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- Newsgroups: rec.boats
- Path: sparky!uunet!munnari.oz.au!titan!headplant!harsant
- From: harsant@headplant.trl.OZ.AU (Dave Harsant)
- Subject: Re: Tuff Luff and other headstay foils
- Message-ID: <1992Nov20.010313.25512@trl.oz.au>
- Sender: root@trl.oz.au (System PRIVILEGED Account)
- Organization: Telecom Research Labs, Melbourne Australia
- References: <1992Nov17.000333.5080@klaava.Helsinki.FI> <guido.722012392@sparc-3> <1992Nov17.215451.3441@klaava.Helsinki.FI>
- Date: Fri, 20 Nov 1992 01:03:13 GMT
- Lines: 48
-
- In article <1992Nov17.215451.3441@klaava.Helsinki.FI> tarkkone@klaava.Helsinki.FI (Lauri Tarkkonen) writes:
- >As I said, if you compare badly executed hank sail change to a well executed
- >foil change there is a real difference. Because people interested in winning
- >races invest more in practice as well as equipment Mr. Scot might be under
- >the false impression that there is a really big difference between the
- >two procedures, when the real difference was between the crews. :-).
- >Maybe I am not that stupid after all. ;-).
-
- I don't know why you guys are still arguing over this. A well executed
- headsail change with a headfoil will always win over a hanked change
- executed with the same degree of skill. If you disagree, go reconsider.
- The evidence has been presented.
-
- As to what small boats do when racing, well, I race on a Seaway 25
- (similar to J24, a little heavier and slower), and we have a twin track
- foil. Most of our racing is in the 2-5 hour range. We hardly ever
- change sail on a beat, because we can carry our number 1 up to about 20
- kn. Over 20kn, we use a number 3. On rare occasions, the wind is
- varying around the 18-22 kn range, and we could do with a number 2, but
- we don't have one. In these conditions we make a judgement on what the
- wind will do, and choose the 1 or 3. If we have the 1 up, and the wind
- gets too strong, we can normally depower enough to save changing sail
- till the downwind leg. However, if the wind drops to under 18 with the
- number 3 up, we usualy must change immediately, unless very close to
- the buoy, because we become very under powered, and drop out the back
- door. This is where we need the foil. Nearly all the boats in our
- Club fleet (ranging from 22ft to 60ft) use foils. All the serious
- Seaway racers use foils. The J24s (there are about 20 of them at Royal
- Brighton) do not seem to. Prevailing local conditions on Port Phillip
- bay are usually such that a SW sea breeze will come in for the Saturday
- afternoon races, so the wind will usually be strengthening after 3pm in
- summer, from 10-15 building to 20kn. We didn't make an upwind change
- at all last season, but made a couple on shy reaches without the
- spinnaker up, where we wanted the extra power, and some when the kite
- was up. Actually, the one occasion where we would have changed down to
- the No. 3 was when we misjudged the wind strength on the run, and found
- it was about 20-25 on rounding the mark. We were coming second, and
- would have lost ground if we had stayed with the No 1 the whole leg,
- but the mast broke before we could do anything. Turned out one of the
- spreaders had fatigued in the socket where it attaches to the mast.
-
- So most of the time we don't need the foil, but on those occasions when
- we do, it saves us significant time. Seconds translate into boatlengths.
- We have never had a problem with the foil in 7 years.
-
- --
- Dave Harsant,
- Telecom Australia Research Laboratories | d.harsant@trl.oz.au
-