LM 30 & 32 Stay adjustment, trim guide

[chrismunson]

Answering my own question from a while back, attached is the trim and sail balance guide that came with the boat. It appears the mast should be vertical, with a 5 to 10 cm bend to it. The guide states the mast must be perpendicular to ship-side, with a 5 cm bend at the cross trees. I'll take this to the rigger, but seems it will be like bending a telephone pole! Nice that they go all the way up to 55 knots wind speed in the sail plan table.

LM32 Trim Guide.pdf (642.06 KB)

[Brian & Glenda]

Very interesting! When I opened your attachment I was surprised to see that your chart has the same handwritten notes on it as the one that came with our boat. Then I noted the header line.

Our boat came with a sail bag that had the name Barnett on a tag attached to it, and we bought the boat in Victoria B.C. It appear that your sail trim chart is most likely, a copy of the one on our boat, and confirms that the name of the previous owner of my boat was most likely Barnett!

We bought our LM32 through a charitable organization that it was donated to, and we were unable to find out through that organization, any information about the boat's history. It came without any manuals or documents other than the chart plotter manual and this chart. I'm curious to know if this chap offered you any other documents or advise that may be related to my boat. I always wondered how an LM got to the west coast of Canada. I now know that Barnett had the boat in Victoria in 2001.

The calculations I offered in my reply to your earlier post regarding new sails for an LM32; offering advice about how much to furl a 150 genoa to gain the target sail areas for various wind conditions, are based on this chart and the sail areas offered by various sailmakers for Genoas 1, 2 and 3 for LM32s.

May I suggest however, that while the chart answers any questions about mast bend, and states that the mast must be perpendicular to the ship sides; it does not discuss mast rake - or fore and aft lean before being bent. I still wonder if there is supposed to be any rake on our LM32 masts, but as our boat points quite well in most wind conditions, at the rake our mast is currently set at; and as our mast does not have an adjustable backstay; I don't think I'd change its rake even if I knew it was supposed to be something different. (I've never suspended a plumb bob off from the mast head to find out if it is raked.)

It's a small world!
Cheers,
Brian.

[chrismunson]

Hi Brian,

I have the electrical diagram if that's of use. Its not totally accurate. I replaced the horrible switch panel with a new breaker panel set under the wheel, where it is accessible. All the gauges and electronics have been replaced with newer equipment, I don't have those. My boat was sold by Anchor Marine in Michigan, I am not sure how it got to Connecticut, where I bought it from the 2nd owner in 2002. Still on original sails and MD17D engine. Basically LM laid out a wire harness and some pipes and then built a boat around it - this stuff can be pretty hard to work with!

[jandane]

Chrismunson. The most correct way to do the mast curvature trim, is to place it upright, let it lean backwards a little. There should be 15 cm measured from the top to deck. Then you tighten the front and rear stay, keeping the inclination. After that, tighten the outer stays. Then with the front, inner stay, you tighten up, making the mast curve forward on the middle. Being satisfied with this, you tighten the rear inner stay, but not as much as the front inner. Just “adequate” for the mast to fall out a little