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Batten A thin plastic, wooden or fibreglass/resin strut slotted, usually horizontally, into a sail to tension the material in order to improve its aerodynamics
Boat Balance The side to side heeling of the dinghy. In general crew should distribute their weight such that the dinghy is sailed flat, ie little or no heeling, in all circumstances
Boat trim The fore and aft attitude of the dinghy. Forward trim is when the bow is cutting into the water with the stern almost out of the water - Aft trim is the reverse. Trim can be viewed as the crew leans over the side as the dinghy heels. You will note that the bow is either in or out of the water.
Clew The rearmost corner of a sail, used to set the sail position and / or tension
Close-Hauled The term used to describe a dinghy sailing on the edge of the no-sail zone, making best progress towards an upwind position.
Cringle Eyelets in the three corners (Tack, Clew and Head) of the sails
Gybe  With the wind at its stern, the dinghy changes direction such that the wind blows on the other side of the mainsail. Following a gybe the movement of the boom can be sudden and swift.
Head  The topmost corner of a sail, used to hoist the sail
Hiking The position adopted by the crew members when leaning out over the side of the dinghy, with toes hooked under the toe straps to the degree needed to counterbalance the heeling attitude of the dinghy.
Jib-Cars The two travelling sliders to which the Jib pulley blocks are fastened. These are sited on the port and starboard gunwhales in the forward section of the Xenon. See Tuning section for settings
Leech The rearmost or trailing edge of a sail
Luff The front or leading edge of a sail
Mast Rake The angle at which the mast slopes rearwards.
No-sail zone The area extending approx 45° either side of the current wind direction into which a sail boat will not sail.
Outhaul The control line protruding from underneath the front of the boom. Used to tension the Foot of the main sail. As a starting point tension the Outhaul so that 4 outstretched fingers of your hand can be inserted at the mid point of the sail Foot.
Plane Describes the behaviour of the Xenon when running at speed, often with the Gennaker flying. At low speed the Xenon operates in displacement mode and has a maximum speed of around 5 knots, however as the downwind power increases the Xenon is designed to lift its bow out of the water and ride on its bow wave. As this happens the drag resistance on the hull falls away and the Xenon accelerates even further, the bow rising still further as the crew weight shifts rearwards. At this point the water from under the stern is smooth and quiet and a wave can be seen following the dinghy and the spray flies and adrenaline flows!
Roach The additional material inserted into a sail between the Head and the Clew. This adds a degree of 'bagginess' to the sail increasing its power. Battens are often used to stiffen / tension this additional material, that would other hang loose and impede wind flow over the sail.
Sheet Term used to describe a rope controlling a sail.
Tack (noun) The lower foremost corner of a sail
Tack (verb) To change the dinghy direction approx 90° through the eye of the wind
 Tell-Tales  On the Jib these take the form of small pieces of wool fastened approx 100mm inside the Luff of the Jib sail. There are 3 pairs of Tell-tales on the Jib and are used to indicate the air flow over the sail. See the Sailing Guide for information on using these.

Training Run 

The name given to a point of sail. The Xenon is pointing almost downwind on either a port or starboard tack. Most dinghies are a little unstable when being sailed directly downwind and with its powerful rig the Xenon is no exception. This is often apparent when the dinghy begins rolling from side to side. By sailing slightly off the downwind point the dinghy sails in a steadier fashion. This point of sail is important to the launch and retrieval of the Xenon gennaker sail - allowing the sail to gently inflate or keeping it slightly inflated as the retrieval begins.