The cause was actually nothing to do with the Leisure Furl. The rigger had built the vang incorrectly so that it actually bottomed out and so I was simply crushing it as I pulled the vang line in. We had a better one built that had a longer lower support and more movement, and no problem since. I don't generally use the vang like it would be used on a monohull
, maybe just in a lighter wind
to steady the boom. The sail is flattened by furling
just a little as it pulls and flattens from the centre of the boom (mandrel).
My chief suggestion at this stage is to get the attachment height on the mast
correct. Mine should be maybe 40mm higher as in a rolling swell and light winds the boom can just hit my bimini
. I use the topping lift to support it and best is to use a preventer to keep the boom from slamming.
The L450 mast has quite a few degrees rake aft. 87 degrees is quoted and aim for that. However not as critical as you would think. I have only ever had problems with the sail moving forward on the boom when furling. This happens if the boom is too low, and/or there is any pressure on the sail. If I raise the boom when furling it prevents this and I have never even seen it try to move too far aft.
I still maintain that of all the improvements I have made on Magique this is by far the best for safety
and to get more sailing done.
Keep in touch.