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MPS or Gennaker Trim


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#1 Frank

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Posted 12 December 2019 - 04:22 PM

We used the MPS (do they still call them that ?) last Sunday, it was a broad reach and it would not set  presumably because it was blanketed by the main. The boat is masthead rigged and the tack was attached at the base of the pulpit, the boat not having a prod. The week prior we flew it with the wind just aft of the beam and it set perfectly. If we are not to fit a prod is the answer to use the spinnaker pole ? This would sort of defeat the purpose of an MPS for me, the sail is made by the Willis loft and its had little use so its mint, any suggestions ?


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#2 Black Panther

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Posted 12 December 2019 - 04:40 PM

Try easing the sheet quite a bit. It should float around in front of the boat and set. You can only probably get to about 150 apparent. After that head up till it sets and gybe when necessary.
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#3 Island Time

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Posted 12 December 2019 - 05:39 PM

A real MPS (multi purpose sail/spinaker) is nowhere near as versatile as a proper gennaker - Like an A2.

MPS is like a motor sailer - not great at either job.

An A2 will go from about 165 right around to about 70 deg apparent.   Neither sail works if you are really deep, then either take the main off, or use a pole (or a real Spin...)


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#4 Fish

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Posted 12 December 2019 - 07:58 PM

If you are set up with a tack line to your MPS, you can ease it a bit, this lets the luff roll up a bit, by easing the sheet as well it can all roll out to windward a bit, which will help (a bit). Short story though, is if you are too deep, the sail gets blanketed too much by the main, and, if you are too slow (which you will be if the MPS isn't pulling), then your apparent wind drops, and nothing works.

Probably the easiest thing to do is to come up (heat it up) until the sail is drawing well and you have good boat speed, then soak back down as far as you can while still keeping the sail flying and reasonable boat speed. The deeper you go (towards a flat run) the slower you will go and the shittier the sails will draw. But yeah, a proper gennaker will handle better (easier) and be faster. As already said, you can sail higher and faster and gybe down wind, just like a sport boat, or run a spinnaker on a pole, with all the incumbent pieces of string and what not.

 

I also run a gennaker off the bow (pushpit) but I got a proper one made and ditched the MPS I had, it was like trying to sly a brick...

Gennaker off the bow is nice and easy short handed and cruising. Spinnakers are faster, but a lot more work.


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#5 Frank

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Posted 13 December 2019 - 03:51 AM

Thanks for the help,  all good points, we are still figuring out the boat and rig so we will continue play around with it.

Setting it with a pole would be worth the hassle on a longer trip like to the Barrier etc.


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