Yellow Pages Endeavour

The Yellow Pages Endeavour, or YPE, is an Australian sailboat designed for speed sailing, which held the outright 500 meter world record from October, 1993 to November, 2004, when it was taken by windsurfer Finian Maynard; the YPE still holds the B and C class records. [cite web |url=http://www.trampofoil.com/speedsailing/record.html |title=Yellow Pages Endeavour |accessdate=2007-10-30] [cite web |url=http://www.sailspeedrecords.com/content/view/14/16/ |title=Historical List Of 500 Metre Records |publisher=World Sailing Speed Record Council] The YPE has been succeeded in record attempts by the similarly designed Extreme 50, renamed Macquarie Innovation, built and operated by the same team.cite web |url=http://www.macquarie.com.au/speedsailing/background.htm |title=Background |accessdate=2007-10-30]

Design and construction

Designed by Lindsay Cunningham, the both boats are triscaph proa-like designs (though often referred to as a trimaran) intended for sailing in one direction. They have three hulls attached to a Y shaped aka. The ama, or windward hull, contains the cockpit and controls for the two crew members. The remaining two hulls travel in line, forming a vaka, or leeward hull. The rigid wingsail is attached to the center of the Y. The YPE used a high aspect sail, while the Macquarie Innovation uses a larger, lower aspect sail on a wider platform in an attempt to generate more power with less heeling force. Though the designs are often referred to as "foil born", the hulls are designed to plane, and both versions have been photographed with the ama lifted clear of the water. A series of cavitation resistant asymmetric foils, with fences to prevent ventilation at height speeds, are situated in the vaka hulls serve to provide lateral resistance.cite web |url=http://www.macquarie.com.au/speedsailing/design.htm |title=Design |accessdate=2007-10-30] cite web |url=http://www.macquarie.com.au/speedsailing/images/gall4.jpg|title=Photo of the Macquarie Innovation with the ama "flying" |accessdate=2007-11-01]

The construction of the load bearing portions of the vaka hulls and aka are primarily of unidirectional carbon fiber composite over a nomex core. These are then faired using heat shrink membrane over foam cores. The ama is constructed of lightweight marine grade plywood, and is designed to shatter and throw the crew clear of the cockpit in the event of a crash. The wingsail is made of a heat shrink membrane over a lightweight foam core.

Record attempts

In October 1993 skipper Simon McKeon and crew member Tim Daddo took the world record in the YPE with an official speed of 46.52 knots (53.5 mph or 86.2 km/h) off the coast of Sandy Point, Victoria, Australia. The record was set in winds of 19 to convert|20|kn|km/h|0, for a top speed of 2.3 times the windspeed. The Macquarie Innovation has already shown speeds of convert|43|kn|km/h|0 in 15—convert|17|kn|km/h|0 of wind, 2.5 times windspeed, and the team hopes that a good sailing day in convert|20|kn|km/h|0 of wind will break the convert|50|kn|km/h|0|sing=on barrier. [cite web |url=http://www.seasailsurf.com/seasailsurf/actu/spip.php?breve782 |title=Speed record : Macquarie Innovation’s November campaign summary ends at convert|43.26|kn|km/h|0 |accessdate=2007-10-30]

Difficulties

The YPE and MI designs are highly specialized craft, designed to operate only under ideal conditions for record attempts. The location, Sandy Point, provides the unusual combination of very smooth water and high winds needed for record attempts.cite web |url=http://www.macquarie.com.au/speedsailing/venue.htm |title=Venue |accessdate=2007-10-31] Even so, times when ideal conditions are available are scarce; in the 2007 season, one 28 day period yielded only 1.5 hours of good sailing time, in a convert|17|kn|km/h|0|sing=on wind, not enough for a record setting performancecite web |url=http://www.macquarie.com.au/speedsailing/updates.htm |title=Updates|accessdate=2007-10-31] Every run also risks a crash, which, due to the lightweight nature of the craft, can result in disaster, such as in 2004 when a capsize destroyed the Macquarie Innovation.cite web |url=http://www.seasailsurf.com/seasailsurf/actu/spip.php?breve2961 |title=Speed Record : Foiler Macquarie Innovation capsizes half way through a record attempt run in 18 - convert|20|kn|km/h|0|sing=on winds |accessdate=2007-10-31] cite web |url=http://edition.cnn.com/2002/WORLD/sailing/12/05/speed.tech/index.html |title=Aussies go for speed record |accessdate=2007-10-31] When this happens, the vessel must be rebuilt, costing time, money, and possible good sailing days. On the other hand, the YPE set the world record only 8 months after a crash that wrecked the vessel.

References

External links

* [http://www.macquarie.com.au/speedsailing.htm Macquarie Speed Sailing] official website, with information on the Macquarie Innovation
*Pictures of a Macquarie Innovation [http://stanblaz.customer.netspace.net.au/macquarie/macquarie_2005_01.html sail failure] and the [http://stanblaz.customer.netspace.net.au/macquarie/macquarie_2004_03.html cockpit after a crash] .
* Paravane (water kite)