Why can't skiffs 2 sail reach ?
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=2320
Printed Date: 17 Aug 25 at 11:38am Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Why can't skiffs 2 sail reach ?
Posted By: micmac37
Subject: Why can't skiffs 2 sail reach ?
Date Posted: 16 Oct 06 at 5:18pm
I sail an RS800 in a club handicap fleet if not doing an event. Events are great as they are windward leeward but club racing includes reaches which are a nightmare.
We all know skiff bearing off and getting downwind before a hoist requires sailing through "no mans land" where the boat is dificuilt to sail and unbalanced. This is the same for all other skiffs from what I have read.
Racing is designed around windward leeward courses so it is not a big issue but wind shifts occur etc. and it is a necessary skill.
My question is why are they not good at it ?
Taking 2 slower boats for comparison - a 505 sails beautifully on all points of sailing but the "skiff style" laser4000 does not, and suffers from the same problem as described above when sailing a 2 sail reach in comparison. Both boats are a similar speed/performance.
My 2nd question is how can you do it better ? I struggle against 505s in the RS800 when 2 sail reaching and have lost control and gone swimming a few times. I suspect practice is the key but are there pointers as regards boat flat, kicker setting etc.
Cheers
Mike
------------- Sail well
Feel Swell
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Replies:
Posted By: tgruitt
Date Posted: 16 Oct 06 at 5:46pm
never had a problem really, Cherub gets a bit nosedivey on a 2 sailer in waves, just gotta keep the rig powered up and you should be fine.
------------- Needs to sail more...
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Posted By: m_liddell
Date Posted: 16 Oct 06 at 5:53pm
My 14 isn't too bad on 2 sail reaches (try to avoid it) as long as you totally commit and go for it. The first time I made the mistake of 'going easy' and single wiring... boat nosedived even in quite flat water 
I remember sailing an RS800 on a really long 2 sail reach back to the beach. It was like balancing on a knife edge!
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Posted By: tgruitt
Date Posted: 16 Oct 06 at 5:54pm
Originally posted by m_liddell
I remember sailing an RS800 on a really long 2 sail reach back to the beach. It was like balancing on a knife edge!
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Shouldnt be too hard, they are plenty long and wide enough!
------------- Needs to sail more...
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Posted By: Iain C
Date Posted: 16 Oct 06 at 5:56pm
Mine (Cherub) is horrible, on account of being too short (bloody thing is not even 12', it's 11'9" for some reason!!) and having a huge roach on the main.
Makes it very easy to pitchpole as the CoE is very high and trying to drive forwards and down, and once the nose goes in it's goodnight vienna. Also, don't forget that a symmetrical boat will raise the centreboard loads. My Fireball is totally horrible if you try and reach in big breeze with the board down, it feels sticky, everything loads up and it just trips over the board. By raising it you move the CLR right back which is what you need for a reach.
When you extend the pole on an assym you are in effect moving the CoE right forward in relation to the CLR so you don't need to actually lift the board up and back as you do in a conventional dinghy.
The 800 will be loads easier to get through the bear away than a Cherub...I'm no expert at sailing an 800, but for the bear away in my boat it's a case of BACK BACK BACK, kicker right off, jib eased a bit, and LOADS of windward feel with very little rudder input. If she still feels like she's going down when you are completing the manoevre and the speed is coming on, just letting 18" of mainsheet run through my hand usually saves a swim.
------------- RS700 GBR922 "Wirespeed"
Fireball GBR14474 "Eleven Parsecs"
Enterprise GBR21970
Bavaria 32 GBR4755L "Adastra"
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Posted By: SetSail
Date Posted: 16 Oct 06 at 6:18pm
Sailing an 800 through this point isn't too bad for me, even in waves (south
coast) not sure if its down to luck or judgement as well as kicker off etc.
i've always thought this is the time, depending on the wind, to get your
weight forward as the boat slows.
my experience of sailing in a handicap fleets, is when its time to put the kite
up the legs are about the length of my tiller and is hardly worth it as all the
faffing increases the chances of driving into other boats.
------------- RS821 - Now for sale, PM for details
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Posted By: JimC
Date Posted: 16 Oct 06 at 7:56pm
Two sail reaches were always a great separator in my days in Cherubs: there were those who revelled in them and those who would be attempting to impale flatfish on the bottom with their bowsprit...
One of the reasons its one of the most difficult legs in skiff types is that you are probably travelling about wind speed, so it maximises the effect of gusts, lulls and changes in wind direction.
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Posted By: Jack Sparrow
Date Posted: 16 Oct 06 at 8:49pm
Originally posted by JimC
Two sail reaches were always a great separator in my days
in Cherubs: there were those who revelled in them and those who would
be attempting to impale flatfish on the bottom with their bowsprit...
