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Forums28
Topics3,984
Posts19,069
Members1,019
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Most Online238 Feb 9th, 2024
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Re: Mast Step Postion measuring
[Re: Cap'n Vic]
#12825
01/08/12 11:18 PM
01/08/12 11:18 PM
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Joined: May 2007
Posts: 2,669 Portsmouth, RI
Rhapsody #348
Past J/30 Class President
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Past J/30 Class President
Joined: May 2007
Posts: 2,669
Portsmouth, RI
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Vic. That is legal per class rules: 5.7.3 Position of the mast shall be fixed at the deck 3505 mm plus or minus 13 mm from stemhead tip to the front edge of the mast. And it shall be permanently fixed to an immovable mast step so that the forward edge of the mast is not less than 25 mm aft of the forward vertical face of the molded step in the sole liner.You are more than 25 mm aft. Effectively this moves the top of the mast forward. Not optimal tune. Read comments in this thread
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Re: Mast Step Postion measuring
[Re: Russ Atkinson]
#12836
01/09/12 03:38 PM
01/09/12 03:38 PM
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Joined: May 2007
Posts: 1,234 Newport and Naples
Cap'n Vic
Senior Member
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Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
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Aaah the dreaded weather helm .... If you haven't viewed Kid Peel zip to the start of the close haul segment where 11 year old William is operating at nearly no weather helm running around 5.7 +kts. It would be really interesting to see ,using a fish scale say for example, just how many pounds is required to point optimally under good wind conditions runing around 5.5kts. I add this into the discussion as there have been comments that the J30 is not a kid boat and is tiring to sail close haul for most gals. Are we are talking about a very narrow tuning/wind-speed range? that may be related to mast step offset? {also consider that 505 has a modified rudder to somewhat offset weather helm} later this week Brian J30 #22 and I will be shortening the forestay perhaps as much as 1.5 in. to get some of the wobble out of the forestay. Notice I am not saying sag, but wobble. we will do the whole thing with back stay and shrouds off. I'm thinking tuning the lowers first to establish a "fixed" point in regard to the forestay ... In othe rwords basically tuning to a forestay length geared to eliminating wobble but a reasonably straight mast.
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Re: Mast Step Postion measuring
[Re: Russ Atkinson]
#12838
01/09/12 04:20 PM
01/09/12 04:20 PM
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Joined: Apr 2007
Posts: 97 Bainbridge Island, WA
JBro
Senior Member
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Senior Member
Joined: Apr 2007
Posts: 97
Bainbridge Island, WA
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Folks - this is a great discussion. Between the rules and the functional review of how the step, partners, etc. changes affect the way the rig sets up, it's a great overview of how to optimize the boat's performance.
Back when Bill and Dave asked for feedback, one of the things I suggested were more "How-To" articles. Often, great ideas and knowledge are buried in not just one thread but even cross-linked between multiple threads. For a newb visiting the site trying to figure things out, find good guidance, etc. it's not terribly easy to find what's needed to get the boat and rig in tune (and in optimized class conformance). Same for other topics.
It would be great to see folks, as they do these projects, take the content in the threads, their own pics, measurements, and whatnot, and create one document that highlights the process. That would help bring the entire class up to speed, demystify some of the more obscure projects, and help establish authority of a great community and class across all sailing communities.
Some sample topics that jump to mind include: - Updating the mainsheet to gross/fine trim - Updating the backstay adjustment controls - Installing a boomvang/kicker - Installing new halyard stoppers - Replacing the standard hatches - Rebuilding the original Barient winches - Replacing the fixed portlights
There are some great sites (like Bill's!) that feature some of this content but it would be great to either host some of it on the J30.org site or at least develop more organized links to it.
Creating a new forum post is likely not the best mechanism. What's the best way to create a document like this - with pics - that can then be added to the repository of How-To documents on the site?
Thanks! - Jeff
- Jeff J/30 #426 - Watusi
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Re: Mast Step Postion measuring
[Re: Russ Atkinson]
#12840
01/09/12 05:31 PM
01/09/12 05:31 PM
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Joined: Jan 2010
Posts: 186 Barrington, RI
cstoddard
Senior Member
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Senior Member
Joined: Jan 2010
Posts: 186
Barrington, RI
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In order to get the best up wind performance you want to have the max straight rake in the rig this is achived by have the mast step at min setting (ie as far forward as possible) and the mast as far aft at the deck (mine is set with spar tite) and yes it has to be fixed for the N/A's.
Then you can set the forestay for max lenght. Back stay should be totally loose. With those settings you can follow the tuning guide from your sail maker. I have settings for light (< 10 knots true) medium (8-14) and heavy 14 and up
I only adjust the shrouds not the head stay
That said when we are hard on the wind going up hill the helm is totally balanced (two finger driving) up thru about 13-14 knots
After that the amount of mainsheet trim and travel becomes key to keeping the boat flat and balanced I have never had to two hand the boat when hard on the wind Reaching is a different matter that can be real work
Hope this helps
Charlie Stoddard Falcon #229
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