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Re: Boom position on a close reach

 

We do not have a boom vang set up (yet) which is why we tend to reef in winds 18+ kts.? Our main is quite old but full battened and with a decently set reef we are much more comfortable.? You can keep the genny full or furl it in to match the reefed main, which I prefer.? We only have a turnbuckle on the aft stay as when we replaced our roller furling the Furlex unit was installed without any adjustment to the fore stay tension.? We probably have about a foot or so of sag at the leading edge of the jib when under load and will be replacing the aft turnbuckle so we can tighten it up a bit more.
In terms of mast rake (aft mast rake that is) I do not think that you want any for a T27.? I also own a 19' Lightning which is currently set up with a lot of aft mast rake (presumably for light air sailing).? The mast on the Lightning also has an aft stay tensioning system which will induce some bend and therefore twist into the sail for higher winds.? The mast on our T27 will not bend much, if at all.? Since the Lightning is a pure bred racing boat it has all kinds of sail trim adjustments that are not always available on the T27.? The Lightning can go a bit faster than the T27 if tuned correctly in the right wind.
I would guess that the weather helm force on our T27 is in the 30 - 50# range when at its worst.? When this is the case we always first play with the centerboard.? On downwind tacks when racing we usually bring the board up to reduce drag but if it is too far up the boat will tend to yaw and pitch more, causing the helmsman to have to over compensate.? In this case more (lower) board is called for.? On upwind legs we generally like the board at about a 45+ degree angle that helps move the center of effort astern which helps to reduce the weather helm.
Another control to consider with all of this is the jib fairleads.? In high winds the blocks should be moved as far aft as possible to help pull the entire sail flatter yet allow for the maximum 'slot' between the jib and main.? This allows for some twist in the upper part of the jib as well.? In lighter winds the blocks should be moved forward to help create more belly in the jib and tension on the leech.?
I am still learning about all this stuff so your mileage may vary.? There have also been many books written on sail trim but only you know how you sail your own boat.
All the best.
Caleb
#328, Odalisque, 1967



From: Armando Morell
To: T27Owners@...
Sent: Tue, 6 Nov 2007 4:45 pm
Subject: Re: [T27Owners] Re: Boom position on a close reach

By head stay sag I mean that while sailing I have gone

forward and looked up the head stay to asses how much

it sags or deviates from a line.  I estimate that it

deviates about 12 inches at its max.



I do have a turnbuckle on both stays so I could change

the tension if I wanted to, however I do not want to

over do it.  Which is why I wanted to measure it. 



As far as the specs I have the manual and one of the

alternate methods suggested, involves tightening by

hand and then putting 5 more turns on the turnbuckles.



I also need to check the mast rake, if it is to far

back I assume I could also have the excess weather

helm problem.



Can somebody estimate the maximum weather helm force

force on the tiller.  10 lb, 30lb,  50 lb.  what is

your best guess at max tiller force when is blowing

hard say 20 mph.



I have gone home after a long session with sore arms

and I am questioning if this is normal.





armando

hull 555 Magothy river/Chesapeake bay





--- Greg Van Pelt <greg.vanpelt@...> wrote:



> > 3) As far as the rig tuning I will like to be able

> to

> > measure the stays tension.  I do have some sag on

> the

> > head stay but I am not sure how much is

> acceptable.  

> > any thoughts here.

> 

> As Caleb mentioned, rig tune is achieved by use of a

> No. 90 or PT 2

> Loos gauge.  My recollection is that base rig tuning

> specs are in the

> Tartan 27 Owner's Manual published by the Chesapeake

> Bay Tartan

> Sailing Club.  I don't have access to my copy at

> present, but I'll be

> glad to check and post the recommended rig tuning.

> 

> I am somewhat curious regarding your statement about

> headstay sag. Do

> you have a backstay adjuster, and have you tried

> tightening the

> backstay tension, which would also flatten the main?

> 

> 





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