One of the reasons its one of the most difficult legs in skiff types is that
you are probably travelling about wind speed, so it maximises the effect
of gusts, lulls and changes in wind direction.
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Brings us back to the: does the spinnaker lift the bows discussion.
Skiff style boats tend to have fine entry shape will the corresponding
lower volume in bows. Combine this with what Jim has said about
travelling at around wind speed and the movement of the C of E and with
twin string boats - mast foot pressure and 'Bob's A Cock', skiff shaped
hulls can be fun on a two sail'er.
I used to love em' in Loco and LFC ( wife didn't like em' in The Trifle :-) ).
As it was real seat of the pants stuff requiring full crew concentration and
a strong likelihood of meeting Mr Fore-stay.
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Posted By: 29er397
Date Posted: 16 Oct 06 at 9:03pm
in a blow the 29er was great fun on a reach, and pretty easy too, just keep the bow out of the water and its all good (very easy to keep the bow out on a 29er, you have to be pretty much on the front before itll go in!). When its windy the crew (or helm) has to be very quick on the main to react to the gusts and lulls, it can also be helpfull if the helm steers for the wind (the ovious bear away in the gusts head up in the lulls applies)
In the more marginal stuff is where it tended to become easy to slow down, sometimes the crew will oversheet in an effort to stay on the wire which is very slow to say the least!
Obviously practise makes perfect so get out there and practice! Every boat will behave differently on a 2 sail reach, the key is to get to know your own boat.
------------- http://www.kielderwatersc.org - Kielder Water Sailing Club
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Posted By: Rob.e
Date Posted: 16 Oct 06 at 9:15pm
All of which begs the question, "are windward /leeward courses a good test of sailing ability?". Surely the old olympic courses where designed to test your all round sailing ability, and windward leeward courses are more about doing whats fun. In ordinary club sailing you often find "old fashioned" boats doing quite well, cos you have to follow the shape of the creek or whatever, and you end up sailing in all sorts of directions!
Just a thought....
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Posted By: micmac37
Date Posted: 16 Oct 06 at 10:11pm
[it can also be helpfull if the helm steers for the wind (the ovious bear away in the gusts head up in the lulls applies)
I'm not sure if it as obvious as this and that this is where some of the dificuilty lies. When downwind enough this holds true. When going upwing the opposite holds true. When you are on a 2 sail reach in between it can surely be appropriate to head up or down in the gust at different times and this is part of the dificuilty when sailing in "no mans land" on a knife edge ?
Cheers
Mike
------------- Sail well
Feel Swell
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Posted By: 49erGBR735HSC
Date Posted: 16 Oct 06 at 10:52pm
The main cause of the pitch pole in "no man's land" is the fact that the rig is accelerating faster than the hull can keep up with. Remember the hull is moving against more resistance than the rig and when the rig loads up and accelerates as you bear away, if you allow it to power up too quickly, the bow will dig down, hence the reason for stabbing the boat downwind instead of the gradual bear away. More bouyant and heavier boats simply don't have this problem. When we two-sail reach our boat, we always make sure that we are aware of controlling acceleration and if the bow does start digging in, we head up and feather the sails slightly, if needed, to kill the acceleration slightly to slow the rig down. Initially we'll bear away by stabbing the boat downwind then head up onto a reach, just because you have more control of speed heading up from downwind, than you do from bearing away from close hauled. We've sailed Olympic courses on both Laser 5000s and 49ers, and the key aspect is to watch the rate of acceleration of the boat and obviously to have your weight right back if the wind is up. We'll always 2 sail reach instead of trying to kite it if the reach is tight because the boat goes much faster with the two sails being sailed flat than trying to sail the boat on its ear with the kite flogging struggling to make a mark.
------------- Dennis Watson 49er GBR735 http://www.helensburghsailingclub.co.uk/ -
Helensburgh S.C
http://www.noblemarine.co.uk/home.php3?affid=560 - Boat Insurance from Noble Marine
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Posted By: Isis
Date Posted: 16 Oct 06 at 11:24pm
My experiance from 2 sailing cherubs is that the main cause of stacking it is due to loosing grip on the boat and initiating a pitchpole by shifting crew weight rapidly in the 'forestay' direction. Getting well well back and locking into a fruitloop or two seems to be the key factor and the rest is down to stearing to the gusts to keep the boat as flat as possible and easing power when you have too to stop the rig loading up. They are definantly the most scary and twitchy point of sail but the grin factor is incredible if you can hold on to it...
