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timeintheboat View Drop Down
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Posts: 615 		Post Options Post Options   Quote timeintheboat Quote  Post ReplyReply Direct Link To This Post Topic: Rs 800
    Posted: 13 Feb 08 at 8:40pm
Blimey foaminatthedeck that is a new Lark you have! 
Like some other things - sailing is more enjoyable when you do it with someone else
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foaminatthedeck View Drop Down
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Posts: 318 		Post Options Post Options   Quote foaminatthedeck Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 08 at 8:57pm
Slightly less new now, typo sorry 
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Chas 505 View Drop Down
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Posts: 119 		Post Options Post Options   Quote Chas 505 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 08 at 8:58pm

Agree with GRF - I thought that Daggerboards would be hard to achieve, but Dan J was really keen on it, when  spoke to him at the BM.

Merlin boy, we used to think that gybing blades were a step too far also - however, we switched last year, and it has changed our minds.

Apart from the obvious height advantage when you need it, the major thing we have found is that the extra twist allows us the ability to sail the boat a bit freer for the same height - aka more pressure in the rig.

Now this is really cool if the wind is 12 knots or less, as the lulls are normally when the rig slackens off....we just put the nose down and keep going = more speed = better lift; better acceleration when the wind comes back etc,etc.

We are fans..!!

 
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Work Hard; Play Hard; Sail a 505
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Medway Maniac View Drop Down
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Posts: 2788 		Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 08 at 10:41pm

Bethwaite points out that a gybing board means that the hull runs straight, putting the rudder into the wake of the board, increasing its skin friction drag.

Add that to the handling complications and the fact that you need to lose most of the added incidence off the wind, and it makes the gybing board questionable to say the least.
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redback View Drop Down
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Posts: 1502 		Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 08 at 11:55pm

Gybing Boards  - Five Os tried them years ago and found them particularly poor in waves as they tended to switch back and forth as the pressure came on and off.  The theory is good but I'm not sure you see much real world difference probably because you lose a little bit of rigidity.

A good discussion about the 800, it is a good boat.  This sl*gging off other peoples classes is a pain, all classes have good points (and bad) and its good to compare them.  The 800s only weak point is that such competence can seem a little boring whereas an Internationa 14 is full of faults, but what a ride!

When I say boring I am talking relatively.
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Chew my RS View Drop Down
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Posts: 790 		Post Options Post Options   Quote Chew my RS Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 08 at 7:10am

Thre's a really excellent explanation of gybong board physics at the link below, by American aerodynmics expert Tom Speer.

http://www.boatdesign.net/forums/showthread.php?t=5783&h ighlight=gybing+board
http://www.sailns14.org - The ultimate family raceboat now available in the UK
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Merlinboy View Drop Down
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Posts: 3169 		Post Options Post Options   Quote Merlinboy Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 08 at 8:44am
Originally posted by redback

Gybing Boards  - Five Os tried them years ago and found them particularly poor in waves as they tended to switch back and forth as the pressure came on and off.  The theory is good but I'm not sure you see much real world difference probably because you lose a little bit of rigidity.

A good discussion about the 800, it is a good boat.  This sl*gging off other peoples classes is a pain, all classes have good points (and bad) and its good to compare them.  The 800s only weak point is that such competence can seem a little boring whereas an Internationa 14 is full of faults, but what a ride!

When I say boring I am talking relatively.

 

Just out of interest what faults?



Edited by Merlinboy
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Chew my RS View Drop Down
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Posts: 790 		Post Options Post Options   Quote Chew my RS Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 08 at 9:00am
Without wanting to second guess Redbacks mind, the beam measurement point is further forward than ideal, leading to hulls that are fairly blunt bowed/stocky.  Some would also argue they are too short for the amount of sail they carry (hence the development of the T-foil).  Still a great class though.
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Black no sugar View Drop Down
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Posts: 3941 		Post Options Post Options   Quote Black no sugar Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 08 at 9:26am

Originally posted by redback

 ... whereas an International 14 is full of faults, but what a ride!

 

It sounds as though Redback's been for ever traumatised by Alex's boat handling...

 

 
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Ross View Drop Down
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Posts: 1163 		Post Options Post Options   Quote Ross Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 08 at 9:41am
Originally posted by Chew my RS

Some would also argue they are too short for the amount of sail they carry (hence the development of the T-foil)




AFAIK t-foils are purely to push the arse out the water. This has a "pushing the nose down" effect that is compensated by your boat trim (move further back to compensate and "load up" the foil. This effectively reduces the weight of the boat while sailing and promotes planing earlier. Down wind it has the added bonus of stabilizing the boat when it's honking.

I don't know why it's length or the amount of rag would  prompt the development of the t-foil.
Ross
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