06 May 2008 12:59:39
bertbarndoor
Info advice on mast extension, foot, and boom please???

Hi, should I be considering anything when purchasing a mast extension,
foot, and boom please??? Are the footings board specific *Starboard
Rio M 2008*? If I have a choice between 2 sizes of mast extension,
what are the differences in length all about? Also for size of the
boom, if I am going to get a 6.5 sail now, maybe a 7.5 down the road,
what size boom should I get??? Thanks,

Rob


06 May 2008 16:12:54
rod.r
Re: Info advice on mast extension, foot, and boom please???

hi rob

as long as the base and extension match, it's personal
preference...either US pushpin or europin

most extensions come in either around 25cm and around 45cm. for a 6.5
and 7.5 on a 460
you could get away with a 25cm extension. personally i just have a
48cm extension for all my sails from 6.2
to 9.0 but some argue against a lot of extension inside the mast which
is a valid point....alu extensions are fine

a typical 6.5 sail might have a 465 luff and 195 boom
a typical 7.5 sail might have a 485 luff and a 215 boom

a common boom size is around 180-240 which will cover down to around a
6.0 and up to around an 8.0
i have a 190-250 carbon boom which again does all my sails 6.2 to
9.0.
if people in your area routinely use bigger sails and
you think an 8.5 or 9.0 might be an eventual sail size you'd use,
then i'd try for something like a 190-250 carbon for a 6.5 / 7.5 /
8.5(9.0)

there's nothing more frustrating than wanting that slightly bigger
sail and having a boom too short by a few cm's
(which i have done a couple of times)


07 May 2008 00:15:38
mbad@rogers.com
Re: Info advice on mast extension, foot, and boom please???

Rob,
while 6.5 and 7.5 are common sizes, you could find that on a VERY
light wind days, the gap between those 2 is relatively small (think
% difference - not huge) Perhaps 6.5 and some 8.X would be better..

Over at my (often too quiet) lake many sailors use 8+ or 9+, or even
11+ sails! As long as you could uphaul one...

If you are buying the 6.5 first, get a boom that just covers that
size and spans as much as possible towards the larger sail to keep
options open. No boom will cover all sizes from 4m to 9m, so you'll
end up with 2 booms eventually, the other one dedicated to small
sizes (less that 6.5).

For sail sizes google "sail quiver gap calculator" - will help
optimize your picks

good winds,
Marek

+++


Marek

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06 May 2008 18:49:35
sailquik (Roger Jackson)
Re: Info advice on mast extension, foot, and boom please???

Hi Rob,
The 2008 Rio M uses a normal "twist plate"with a Starboard brass T-
nut.
The T-Nut comes with your board and should be wrapped in the little
bubble wrap
bag with the fin screws.
The reason you need the Starboard T-nut (vs a std. plate nut) is that
some mast base/
universal joints do not have a long enough 5/16-18 thread sticking out
the bottom to accomodate
the EVA deck pad. The brass Starboard T-Nut solves this problem.
As far as you mast extension, that will depend on the length of the
mast you buy (probably a
460 cm) and the luff length of the sail you buy.
You need to have enough extension to be able to extend you mast to the
specified luff length
(mast length + extension). It's a good idea to have a few cm extra as
you may need to really downhaul
your sail to make it more suitable for higher winds and overpowered
conditions.
BUT
If you don't need the Tall (43-45 ccm of extension adjustment (holes
or grooves in the extension) get the medium
25 cm adjustment extension as too much extension up in side the bottom
of your mast can cause problems.
If you only need a few cm of extension on your mast, to achieve the
recommended luff length, then you can 'get a
"stubby" extension (they come in 2 flavors 0 adjustment, and 15 cm
adjustment.
You need to buy a boom that will go about 10-15 cm longer than the
stated boom length (clew length) for you 6.5 m2 sail.
If you are planning to upgrade from a 6.5 to a 7.5, I'd go a little
longer on the boom to accomdate a 7.5.
Yes it adds a little weight, but a boom that isn't extended all the
way to the max. is normally stronger.
You may need to purchase a tall extension when you upgrade to the 7.5
m2 rig (depends of the sail makers luff
length specification. To upgrade from a 2008 6.5 m2 Sailworks Retro
(with the new clew configuration) to the 2008 7.5 m2
Retro, you would need a boom that covers


Here's the specs for the 2008 Retro 6.5 and 7.5
Retro 6.5 473 Luff length (460 mast + 13 cm of extension. Boom
length 186 cm min. 191 cm max.
Retro 7.5 495 Luff length (460cm mast with 35 cm of extension. Boom
length 206 cm min. 211 cm max.
So, for these 2 sails specifically you would need a boom that adjusts
from about 170 cm- to 230 cm
(HPL Slalom size) .
You would need 2 extensions, a mid size (25 cm adjustment) and a tall
extension (45 cm) to cover both sails.
Hope this helps,



On May 6, 3:59=A0pm, bertbarndoor <bertbarnd...@gmail.com > wrote:
> Hi, should I be considering anything when purchasing a mast extension,
> foot, and boom please??? Are the footings board specific *Starboard
> Rio M 2008*? If I have a choice between 2 sizes of mast extension,
> what are the differences in length all about? Also for size of the
> boom, if I am going to get a 6.5 sail now, maybe a 7.5 down the road,
> what size boom should I get??? Thanks,
>
> Rob