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Posted By: swiftsolo.org
Date Posted: 17 Oct 06 at 12:03am
I guess it depends on your definition of reaching. If you are low enough that you can steer out of trouble by going low in a puff I don't think it is too bad. If it is blowing and you are trying to reach in the twilight zone then you are headed for trouble.
Once the wind is over 17 knots or so I prefer to head high on a tight reach and then drop through the twilight zone and probably hoist the kite. The alternative is usually quite wet!
Steve
------------- Building a Swift Solo
http://www.aussieswift.livesaildie.com - First Australian Swift Solo
Sailing F28 Tri - family cruiser
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Posted By: ssailor
Date Posted: 17 Oct 06 at 7:23pm
Another problem with skiffs and two sail reaching, is purely the amount of power your controlling in the main, once offwind steering controls the heeling, and upwind your already close enough to only need to slightly release the main to dump power, however on a 2 sail reach u need to release alot more!! 
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Posted By: Blobby
Date Posted: 18 Oct 06 at 6:35am
Courtesy of the Antipodean 12ft brigade who know how to sail skiffs...and who may accept that applying the same techniques to an RS800 may be successful...
Skiff Rule 6 The headsail will put you "in the piss" more than any other sail. Unless your trim is perfect you cannot bear away without stalling, or round up at will, without the headsail eased. When the breeze is fresh and you are two sail reaching, sail with the jib eased to just luffing so that you can go up or down a bit without touching it, or you will assume the position "on the fin again" (not arthur finnigan)
------------- One step forwards, 2 steps back...
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Posted By: m_liddell
Date Posted: 18 Oct 06 at 12:00pm
Originally posted by Blobby
Courtesy of the Antipodean 12ft brigade who know how to sail skiffs...and who may accept that applying the same techniques to an RS800 may be successful...
Skiff Rule 6 The headsail will put you "in the piss" more than any other sail. Unless your trim is perfect you cannot bear away without stalling, or round up at will, without the headsail eased. When the breeze is fresh and you are two sail reaching, sail with the jib eased to just luffing so that you can go up or down a bit without touching it, or you will assume the position "on the fin again" (not arthur finnigan)
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Very interesting. This is also mentioned in 'High Performance Sailing' as a way to depower, calling it 'low drag mode'. Easing the jib so that it it is backwinding but NOT flogging means there is minimal drag and the jib so not generating much power. The jib trimmed properly generates significant power due to it not being behind a mast, so this works quite well.
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Posted By: Blobby
Date Posted: 18 Oct 06 at 12:18pm
Since we are talking High Performance Sailing here there is a nice chart which shows the "up and ease", "aim and ease", "down and ease" transitions for balancing the boat. The actual angles will be boat and rig specific but the principles hold - and in the "aim and ease" sector you need much bigger eases since there is no change in direction to help you (also because in a gust the apparent wind moves aft too due to the change in windspeed so that makes the situation even worse).
------------- One step forwards, 2 steps back...
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Posted By: damp_freddie
Date Posted: 18 Oct 06 at 8:27pm
to add to dennis#s exc. post
the rig develops so much power without being able to bear away as you would on a win/lee course. So the pressure is maintained and much more heeling moment (sideways power component) is generated, more than the boats righting lever, mostly trapeze, can handle.
Also the wind "hits" you harder- it cannot spill around you as on a DDW kite blast on an HPS boat.
Your own apparent wind exacerbates the issue as the load comes on and off more erratically as the hull and rig accelerate taking -the sea state and the gusty nature of the puffy stuff into account !
In my old tasar we could blow off a host of assyms on 2 sail reaches becuase it#s low aspect sail plan allowed easy control of the power. bye bye RS 400 or ISO
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Posted By: JimC
Date Posted: 19 Oct 06 at 11:07am
Originally posted by damp_freddie
In my old tasar we could blow off a host of assyms on 2 sail reaches becuase it's low aspect sail plan allowed easy control of the power. bye bye RS 400 or ISO |
I'd expect the Tsar to be able to blow off either of those on a two sail reach, but not because of the low aspect ratio sail plan but because of the superior hull shape for fast reaching...
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Posted By: m_liddell
Date Posted: 19 Oct 06 at 6:09pm
The crew doing the main must help a huge amount on 2 sail reaches since they can use two hands to play the mainsheet.
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Posted By: 49erGBR735HSC
Date Posted: 19 Oct 06 at 9:20pm
Most of the time that theory works, although we've seen a few boats go down the mine just due to the fact that the crew or helm forgets to play the jib in the gusts.
------------- Dennis Watson 49er GBR735 http://www.helensburghsailingclub.co.uk/ -
Helensburgh S.C
http://www.noblemarine.co.uk/home.php3?affid=560 - Boat Insurance from Noble Marine
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