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Q. Are they really more powerful than spinnakers,
asyms and screechers?
A. Yes, they really are. The theoretical
arguments are compelling, but the real-world tests are better.
During our work for the America's Cup we performed two-boat testing
with identical J105 yachts and professional (America's Cup) crews.
Both boats had stock J105 mains. The control boat flew a stock
big J105 asym of 89 sq. meters and the kite powered boat flew
a 69 sq. meter OutLeader kite. In light conditions the bigger
sistership asym was a factor and the two boats sailed nearly even.
In medium air (12-18 kts), the kite powered boat was clearly superior,
repeatedly gaining 3-4 seconds/mile. In heavy air the kite boat
walked away because it could sail deeper than the sprit boat.
Even with their trimmers skilled in surfing Santa Barbara's offshore
waves, and even with all hands pumping both main and asym, the
smaller kite-powered boat consistently pulled away.
Q. Why wasn't the kite used in the 2003 America's
Cup? Isn't that what it was designed for? Did it fail somehow?
A. On the contrary. The OutLeader
kite succeeded beyond our expectations. It is this success which
convinced us to offer OutLeader spinnaker replacement kites to
the public.
Our AC client set the design bar very high for us. By the time
we scaled it, their management decided there was not time to prepare
the boats and crews to America's Cup skill level with a radical
new device in the 100 or so sailing days then remaining.
In their press release, Oracle BMW Racing's designer Chris Todter
was quoted, "Had we been able to develop this technology sooner
in our design cycle we would have been able to use it during the
Louis Vuitton Cup racing."
Q. Can I use your kite on my beach catamaran
or sailing dinghy?
A. The mission and intent of KiteShip
is to build large kites suitable for boats from about 20
foot up to mega yachts over 100 foot. The OutLeader kite is the
only kite which can be built and self-launched in large sizes
from boats in deep water.
We don't sell kites for beach cats or other small boats at this
time. Small kites (smaller than about 40 sq. meters) need very
lightweight lines - lines too small to hold in your hands. Kiteboarders
solve this by never touching their kite lines. They always fly
on full length lines and use a shore assist to launch their kites.
If this method is acceptable to you, we recommend you try a kiteboard
kite on your boat.
Q. Can I use one that's bigger than my current
spinnaker?
A. Yes you can. Since the kite's
total force leads to the deck of the boat, and since an OutLeader's
hoist is far shorter than an equal-sized spinnaker, users find
they can carry far larger kites than they could spins. Without
loading at the masthead, the mast is not endangered. More importantly,
there is no tendency for the boat to round up or broach without
masthead load. Since the kite's attachment points can be tweaked
even while fully loaded, helm balance can be finely tuned maintaining
good control even in very heavy air and at high speed.
Q. C'mon, legal spinnakers? Isn't this just
a rule cheater? What does PHRF/Americap/etc. say about it?
A. No. Besides the proven advantage of
more horsepower, there are fundamental advantages to ridding
a sailing boat of the dangers and downsides of mast-attached off-wind
sails. Heeling moment, broaching, helm imbalance, as well as cost
and complexity all favor kite spinnakers over conventional ones.
As to handicapping bodies, it is useful to remember that all
handicapping is designed to level the playing field between boats
of differing abilities. Kite powered boats advantages are still
largely unquantified. While both Americap and PHRF have offered
encouragement, only PHRF have actively rated OutLeader kites to
date. It's a chicken and egg thing... until sailors come forward
who are willing to take an artificially hard ratings hit, the
handicapping bodies won't have enough data to rate kites accurately.
On the other hand, there's always line honors to sail for.
