myiW Current Conditions and Forecasts Community Forums Buy and Sell Services
 
Hi guest · myAccount · Log in
 SearchSearch   ProfileProfile   Log in to check your private messagesLog in to check your private messages   RegisterRegister 
One board quiver-formula
Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8, 9  Next
 
Post new topic   Reply to topic    iWindsurf Community Forum Index -> Eastern and Central USA & Canada
View previous topic :: View next topic  
Author Message
dllee



Joined: 03 Jul 2009
Posts: 5328
Location: East Bay

PostPosted: Sat Oct 08, 2016 8:09 pm    Post subject: Reply with quote

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.
Back to top
View user's profile Send private message
DanWeiss



Joined: 24 Jun 2008
Posts: 2296
Location: Connecticut, USA

PostPosted: Sun Oct 09, 2016 12:32 am    Post subject: Reply with quote

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
Back to top
View user's profile Send private message
techno900



Joined: 28 Mar 2001
Posts: 4161

PostPosted: Mon Oct 10, 2016 8:44 am    Post subject: Reply with quote

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.
Back to top
View user's profile Send private message
bred2shred



Joined: 02 May 2000
Posts: 989
Location: Jersey Shore

PostPosted: Mon Oct 10, 2016 11:14 am    Post subject: Reply with quote

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
Back to top
View user's profile Send private message
DanWeiss



Joined: 24 Jun 2008
Posts: 2296
Location: Connecticut, USA

PostPosted: Mon Oct 10, 2016 1:17 pm    Post subject: Reply with quote

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
Back to top
View user's profile Send private message
atlas.wave55



Joined: 24 Aug 2016
Posts: 111

PostPosted: Fri Jun 23, 2017 6:14 pm    Post subject: Reply with quote

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 Very Happy

Thanks for all the discussion and good information on this topic!
Back to top
View user's profile Send private message
jingebritsen



Joined: 21 Aug 2002
Posts: 3371

PostPosted: Fri Jun 23, 2017 7:24 pm    Post subject: Reply with quote

if you do not need weed fins, do not use them.

formula is all about extreme angles of attack. upwind and down. weed fins suck at that.

_________________
www.aerotechsails.com
www.exocet-original.com
www.iwindsurf.com
http://www.epicgearusa.com/
Back to top
View user's profile Send private message
atlas.wave55



Joined: 24 Aug 2016
Posts: 111

PostPosted: Sun Jun 25, 2017 3:36 pm    Post subject: Reply with quote

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.
Back to top
View user's profile Send private message
joethewindsufa



Joined: 10 Oct 2010
Posts: 1190
Location: Montréal

PostPosted: Sun Jun 25, 2017 5:48 pm    Post subject: Reply with quote

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 ??
Back to top
View user's profile Send private message Visit poster's website
dllee



Joined: 03 Jul 2009
Posts: 5328
Location: East Bay

PostPosted: Mon Jun 26, 2017 11:14 am    Post subject: Reply with quote

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.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    iWindsurf Community Forum Index -> Eastern and Central USA & Canada All times are GMT - 5 Hours
Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8, 9  Next
Page 8 of 9

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum

myiW | Weather | Community | Membership | Support | Log in
like us on facebook
© Copyright 1999-2007 WeatherFlow, Inc Contact Us Ad Marketplace

Powered by phpBB © 2001, 2005 phpBB Group