Hi Cathy – all can be revealed.
As I sailed back from Aldernay at the end of last summer i noticed a slight crack in the GRP saloon roof alongside my maststep. After having unseen water ingress, (over many years I guess), via the bolts which hold the maststep down to the GRP pad on top of the saloon on my Twister, rot had taken place in supportive timbers below. Not a problem usually associated with Twisters.
Work done :-
* Routered out a lid from the GRP maststep pad and with the Fein Mulimaster, took out the infill of 30mm of soggy ply.
* Refilled the space with 5mm and 10mm sheets of polyester from a local catamaran builders, (the bits they cut out for the windows), and epoxied them back to the correct level with a couple of steel bars along its length to give more strength.
* Took out three supporting ash crossbeams with the Multimaster, one of which had nearly rotted through, (+ the top of two bulkheads below), and the upright posts with the Multimaster, which take the masts forces down to the keel area. Ash is not a good timber for this job.
* Remade the 60mm thick beams from well seasoned European oak, made up of 12 lamins/plys of 7mm thick each, in a gentle ark shape to match the cabin roof inside. How many tons is this now capable of supporting I wonder? I glued up the lamins for the beams onto a former, which was made using the old beams as a pattern, with 5min polyurethane glue using nylon nails in a nail gun. When put through a thicknesser and finished off the new beams were bonded back up to the inside of the cabin roof with epoxy mixed with microfibres.
* Put in new Utile support posts bonded to the bulkheads with 5min polyurethane, setting each post up into a housing joint in the beams and setting the bottoms of the posts down to strong areas at the keel.
* Replaced the through bolts for the maststep with studs epoxied in to stop water ingress. No real force need to be applied to the holding nuts as the weight of the mast etc will hold it all down.
* Reset the newly galvanised steel maststep back onto its pad with oil based builders mastic to ensure the load was well spread accross all of my new mastep pad. (Chose this type of mastic as it can be easily wiped off and cleaned up with white spirit.)
* Refilled some of the interior GRP moulding with car body filler and sanded to shape.
* Along with removing and refitting the front hatch, refitting the genoa tracks, and the other normal winter maintenance, I havn’t had time to fit my boat heater which was to have been the main task this lay up. All could have been done and finished in a week or so if the boat had been alongside a workshop, but at weekends with winter weather, flu bugs and being 80miles from the yard it made things a bit slower. The Multimaster enabled the work to be done far more easily and quickly however and I dread to think how I would have achieved most of the tasks without it and how long it could have taken.
* Just the ‘decorating’ to do now and oh! I forgot, I've just started to take the forecabin apart to sort out the lockers and.................... Scotty.