Q. How do you launch / recover it?
A. OutLeader kites are launched similarly
to spinnakers. We use a temporary line from the kite's
retrieval patch to the hounds to assist in the launch. (The retrieval
patch is not where you'd think it is.) Since this gives the kite
multiple points at launch, we find that it is well under control
and launch goes easily and predictably. Unlike spins, the launch
sequence is fully reversible at any point, so tangles, hour-glassing
and other launch nightmares happen less often. Control is positive
enough that we have sailed away from moorings under kite power
alone, on very short lines. Takedown is also simple. If the crew
does not want to winch the boat up to the kite, they can partially
or wholly collapse it via the retrieval line and suck it back
to the boat very quickly. With a little practice this can be done
entirely airborne, even from very long lines. With a little skill
you can maintain some lift and suck it back at masthead height
or higher. We often launch and recover the kite completely dry.
Q. What happens when the kite "shrimps"?
A. Every spin eventually shrimps.
So does every kite. The difference is that OutLeader kites are
designed to survive the experience. If all lines except the tail
line are blown, the kite collapses like an umbrella and can be
sucked back even underwater. If the kite sags into the water while
flying (wind hole, for instance) it can often be relaunched via
the sheets without ill effect. Alternatively, it can be wholly
or partially retrieved via the retrieval line and relaunched often
far distant from the boat. Only as a last resort does it need
to be aborted and tail-dragged back in. Knock wood, we have yet
to shred a kite via shrimping. And of course, since the mast is
not involved during an abort, there's little danger to the rig.
Q. What happens at a crowded leeward mark?
A. Crowded marks in kite sailing races
aren't a new thing. Kite-powered land buggies have been
around for a long time. High speed heats with 50-100 kite buggies
are common. Mark roundings are fast, controlled and largely trouble
free. Check this
out for some photos. All the kite lines are parallel to each
other so it's very orderly for the participants. Kites are controllable
flying devices. You can fly over, under and between other boats'
kites. Boat length needs to be considered the length of the hull,
as you'd expect.
At a takedown, typically you'll either winch the boat up to the
kite bringing it to short lines early then douse as normal, or
over-stand the mark (with the kite, not the hull) then blow the
kite's shape and suck it back in a hurry just before the mark.
With some skill you will learn to keep the kite at or above masthead
height all the way in. Yes, you're going to need to practice this
to keep it out of leeward boats' rigging, but hey, you had to
practice spinnaker takedowns before you went near other boats
once upon a time, didn't you?
Q. Aren't those flying lines awfully thin?
A. KiteShip recommends using best quality
high modular lines for flying. Weight in the kite and its
flying system hurts performance. We use and recommend tapered
sheets and use very high quality Spectra or Dyneema for cores.
Dyneema SK75 is very strong - much stronger than any other line
for its weight. 1/4 inch SK75 core is stronger, all by itself,
than most 9/16 inch double braid polyesters at less than 1/6th
the weight. Even our lightweight 3/16 inch SK75 core is stronger
than most 7/16 inch polyesters. We recommend covering this core
for about half the length of your flying lines. We favor a custom
Spectra/Dyneema cover for even more strength, but polyester and
even polypropylene will work. In very large boats, we recommend
high melting point covers to avoid melting onto winches, and sometimes
non-HWMPE cores for the same reason.
Q. Can I use it on a shorthanded/single handed
boat?
A. Outleader kites are designed for fully
crewed boats. Their ability to fly without specialized
custom winches and additional gear for launch/recovery relies
on the ability of the crew to handle 3 winches. On the other hand,
we are learning tips and tricks to fly on fewer winches and even
on no winches at all. Under some conditions we fly with a single
crew plus the helmsman. We are learning as much from our customers
as they are from us. KiteShip Corporation represents OutLeader
kites as solutions for fully crewed boats. Your mileage may vary.
Q. What happens when the wind dies?
A. Well, you're not going to be sailing
when the wind dies, are you? Kites, like all flying structures,
have a stall speed - a minimum wind speed below which they will
not fly. OutLeaders need about 5-7 kts apparent to launch and
about 3-5 kts to continue flying. When the apparent wind drops
below this, the kite will not fly and will fall into the water.
