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Given the issue with the boom height (I cant stand upright beneath it) we agreed that indeed a sloping section could be manufactured to provide a roof extension to the bimini and thus create a full enclosure.
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The boom height over the cockpit is adjustable !!
When I bought my B36(2002) it was second hand and was an ex charter boat where it’s main sail may or may not have been the original. The main sail was quite old, worn, arguably stretched, and had definitely seen better days, and I at 5’10.5” in height could also not safely stand under the end of boom. Knowing that the existing main sail was in poor shape, I ordered a new main sail from measurements that I took, and where the end of the boom was raised just sufficiently to allow me to stand at full height under the end of the boom and with a couple of inches clearance in order to remove the risk of an accidental headache.
I can appreciate that you may be taller than me, and that you may already have a virtually new sail and don’t want to have to spend out a large sum of money on a new sail just yet, but you can get your sailmaker to make adjustments to it for a whole lot less money than the cost of a new one. Prior to buying my new mainsail I had discussed my intention with a more experienced yachty neighbour, and he had held up his hands in shock horror at the thought, and argued that I’d lose out dramatically on performance etc., but it was all bluster and negative thinking. If there has been a loss in performance, it has been more than made up for by careful trimming of the sails.
At the end of the day what you need is a boat you can sail safely without the risk of getting your head smashed in during an inadvertent gybe.
As for the full cockpit canopy, I bought one from C&J Marine in the UK, and without doubt it has been one of the best and most useful additions to my boat, but raising the end of the boom has to be the safest modification so far.