surfboard geometry and design image source:
TRANSCRIPT
Surfboard Geometry and Design
Image Source: http://wikimedia.org
Latest Technology Board Riding
Source: http://www.youtube.com/watch?v=GwVnq_t-Wc4
Types of Surfboards Choosing a Surfboard Parts of a Surfboard Surfboard Fins Fin Configurations Making Surfboards by Hand Computer Design and Manufacture
Surfboard Geometry and Design
Types of Surfboards
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The Shortboard
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High Performance, Sharp Nose, Thin Rail Edges, Highly Curved Deck, Three or Four Underside Fins
The Fish
Images Source: Google Images
Shorter, Wider, and Flatter than the Shortboard; works well in small mushy surf.
The Longboard
Image Source: http://surfingaustralia.com
Oldest design, Rounded Nose, Long and Wide,Great for small waves and Beginner Surfers.
The Longboard
Source: http://www.youtube.com/watch?v=xNMLOCNo4BY
Brazilian Surfers Nose Riding on Longboards.
The Funboard
Image Source: Google Images
Smaller than Longboard, thick and long giving Buoyancy volume, paddling power, and stability.
The Gun
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Special Board for Huge Waves. Very Long for PaddlingSpeed. Designed for very High Speeds and Control.
The Hybrid
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The typical hybrid is a larger and wider version of either the Shortboard or the Fish. Great for medium size days.
Other Types / SUP
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The Stand Up Paddle Board “SUP” gives four times thePaddling power of a normal surfboard. Tow-In Boards with Jet-Skis used for Big Wave entries.
Choosing a Surfboard
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Detailed Sizing Charts are used for the Type of Board you need for your height, weight, and surfing style.
Parts of a Surfboard
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Changing the Geometrical Shape of each part significantlychanges acceleration, stability, hold, and manoeuverability.
Fins
The Nose
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Pointy - dropping into big waves, and paddling in chopRound - easier to paddle, glide, and plane on the surface.
The Rocker
Image Source: http://konaboys.com
Rocker is the curving upwards of the deck (nose and tail)Fish and Longboard (small waves) have minimal rocker.
The Stringer
Image Source: Google Images
Stringer - stiffener placed down the middle of the board to strengthen the core and add rigidity.
The Rails
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The “Rail” edges of the surfboard are rounded (“soft”) on Longboards for stability and tracking, but go to a rightAngle (“hard”) shape where they meet the bottom of Shortboards to give acceleration and tight turning.
Squared off bottom“Hard” Rail profilealong the edgeof a Fish Board from Nose to Tail.
Tail Shapes
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Round / Pin – stable in big surf, smooth round turnsSquash / Square – more lift, plane, pivot, loose sharp turnsSwallow / Angular – Quick water release for mushy waves
Surfboard Fins
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Fins are required to turn the board, stop sideways slipping, and hold the board onto the face of the wave.
Surfboard Fins Tutorial
Source: http://www.youtube.com/watch?v=nm57d4C9rZs
There are many Fin Types, Shapes, and Arrangements.
Fin Characteristics
Source: http://surffcs.com.au
There are key measurements which define each fin type.
Foils on Fins
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Fin Profile called “Foil” critically affects turning, hold onthe wave face, drive acceleration, and stability.
Foils on Fins
Information Source: http://fcs.com.au
There are four common Fin Profiles or “Foils”
Foils on Fins
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Drive, (Speed), Pivot (turning) and Hold/Release
Foils on Fins
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Flex and Cant on Fins
Original Images Source: Google Images
Detailed Fin Measurements
Image Source: htttp://wavegrinder.com
Bulbous Bullet Fin
Image Source: htttp://bulletfins.com
Fin Base Profile pushes up a “Bulbous Wave” at 180degrees to the fin cutting wave to create cancellation.
Evolution of Fin Technology
Source: http://www.youtube.com/watch?v=mCfXlSa7VE4
The incredible acrobatic surfing we see today is dueto the evolution of Fins over the last ten years .
FCS Fins Australia
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FCS Fins Australia are world leaders in Fin Technology,and continue to create exciting new products.
Fin Configurations
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Depending on Surfboard Type, there can be 1 to 4 fins used.(Five fin boxes under the board allows for Tri or Quad).
Bottom Contour
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Bottom contours influence how water travels under the surfboard, and assists lift, planing and manoeuverability.
Surfboard Deck
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Decks are either flat or domed and slippery fibreglass needs thick wax or rubber grips applied to it.
Making Surfboards
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“Shapers” turn a foam blank into a proper surfboard using cutting and measuring tools, sanders, fibreglass, and resins.
Making Surfboards
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An order form and detailed plan is used to measure andmake each surfboard to the customer’s requirements .
Handmade Surfboards
Source: http://www.youtube.com/watch?v=d9Lly3VMW_A
“Shapers” and “Glassers” hand make custom surfboards.
Handmade Surfboards
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“Shapers” use special measuring tools.
Computer Design and Manufacture
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Modern Surfboards are mass produced using computeriseddesign / scanning equipment as well as shaping machines.
Computer Design and Manufacture
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A “real” Surfboard is made by a master shaper and then Scanned to store all of its 3D Geometrical characteristics.
Computer Design and Manufacture
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The Board can be customised and then automatically cutout and fully shaped using computer controlled machinery.
Hybrid Design
Images Source: Google Images
This design wouldn’t “Float” as a Surfboard, and makes q difficult guitar to dance around with, but is interesting.
Mathematics of Surfing
Complete details of all material coveredin this presentation can be found in the“Mathematics of Oceans” lesson on thePassy’s World of Mathematics Website:
www.passyworldofmathematics.com