Leading edge (LE): The leading edge of an a foil surface such as a wing is its foremost edge and is therefore the part which first meets the oncoming flow (air or water).
Trailing edge (TE): The trailing edge of a foil surface such as a wing is its rear edge, where the airflow separated by the leading edge meets
Lift: Aero/hydro dynamic lift forces that enable wings to fly.
Drag: Aero/hydro dynamic drag forces that slow the wing down.
Centre of gravity (C of G): Where the sum of a wings’s weight forces act.
Centre of lift (C of L): Where the resultant of lift forces act.
Centre of pressure (C of P): Where the resultant of lift and drag forces act.
Lateral area: The mast or winglets, and other vertical (as opposed to horizontal) area.
Span: the wing’s width from tip to tip.
Chord: the wings’s measurement from LE to TE.
Aspect ratio: Span relative to chord, technically; span squared divided by area.
Angle of attack (AoA): angle that the water/air strikes a wings’s lifting surfaces at.
Luff: When a hand wings’s leading-edge dips under the wind, causing the wings’s fabric to flap and lose tension. Typically by holding the hand wing by the leading edge handle will result in a luffing canopy.
Stall: When the flow around the foil is not fast enough and the foil drops down through the water column.
Dihedral: The upward inclination of the wing tips in relation to the the central fuselage (tips higher than fuselage).
Anhedral: The downward inclination of the wing tips in relation to the the central fuselage (tips lower than fuselage).
Base Plate: Used to attach the mast to the board. More commonly these days it is manufactured to the mast. There are four holes at each corner, allowing the bolts to be fixed to the board.
Tuttle Box: A connection system of attaching a mast to a board. It is an alternative method to a base plate. A key point is there are multiple Tuttle box dimensions.
Mast: The vertical section that connects the board to the fuselage.
Mast Head: The top of the mast that connects to the base plate or board.
Mast Foot: The base of the mast that connects to the fueslage.
Fuselage: The horizontal section connects the mast to the front wing and stabiliser.
Front wing: The larger wing that produces lift.
Stabiliser: The smaller wing is located behind the mast (this is not a back wing or tail wing).
Stabiliser Shim: This allows the AoA of the stabiliser to be adjusted.
Base Plate Shim: If your board has rocker in the rear, place thickest part of shim towards nose of board under base plate to lift nose of board.
Natural Footer: Standing on board with Left foot forward.
Goofy Footer: Standing on board with Right foot forward.
Pump out of a hole: To combine physical energy and technique to launch the board off the water surface so the foil can provide lift.
Displacement mode: When the board is on the water, and the foil is not providing lift.
Port: Facing forward, this is anything to the left . You can use this term pretty much any
time you would normally say “left.”
Starboard: Facing forward, this is anything to the right of the boat. Same deal as “port”–only the opposite.
Tack: This term has two distinct meanings, both of them very important. As a verb, to tack is to change direction by turning the nose of the board through the wind. As a noun, your tack is the course you are on relative to the wind.
Port tack: Left arm forward. If the wind is blowing over the port side, you are on a port tack.
Starboard: Right arm forward. If it’s blowing over the starboard side, you’re on a starboard tack.
Jibe: A jibe is another way of changing direction, in which you bring the stern of the boat through the wind. Whether you choose to tack or jibe entirely depends on the situation–what’s around you, and the direction of the wind.
Windward: The side of the board closest to the wind.
Leeward: The side of the board furthest from the wind.
Bear-off: Change course away from the wind.
Chip in: A prone foiling term for catching any type of wave to get up on the foil. A shift from surfing where quality is sought from each wave. Foiling offers extended snowboard-like runs after the chip, focusing on the greater environment rather than the wave you catch. Olly Brunton.
Downwinders: Depart from the coast and ride down wind to an alternative exit point. Depending on rider ability, equipment may include: Wingfoiling, SUP-foiling or Prone foiling.
Bump: A short lived peak of rolling swell energy that is slightly higher than the surrounding ocean surface.
Shore Runner: A combination of prone foiling in waves combined with down winding, typically with side shore wind conditions. Get up on foil by “chipping in”, then pump out to larger surf.
Lockout: When you are unable to turn tightly. May occur in large surf at faster speeds. Hint: consider reducing size of stabilizer.