Hi Scott,
We had something similar- bottom paint flaking back exposing bright metal on the keel and heavy corrosion on through hulls.  This could have been a stray electric current on the boat, and we found some wiring that was not as it should have been, but in the end we blamed stray currents in the marina (Spanish town in Virgin Gorda) and a badly corroded earth contact in our Shore power plug lead.  We also fitted a galvanic isolator on the shore power lead .  We have not had the problem to the same extent since, but do still sometimes get a paint blister on the lead keel which needs to be scraped back, primed, filled and painted.  Our SSB radio uses the keel as an earth, and I have heard it should have diodes isolating it, but our radio has such great range I am reluctant to change it....
Cheers,
Andrew Eagle, (Hylas 51 "Hanne Danske"

Sorry, here's a better photo. I don't know why the other one was truncated.

We recently hauled out in prep for Hurricane Irma.  Thankfully we did not get hit hard and no damage to the boat.   When we hauled, we found that the bottom paint on the keel was peeling off in round circles varying from maybe 1 to 8" in diameter.  The bottom was just done less then 4 months previous with Petit Ultima SR 60, a paint that has been very successful in our area (Beaufort SC).  Notably the hull paint looked great, the peeling was limited to the keel and around the through hulls.  Our boat yard is speculating that there appears to be some spots were the barrier coat on the keel  may have failed (just pin holes), causing a galvanic reaction between the lead keel and the metal in the paint.  Ultimately resulting in patches of paint pealing off. 

Was wondering if anyone else has experienced anything like this and if so what you may have found for a resolution.

Best Regards

Scott Johnson
L'ame Libre  H54 - #22

Hi
2 seasons ago I stripped out the reversible aircon/heating system and replaced it with a hydronic heating system. Live and sail in West of Scotland. After a long period of thought have Webasto 7.5kw heater on inside surface of starboard rear locker. I have a ventilated removeable cover installed over it. Exhaust facing amidships on rear steps.
Installed fan matrix heaters in saloon, rear and forward cabins and conventional radiators in both heads. Header tank is above calorifier in rear heads cupboard aft of engine. Need to be higher than all other components.
Although uses more electric power than a blown heat system it was easier to route pipes than ducting. Installed a speed controller for the main saloon heater to slow it down when cabin heated. Nice and quiet. The radiators in the heads are great for drying towels and clothes. I also changed out the calorifier to have 2 coils ( engine and heater) as well as electric immersion heater.
Incidentally, if you install a diesel heater do run it at least once a month for a short time whether you need it or not otherwise they tend to sieze up. This is from experience on past boats.
If you want more info just ask.

Andy
H46#32 True Brew

This is a problem that I've been struggling with as well along with mainsheet twist. Can't quite see from the picture attached exactly what is different to the normal rig, apart from running straight to the mainsheet winch over the aft cabin hatch. I've attached some pictures of an upgrade that has been sent to me from the US and I'm looking at heading down this route, but it does involve full replacement of existing gear. No idea whose Hylas 54 the pictures are from.

All best, DSH