extreme variants of the proa are the ones designed for pure speed. These often completely discard symmetry, and are designed to sail only in one direction relative to the wind; performance in the other direction is either seriously compromised or impossible. These are "one way" proas, such as world record speed holding Yellow Pages Endeavour, or YPE. While the YPE is often called a trimaran, it would be more correct to call it a Pacific proa, because two of the planing/hydrofoil hulls are in line. This design has been considered by others as well, such as the Monomaran designs by "The 40 knot Sailboat" author Bernard Smith, and these designs been called 3-point proas by some, a reference to the 3 point hulls used in hydroplanes. A previous record holding design, the Crossbow II, owned by Timothy Colman was a proa/catamaran hybrid. Crossbow II was a "slewing" catamaran, able to slew her hulls to allow clear airflow to her leeward bipod sail. Although the hulls appeared identical, the boat had all crew and controls, cockpit etc. in her windward hull; the leeward hull was stripped bare for minimal weight. Speed records In March 2009, two new sailing speed records were set by vehicles based on the proa concept, one on land, and one on the water. On March 26, 2009, Simon McKeon and Tim Daddo set a new C-class speed sailing record of over 500 meters in the Macquarie Innovation, successor to their previous record holding Yellow Pages Endeavour, with a peak speed of . The record was set in winds of 22 to , and came close to taking the absolute speed record on water, currently held by l'Hydroptère. Conditions during the record-setting run were less than ideal for the Maquarie Innovation, which is anticipated to have a top speed of – . On March 27, 2009, Richard Jenkins set a world wind-powered speed record, on land, of 126.1 miles per hour (202.9 km/h) in the Ecotricity Greenbird. This broke the previous record by 10 miles per hour (16 km/h). The Greenbird is based on a one-way proa design, with a long, thin two-wheeled body with a third wheel to the lee acting as an ama. The aka, which is in the shape of a wing, provides a significant amount of downwards force at speed to counter the heeling force generated by the high-aspect wing sail. See also Austronesian