder and decided to try it on the inside of the hull, above the water ballast tank.The reasoning is that when powering, rudders and board have to be up, and so draft is about 20" (to bottom of outboard engine), and when sailing, the water ballast tank is full.I ended up using some plastic waste pipe and creating my own mounting, as the one I bought was not suitable. However, I wanted to support it whilst the plastic padding to hold it in place set, and provide some support at the top end.Thus, I fixed a P clip to the longitudinal fibreglass stiffening member; drilled two holes but only used one.After the first trip, there was water in the bilge - quite unusual. Turns out that the longitudinal member is part of the water ballast. Holes plugged with stainless steel screws and silicone sealant.As far as I can tell, there is no mention of the fact that this stiffening member is full of water as part of the ballast system in the handbook, which is why I have written about it here - to save anyone else from making the same mistake.The only other time I have had water in the 26M is in a following sea - I think it goes up the bilge pump outlet. Round here, the water is shallow and so you can get quite steep short waves, especially in a force 7 from the WSW - fetch is 3000 miles all the way to the (US) East Coast. I would be interested if anyone else has experienced this, and if anyone has got a fix.