|Topic Review (Newest First)|
|10-28-2014 01:43 AM|
Re: Loose Foot vs. Attached—What's Best?
I changed my Bene 411 to loose footed main and have noticed in heavy air running the boom does get a bit of a bend in it(may be I should reef earlier)On a nother yacht I had 40fter I did break the boom (twice) I don't no if the reason was the loose footed main or hitting the back of the swell, I think reefing a bit earlier to take the strain away from the end of the boom is the trick
|05-18-2011 12:33 PM|
You are probably right that you would not notice the difference between a shelf foot or a loose foot main vs. a traditional attached foot mainsail, if you are sailing a low performance boat like a Challenger 40 ketch, especially in a high wind venue like San Francisco.
But for the rest of us, the reality is that a shelf foot or loose foot, allows the lower portion of the sail to have a closer to proper shape all the way to the foot, whereas a traditional attached foot flattens the lower portion of the sail reducing the performance and increasing heel by over-flattening the largest portion of the sail. This ability to shape the lower portion of the sail offers a real advantage on higher performance boats.
Once you start trying to shape the lower portion of the sail, there are two contradictory arguments that get made; a shelf foot acts as an end plate increasing efficiency by preventing 'pressure leakage' and decreasing tip vortex but loose foot sails have more area and theoretically generate less turbulence at the boom.
In terms of your comment that the bolt rope at the foot of the sail distributes the load far more fairly than points at the tack and clew, with less reinforcing needed at these two connections, that is only true on a low performance sail which lacks a shelf foot. Once the sail has a shelf foot, there should be no load distributed to the bolt rope, and so the load distribution and corner reinforcing is virtually the same between a shelf foot and a loose foot.
|05-18-2011 01:00 AM|
I am plenty happy with my attatched foot main and mizzen. I feel that the bolt rope at the foot of the sail distributes load far more fairly than points at the tack and clew, with less reinforcing needed at these two connections. The complaint regarding outhaul adjustment does make sense, the extra friction due to the boltrope is certainly a hinderance to tightening, yet this is not a problem I can remember encountering. I feel that my attached foot sails have better shape insofar as their draft, they also make a great hammock when running from the wind!
|03-17-2011 08:48 PM|
We've had reef ties on several boats over the years. I have the grommets for them on my 35' sloop, but don't use them and don't even have them installed. Now that we've retrofitted single line reefing (led to the cockpit), we'd rather not go on deck for reef ties, anyway.
We had a catboat (with a boom longer than the LOD) for 15 years and would use the ties if we had more than one reef. The need here was to gather a lot of sailcloth: didn't want to catch anything in a gybe and also wanted to minimize visual blockage. The key here is to have long enough reef ties so they could be tied loosely, as the previous commenter indicated.
Going back to the sloop, we opted to eliminate the shelf last time we ordered a new main. We have lines in the leech and foot to minimize flutter.
|01-08-2011 11:57 AM|
|acunningham||Jack: Thank you!|
|01-08-2011 11:54 AM|
Faster is correct.
I tell my students that the ties are primarily cosmetic and help prevent the sail from blocking your view. Many charter companies do not put reef ties in the sails because of the damage that can be caused by trying to shake a reef with the ties in place.
Reef ties are tied loosely around the boom, whether or not the sail is loose footed.
One of disadvantages of the loose footed main is that the shelf of the sail on an attached main can be used to indicate too much outhaul tension. You get a crease if the outhaul is too hard.
|01-08-2011 11:38 AM|
[QUOTE=Faster;684278]I think he's referring to the clew reefing line(s), not the 'reef ties' that you're thinking of. Tightly tying in the reef ties around the boom can indeed cause damage to the sail, whether loose footed or otherwise.[/QUOTE]
Thanks, that makes sense. I've never sailed a boat with an attached foot mainsail, but I'd assumed that with such a sail one had no choice but to wrap the ties around the boom as there was no gap between the boom and the sail. Is that wrong, and there's enough of a gap to fit the ties?
|01-08-2011 11:04 AM|
[QUOTE=acunningham;684277]This sentence surprises me. I once had an instructor tell me never to tie reefing lines around the boom on a loose-footed mainsail, as it could cause excessive load on the sail cloth and tear it. He told me to simply tie them under the foot of the sail. Was he wrong?[/QUOTE]
I think he's referring to the clew reefing line(s), not the 'reef ties' that you're thinking of. Tightly tying in the reef ties around the boom can indeed cause damage to the sail, whether loose footed or otherwise.
|01-08-2011 10:58 AM|
[QUOTE=Dan Dickison;170332]Equally important is the fact that a loose-footed mainsail enables you to more easily rig reefing lines by tying the bitter end around the boom.[/QUOTE]
This sentence surprises me. I once had an instructor tell me never to tie reefing lines around the boom on a loose-footed mainsail, as it could cause excessive load on the sail cloth and tear it. He told me to simply tie them under the foot of the sail. Was he wrong?
|01-06-2008 10:29 AM|
|ericroline||The loose footed main is more adjustable and prefered on most racing applications. If it is cut with excessive foot material it will hang lower than the boom improving the performance , increasing the aspect ratio. Disavantages are that you may catch it on your head or it may flutter in a breeze. No major difference when reefing. The quotes that I received from North did not have a price difference. Check out what is hot in the one design groups if you plan to race.|
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