So, spinnaker replacement kites are not appropriate for ghosting
conditions. A mast-supported spinnaker will be the better choice
then. Flying a spinnaker replacement kite is a cooperative effort
between the trimmer(s) and helmsman. The helmsman's job is to
maintain the apparent wind above the kite's minimum threshold,
sailing a higher course when necessary. Yes, sometimes this means
sailing above the rhumb line, meaning there'll be a need to sail
below it later. The other side of the coin is that you can sail
far below the rhumb line profitably when a puff comes through
all the while maintaining higher boat speed due to the kite's
greater power.
As skill levels rise, sailors will discover that they can keep
the kite moving in very light winds maintaining speed and control
and lots of power at a time when everybody else is floundering.
See Sailing VMG Courses below for more information.
Q. What happens when I "sail over"
the kite or sail into a wind hole?
A. This is similar to the situation above.
The helmsman needs to alter course to bring the apparent wind
up. An OutLeader kite can float in zero wind for awhile, but just
like any spin, its shape is going to suffer and eventually it
will fall into the water. There will be the need to reestablish
shape and air flow before you can get useful drive. Better to
head up a bit and maintain apparent wind. This may result in a
longer course, but often keeps the boat moving fast and puts you
ahead. You'll need to experiment on your own boat to determine
which technique (including striking the kite and raising a lightweight
spin) is best for each situation.
Q. What happens in higher winds with a big kite?
Aren't we just going to be over powered?
A. This is where it gets exciting.
Because the kite isn't driving the masthead forward, it does not
drive the bows down. In fact, it can be tweaked forward and can
actually lift the bows. This is especially relevant to multihulls.
Imagine driving the boat at high speed and the lee bow doesn't
get driven under.
In addition, without the strong torque at the masthead, the boat
has almost no tendency to spin out or broach, and the helm can
always be balanced keeping the rudder un-stalled even at high
speed. After many years of experience in kite-powered speed sailing,
we have yet to find an upper limit to the amount of kite power
a boat can absorb.
Q. How do I sail a dead downwind (VMG) course?
Won't I just run over the kite?
A. We've had much practice sailing
downwind VMG (velocity made good) courses, as these are all that
exist in IACC racing. Once again, specifics will vary for each
boat and wind/wave state, but generally it's a matter of sailing
to apparent wind. By maintaining the kite's minimum apparent wind
across the deck, the boat will take a snaking course sometimes
higher and sometimes lower (even DDW) while maintaining the best
VMG. This course will seem high at times, but will be very low
at others. In two-boat testing against identical J105's, we found
that this technique works. The kite can get to leeward faster
than spinnakers can.
Q. How do I fly it after dark?
A. There are two things which need to
be seen in order to fly an OutLeader kite; the leading
edge curl and the centerline's rotation. The first is the same
as any spinnaker. The second relates to whether the kite is beginning
to rise or beginning to sink. On moonlit nights, this visibility
isn't a great issue (staying away from dark colors is a good idea
as is flying on relatively short lines). On very dark nights we
have found mounting small lights on the kite works best - one
to illuminate the nose and leading edge and another farther back
to define the centerline. If this is illegal or unwarranted, you
can shine a torch on the kite just like any sail. Once a kite
spinnaker is properly trimmed, it needs only occasional trimming.
Kites automatically react to apparent wind direction. All you're
trimming for is power and to keep the kite steady in altitude.
Q. How much do they cost?
A. OutLeader kites largely use the same
materials and the same manufacturing techniques as high
quality spinnakers. They must be carefully engineered and built
to very light specs to maintain their low-wind ability and there
must be zero defects in manufacture. Because of this and because
we are a small company with relatively small production runs,
OutLeader kites cost a bit more than premium spinnakers. However,
they are a completely new and innovative technology. Their early
adopter premium is small compared to other innovative technologies.
For most boats, one kite can do the job of both symmetrical and
asymmetrical spinnakers. And of course, poles, struts, tracks
and a lot of controlling lines aren't needed. Taking this into
account, OutLeader spinnaker replacement kites are much less expensive
than spinnakers.
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