Carbon Fibre Spars
UK
The technology
Using the very latest technology,
carbon fibre manufacturers bring to the dinghy and
yachting world carbon fibre spars that herald a new dawn
in the design of production CF rigs.
The latest CF spar range features
super efficient profiled shapes.
The ‘Tear-Drop’
profile gives the spar the required stiffness ratios fore and
aft to counteract the upwind kicker loads. Also, because of its
aerofoil shape, the profiled section of the carbon fibre tube
has improved air adhesion compared to a round tube, meaning
that the spar will directly increase lift and reduce drag and
so allow a cleaner air entry onto the luff of the mainsail. In
real terms, this means the boat can point higher and go
faster.
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The
production technique
The alignment of
composite fibres, according to the carbon fibre tubes and spars
manufacturers, is central to the performance characteristics of
these revolutionary spars. This allows the designer huge scope
for tailoring the main and topmast section characteristics. The
fibres are also laid under tension, which enables the
manufacturer to provide the most efficient material choice, and
the lightest spars on the market.
Comparisons with
alloy ?
Although CF spars have
been around for more than a few years now it's only recently
they've become more obtainable and affordable to the average
club sailor. Like any new product or materials in the
development stages, the process to establish a proven product
is fairly long-winded. However, with more and more dinghy and
small keelboat sailors notching up the results with their new
radical, black sticks, it seems likely alloy masts could be on
the way out. There is no doubt that the pioneers in
construction of carbon fibre masts are the cottage industry
boat builders and spar makers who are passionate about their
work, and have now become dedicated CF spars manufacturers. So
how do these spars compare with alloy spars? Despite the fact
this man made material is made from tiny featherweight strands
of fibres, carbon fibre tubes are
incredibly strong. Unlike an alloy mast, which when over
stressed will either break or take up the inevitable
banana-shaped kink, CF will return to its original shape, in
either one piece or two! And because dinghy racers are always
striving to keep the weight down for optimum speed, reducing
the amount of kilos up the mast to prevent pitching is the aim
of all.
The
benefits
The leading
CF mast and boom manufacturers in the world claim
that these new spars enjoy improved stiffness ratios and
aerodynamics, improved gust control, and an immediate
performance effect with improved strength and
durability.
Through the use of
carbon fibre a mast can be manufactured which is lighter and
stiffer than an aluminium mast. This can significantly improve
the performance of the rig. There are 2 main manufacturing
methods employed in the construction of a carbon
mast.
The first is to use a
standard section mould to produce a uniform section throughout
the length of the mast. This is the cheapest type of carbon
mast as the moulds used to make the standard section can be
used more than once. They can be built as "one-offs" for a
particular yacht.
This type is more
expensive since a mould has to be constructed to the
specifications of the mast, this mould can usually only be used
once. The main problem with carbon is the additional cost
of the materials and the increased labour involved. A typical
carbon mast will be approximately 7 times the cost of an
aluminium mast.
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