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dllee
Joined: 03 Jul 2009 Posts: 5329 Location: East Bay
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Posted: Sat Oct 08, 2016 8:09 pm Post subject: |
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Depend on preferences and body build.
At 5'10" and 150 lbs., I go 7" higher than slalom.
Some really tall guys use about the same boom heights for Formula, but higher than my 54" for their slalom sailing. |
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DanWeiss
Joined: 24 Jun 2008 Posts: 2296 Location: Connecticut, USA
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Posted: Sun Oct 09, 2016 12:32 am Post subject: |
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atlas.wave55 wrote: | I am unsure of what height to set the boom for a formula board with big sail.I know a guideline is somewhere in between shoulder and chin height but should I set it a bit higher like forehead.Would it help to plane earlier with a higher boom set up? |
Since you will stand farther from the mast foot on a wide FW board than on nearly anything else, your boom height must move up, likely higher than anything else you've sailed. At 5'6" my booms are over my head when standing the rig upright on the board. The booms will come down to you as the sail sweeps back and rakes to windward.
If your booms are too low you surrender the power you need from the rig to really get going in light winds.
High booms are why FW racers must use especially long harness lines apart from the obvious need for adjustability. _________________ Support Your Sport. Join US Windsurfing!
www.USWindsurfing.org |
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techno900
Joined: 28 Mar 2001 Posts: 4161
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Posted: Mon Oct 10, 2016 8:44 am Post subject: |
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I know I have my boom too low, but when I do free sail formula, I am in gusty winds (0-20) at times and I like to stay hooked in while slogging. So, My boom is usually no higher than shoulder. Also, I think it is easier and more efficient to pump with a lower boom, and that's the only way to get planing in light winds. |
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bred2shred
Joined: 02 May 2000 Posts: 989 Location: Jersey Shore
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Posted: Mon Oct 10, 2016 11:14 am Post subject: |
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Start with the boom around chin to mouth height when standing static on the board. If you set it at the same height you would use on a "normal" board, it will be too low when you're powered up in the straps on a Formula board.
sm |
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DanWeiss
Joined: 24 Jun 2008 Posts: 2296 Location: Connecticut, USA
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Posted: Mon Oct 10, 2016 1:17 pm Post subject: |
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The most powerful pumping action itself occurs with the booms at shoulder level. However, a higher boom increases your leverage over the rig as you must pump the entire sail, most of it very high above.
Another thing about high booms is using long lines, ideally adjustable. Long lines will allow you plane very early without pumping on wide FW-style boards because you will not oversheet when moving back to final sailing location. Short lines will cause oversheeting and stall the sail. _________________ Support Your Sport. Join US Windsurfing!
www.USWindsurfing.org |
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atlas.wave55
Joined: 24 Aug 2016 Posts: 111
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Posted: Fri Jun 23, 2017 6:14 pm Post subject: |
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277 days later from my first post on this topic...
This Wednesday I bought a Formula 136 2002. It is in good condition, no repairs and came with a 47 cm weed fin and board bag. I will be taking it out for my first run on it this weekend
Thanks for all the discussion and good information on this topic! |
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jingebritsen
Joined: 21 Aug 2002 Posts: 3371
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atlas.wave55
Joined: 24 Aug 2016 Posts: 111
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Posted: Sun Jun 25, 2017 3:36 pm Post subject: |
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The fin I used was a true ames 47cm weed fin yesterday and it did not go upwind very well.
If I get a pointer fin what size should I get to cover most winds in my area ranging from 12km to 30km? My body weight is 140lbs and their is a 70cm tail width on my formula board. I am using a 7.5m sail with it, but may get something like an 8.5 or 9m for light winds. |
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joethewindsufa
Joined: 10 Oct 2010 Posts: 1190 Location: Montréal
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Posted: Sun Jun 25, 2017 5:48 pm Post subject: |
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I was going to guess 60 cm for an 8.5 since I use 56 cm slalom fin on JP SLW92 for that sail size
James' calculator suggests 64 cm
since you are lighter, perhaps 60 cm is enuff ?? |
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dllee
Joined: 03 Jul 2009 Posts: 5329 Location: East Bay
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Posted: Mon Jun 26, 2017 11:14 am Post subject: |
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Small changes in fin sizing affect the handling of the board greatly.
We use 62 cm fins (F-4 soft) when going Formula and 6.7 or 7.5, which is the max sizing we own or carry. About 160 lbs rider's.
Smaller just allows the board to spin out in low winds, while bigger starts railing up when powered up, especially if the fin is stiffer, like an R-13 M at 62 cms. |
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