Some questions-Any answers?

   regarding gybing angles; these will be fairly deep given the sppeds these are hitting in 10kts of wind (I've heard of 30kts in 8kts true!!!) 
Re tacking upwid; again I think they will be similar to "normal" beach cats; a more stategic view of sailing up wind (hence all the stuff in remote wind sensing) whereby you decide where on the course you want to be for expected shifts and wind bends instead of the more simplictic "tack on the shift when it arrives" of "quick totack boats".
IF speeds are similar, and wind is stable,  there might be some cover tacking but the stregic view of the 20 mile leg will probs override most of the time.
Mark rounding will be the same as other boats; bear-off carefully and smoothly and get the reacher up pronto! 

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Scooby_simon Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 02 Apr 04 Location: United Kingdom Online Status: Offline Posts: 2415	Post Options Post Reply Quote Scooby_simon Report Post Quote Reply Topic: Some questions-Any answers? Posted: 11 Feb 10 at 1:37pm
	regarding gybing angles; these will be fairly deep given the sppeds these are hitting in 10kts of wind (I've heard of 30kts in 8kts true!!!) Re tacking upwid; again I think they will be similar to "normal" beach cats; a more stategic view of sailing up wind (hence all the stuff in remote wind sensing) whereby you decide where on the course you want to be for expected shifts and wind bends instead of the more simplictic "tack on the shift when it arrives" of "quick totack boats". IF speeds are similar, and wind is stable, there might be some cover tacking but the stregic view of the 20 mile leg will probs override most of the time. Mark rounding will be the same as other boats; bear-off carefully and smoothly and get the reacher up pronto!
	Wanna learn to Ski - PM me..

JMC_DK Send Private Message Find Member's Posts Newbie Joined: 10 Feb 10 Location: Denmark Online Status: Offline Posts: 8	Post Options Post Reply Quote JMC_DK Report Post Quote Reply Posted: 12 Feb 10 at 11:20am
	My bet is that they will stay out of each others way and start on the same tack pretty near the middle of the line and the primary objectives will be speed + not going over the line early.. That is the closest they will be for the entire two races

tgruitt Send Private Message Find Member's Posts Really should get out more Joined: 02 Dec 04 Online Status: Offline Posts: 2479	Post Options Post Reply Quote tgruitt Report Post Quote Reply Posted: 12 Feb 10 at 11:29am
	Can anyone explain what a dialup is please? I'm guessing we're not talking about the type of slow internet?
	Needs to sail more...

Isis Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 01 Sep 05 Online Status: Offline Posts: 2753	Post Options Post Reply Quote Isis Report Post Quote Reply Posted: 12 Feb 10 at 6:42pm
	The Dialup occurs when both boats aproach on oposite tacks (as they do entering the box prestart) and turn upwind as they reach each other - Dialling down would involve turning downwind.

Steve411 Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 09 Sep 08 Location: Cheddar, Somerset, England Online Status: Offline Posts: 705	Post Options Post Reply Quote Steve411 Report Post Quote Reply Posted: 13 Feb 10 at 9:31am
	Different subject - why is a solid sail so apparently more efficient than a conventional soft sail? (I'm thinking I should have paid more attention in physics lessons at school).
	Steve B RS300 411 RS300 page

PeterG Send Private Message Find Member's Posts Really should get out more Joined: 12 Jan 08 Location: United Kingdom Online Status: Offline Posts: 822	Post Options Post Reply Quote PeterG Report Post Quote Reply Posted: 13 Feb 10 at 10:00am
	In large part it must be about control (though there must also be advantages in having an airofoil whose curves don't keep changing as the wind does). Oracle has a series of flaps and a large number of sensors which presumably mean that they can precisely control the shape of different bits of the "sail" in ways that mortals with a kicker, outhaul and cunningham can merely dream about. Watching the start of the downwind leg yesterday what was striking was how much more consistent Oracle's course and heel were than Alignhi's. Partly that may be due to Oracle being that much more powered up, but I don't mind betting that part of it was due to the fine control they could exercise on the wing as the wind strength fluctuated.
	Peter Ex Cont 707 Ex Laser 189635 DY 59

lurker Send Private Message Find Member's Posts Newbie Joined: 21 Oct 09 Online Status: Offline Posts: 6	Post Options Post Reply Quote lurker Report Post Quote Reply Posted: 13 Feb 10 at 1:27pm
	A number of things change at once in the change so hard to pin the benefits of- control of twist in seven stages double surface aerofoil (likely to improve range of efficient wind angles) smooth & solid aerofoil (likely to be important in pointing high) the 'slot'(likely to be especially important downwind) at times the difference appeared big, hardly ever looked like the Cat had a gust to itself. My uneducated guess is that the slot is the crucial factor in the mix. (The idea is to prevent the airflow detaching). I wonder if a 'two part' sail could be fabricated to do similarly, maybe with straps holding the two parts.