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Post by needforspeed on Nov 17, 2021 3:35:59 GMT
Hi Everyone I am new to the forum, but have owned a Windrider 17 for around 10 years. Lately I have been participating in some social racing and have been doing a few things to try and increase speed and pointing ability.
I would like to experiment with some mast rake changes, and I would like to hear from people what their experience has been. Its difficult to find material on the net on mast rake for small trimarans, so Lately I have been looking at some Hobie cat forum posts hoping that similar techniques on the cats would translate to the Windrider 17.
Regards Colin
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Post by Richard Isaac Ceballos on Dec 8, 2021 16:03:29 GMT
A pole indicated that a 6 degree mast rake is desirable. So I added a long shackle at the bottom of my 2014 WR17 forestay to achieve 6 degree mast rake. (see STAY TENSION?)
I have been waiting for the more experienced race sailors to respond to your question. They haven't yet, so I would like to comment.
According to (SAIL POWER the complete guide to sails and sail handling) Pg. 143: Increased mast rake increases windward helm and improves sailing to windward (reaching or pointing). Decreased mast rake increases lee helm and improves sailing down wind (running).
In addition to adjusting my mast rake to 6 degrees I also added aft stay adjusters that take up the slack on the back stays and increase the mast rake when sailing up wind. They are lines from the center stay rings, through turn blocks on the aft aka plates, to cam cleats near the pilot seat. This provides a way to adjust mast rake while sailing. (see Back Stay Adjusters)
richard.
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Mast rake
Jan 8, 2022 17:29:07 GMT
via mobile
Post by bwoods on Jan 8, 2022 17:29:07 GMT
Hi, Richard,
I once saw stay adjusters via a block arrangement lime a vang or mainsheet.
Does your line & turning block arrangement have enough mechanical advantage? Also, did you mark a spot on the line so you know how tight to make it?
It strikes me that this type of line would allow for looser rigging for mast-raising, and then tighten up for performance.
Bruce
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Post by Richard Isaac Ceballos on Jan 10, 2022 18:05:22 GMT
Bwoods, Your questions prompted me to create a new post, see (Back Stay Adjusterd) for answers.
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Post by corsairf28r on Apr 22, 2024 10:38:38 GMT
Adjusting mast rake is good, but bringing the clew of the jib closer to the centerline would improve the pointing. The downside is that as you point up your speed will decrease so you will have to figure out whether it would be better to go faster and tack or point up go slower and go a shorter distance to get to a certain point.It is the same when going downwind. If you sail straight downwind (you can go only as fast as the wind is blowing) you will be going slower than jibing working the angles (speed increases as you sail off the wind).
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