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Author Topic: Forstmann Boom  (Read 5584 times)
DN 5449
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« on: February 14, 2011, 01:52:17 PM »

What is the major advantage of a Forstmann boom?
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Geoff Sobering
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« Reply #1 on: February 14, 2011, 02:44:53 PM »

What is the major advantage of a Forstmann boom?

Well, there's a major reduction in weight from all the cash that you won't have in your wallet anymore...  Grin

Seriously, the advantages that I see are:
  • The blocks are recessed up in the boom to the maximum allowed so the boom-deck distance can be smaller.
  • The blocks are on a continuously adjustable track (although the "as delivered" adjustment system isn't very convenient).
  • The distance between the bolt-rope and the blocks is minimized by recessing the bolt-rope track down in the boom so it is right above the block-track. This minimizes the distance the boom moves off to the side when it loads up.

The last item may need some explanation. Imagine you had a 6" distance between the boom-blocks and the sail, and you had sheeted in so the deck and boom blocks were tight together. Without and side-load the boom would sit vertically 6" above the deck, but as the side-load increases, the boom would move out (and down) along an arc with a radius of 6" centered on the pivot where the deck-blocks attach to the hull.

This is also the reason you use a rigid riser-block to raise the sail up off the deck, rather than just easing the sheet.

Cheers,

Geoff S.
« Last Edit: February 14, 2011, 02:53:55 PM by Geoff Sobering » Logged

Man Why You Even Got to Do a Thing
DN 5449
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Posts: 368


« Reply #2 on: February 14, 2011, 05:24:41 PM »

 So would you classify it as  nice to have or a very important upgrade?
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