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TSAF 15th July 2011 06:16 PM

Formula boom geometry
 
Hi,
How do you think geometry of a boom affects your sailing.?
Do wider booms makes the sail more stable, because they are giving more distance from the sail?
Is this a drawback when it is lightwind?
Do superstiff booms like maui become a disadvantage because they don't absorbe anything.?
Also what do you think about front wide section of the boom(al360) instead of more traditional (neilpryde)..?

This article is interesting:
http://www.windsurfingtour.com/?p=2286

Ken 15th July 2011 09:47 PM

While I have an assortment of carbon formula booms (Maui Sails Formula, wide tail; Newer HPL with the larger diameter and wide tail, and older HPL with standard thickness and narrow tail), The greatest difference I experience is in the weight, and not so much in the stiffness or the advantage/disadvantage of the tail or body width.

Geometry is one issue, but I would like to get some feedback on stiffness as well.

Let me speculate and hopefully some better formula sailors & boom designers will contribute to the discussion.

A softer more flexible boom in a gust should shorten a bit, adding to the depth of the foil, thus increasing the power and reducing the range. I use the older HPL, which is softer than the other booms on my 11.0. This is probably a mistake since the range of the sail is pretty limited for me. 15 knots and I am getting pretty stressed, but I am also 77kg and not a great formula sailor. However, I like the lighter weight of the old HPL.

It's not likely, but would a softer boom on a deep downwind run be better in a gust, deepening the pocket and stabilizing the sail? Just a blind theory, but who knows? Upwind, it seems clear that increasing the foil depth in a gust is not a good thing, so a stiffer boom would be better.

As for boom width in the tail, a wider tail that keeps the sail from creasing over the boom when bagged seems like a good idea. In the front, I am not sure about that benefits, but I doubt that a wider boom has any impact on stability.

At what point (sail size) is the difference between the stiffness of an aluminum boom and a carbon boom become insignificant? I guess it depends on the sailor and conditions. A PWA slalom racer with a 7.6 in 30 knots could probably tell the difference. A advanced recreational sailor with a 7.6 in 20 knots probably can't. What do you think?

Winterly 19th July 2011 04:11 PM

Hello, everyone. It is my first time to come here. Thanks for your share. Hope to learn more knowledge from this forum.
Best wishes


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