Help: Rigging a 5.0 NP MkII WC Slalom Sail

Help: Rigging a 5.0 NP MkII WC Slalom Sail

Post by Mike Eglingto » Sat, 24 Jun 1995 04:00:00


I have a 5.0 Neil Pryde MkII World Cup Slalom sail, which I can't rig to
my satisfaction:

I am rigging it on a North 2-piece carbon race mast (or at least that is
what I am told it is: I bought the sail and mast from separate people at
the Windsurf Wherehouse swap meet in S.F. last Saturday). I think the mast
is carbon, because it is black, with black fibres running longitudinally
down the mast. Each piece of the mast is 220cm long, and it is almost a
perfect length for the sail.

My problem is that while I can get what I consider to be appropriate
camber in the lower half of the sail (i.e. the lower 3 cam'ed battens), I
think that the upper half (i.e. the upper 2 cam'ed battens and the top
uncam'ed batten) is way too flat, in fact the outer edges of these battens
almost have negative camber.

I have tried adjusting both the downhaul and outhaul: By adjusting the
outhaul, I can get a wide range of cambers in the lower 3 battens (from
deep to flat), but it has little effect on the upper 3. By adjusting the
downhaul, I can (as expected) make the leech looser (more downhaul) or
tighter (less downhaul) at the upper battens. The problem is, tightening
the downhaul makes the upper three battens very flat: with enough downhaul
the leech becomes very loose, and the upper 3 battens start to get
negative camber in the outer half of their length.

First, I don't like the negative camber, and second, even with a loose
leech, I would expect/like the sail to have an approximately constant
camber-to-chord ratio from foot to head. (This is how most of the sails I
see in the brochures and on the beach look.) Also, I would expect that I
could adjust this camber-to-chord ratio for light and strong wind
sailing.

So, what am I doing wrong? Is it as I suspect that the top half of my mast
is not stiff enough? Unfortunately, I can no longer read the markings on
the mast. Is it possible that I got a stiff lower half and flexible upper
half? Or is there something else I am doing wrong?

Thanks for the advice.

Michael L. Eglington

Tel: (415) 497-2316

 
 
 

Help: Rigging a 5.0 NP MkII WC Slalom Sail

Post by Walter Clar » Wed, 28 Jun 1995 04:00:00

Quote:

> I have a 5.0 Neil Pryde MkII World Cup Slalom sail, which I can't rig to
> my satisfaction:

It kind of sounds like you have a flex top mast in that North.  Not
too surprising since that has been the norm for North sails in years
past.  

See if you can borrow a different brand carbon constant curve mast
(like a Fiberspar red - any model, or an NP Carbon 40-60) about
430cm/MCS25, just to see how it rigs.

Walt

 
 
 

Help: Rigging a 5.0 NP MkII WC Slalom Sail

Post by Mike Eglingto » Wed, 28 Jun 1995 04:00:00

Thanks to all who replied to my question about rigging the NP WC
Slalom. As everybody concluded, the flextop mast doesn't suit the sail. So
I bought a constant curve FiberSpar mast, which works great.

Now I just need to sell the flextop North mast. Hopefully there is someone
out there in the SFBay area looking for a flextop mast to match his/her
North sails.

From speaking to people at the Helm swap meet on Saturday (where nobody
wanted to buy flextop masts :-( ), I have concluded that it is a:

 North carbon race mast
  - 2 piece: 2 x 220cm
  - good condition
  - very light
  - flextop

I would like to recover the $80 I paid for it at the Windsurf Wherehouse
swap meet.

Call me or email me if interested.

Michael L. Eglington

Tel: (415) 497-2316

 
 
 

Help: Rigging a 5.0 NP MkII WC Slalom Sail

Post by Al Eise » Wed, 12 Jul 1995 04:00:00

Along with your comments, I've heard that North masts are often stiffer
than their MCS ratings indicate. So much for a useable rating system!