Surfboard Geometry and Design Image Source http wikimedia

Surfboard Geometry and Design Image Source: http: //wikimedia. org

Latest Technology Board Riding Source: http: //www. youtube. com/watch? v=Gw. Vnq_t-Wc 4

Surfboard Geometry and Design v Types of Surfboards v Choosing a Surfboard v Parts of a Surfboard v Surfboard Fins v Fin Configurations v Making Surfboards by Hand v Computer Design and Manufacture

Types of Surfboards Image Source: http: //sandiegosurfingschool. com

The Shortboard High Performance, Sharp Nose, Thin Rail Edges, Highly Curved Deck, Three or Four Underside Fins Image Purchased by Passy World from Dreamstime. com

The Fish Shorter, Wider, and Flatter than the Shortboard works well in small mushy surf. Images Source: Google Images ;

The Longboard Oldest design, Rounded Nose, Long and Wide, Great for small waves and Beginner Surfers. Image Source: http: //surfingaustralia. com

The Longboard Brazilian Surfers Nose Riding on Longboards. Source: http: //www. youtube. com/watch? v=x. NMLOCNo 4 BY

The Funboard Smaller than Longboard, thick and long giving Buoyancy volume, paddling power, and stability. Image Source: Google Images

The Gun Special Board for Huge Waves. Very Long for Paddling Speed. Designed for very High Speeds and Control. Image Source: http: //wikimedia. org

The Hybrid The typical hybrid is a larger and wider version of either the Shortboard or the Fish. Great for medium size days. Image Source: http: //surfingaustralia. com

Other Types / SUP The Stand Up Paddle Board “SUP” gives four times the Paddling power of a normal surfboard. Tow-In Boards with Jet-Skis used for Big Wave entries. Images Source: Google Images

Choosing a Surfboard Detailed Sizing Charts are used for the Type of Board you need for your height, weight, and surfing style. Image Source: http: //surfertoday. com

Parts of a Surfboard Changing the Geometrical Shape of each part significantly changes acceleration, stability, hold, and manoeuverability Fins Image Source: http: //renasis. com

The Nose Pointy - dropping into big waves, and paddling in chop Round - easier to paddle, glide, and plane on the surface. Image Source: http: //surfingaustralia. com

The Rocker is the curving upwards of the deck (nose and tail) Fish and Longboard (small waves) have minimal rocker. Image Source: http: //konaboys. com

The Stringer - stiffener placed down the middle of the board to strengthen the core and add rigidity. Image Source: Google Images

The Rails The “Rail” edges of the surfboard are rounded (“soft”) Longboards for stability and tracking, but go to a right Angle (“hard”) shape where they meet the bottom of Shortboards to give acceleration and tight turning. Squared off bottom “Hard” Rail profile along the edge of a Fish Board from Nose to Tail. Image Source: http: //swaylocks. com on

Tail Shapes Image Source: http: //surfertoday. com Round / Pin – stable in big surf, smooth round turns Squash / Square – more lift, plane, pivot, loose sharp turns Swallow / Angular – Quick water release for mushy waves

Surfboard Fins are required to turn the board, stop sideways slipping, and hold the board onto the face of the wave. Image Source: http: //mpora. com

Surfboard Fins Tutorial There are many Fin Types, Shapes, and Arrangements. Source: http: //www. youtube. com/watch? v=nm 57 d 4 C 9 r. Zs

Fin Characteristics There are key measurements which define each fin type. Source: http: //surffcs. com. au

Foils on Fins Image Source: http: //surffcs. com. au Fin Profile called “Foil” critically affects turning, hold on the wave face, drive acceleration, and stability.

Foils on Fins There are four common Fin Profiles or “Foils” Information Source: http: //fcs. com. au

Foils on Fins Image Source: http: //surffcs. com. au Drive, (Speed), Pivot (turning) and Hold/Release

Original Image Source: http: //www. fcs. com. au Foils on Fins

Flex and Cant on Fins Original Images Source: Google Images

Detailed Fin Measurements Image Source: htttp: //wavegrinder. com

Bulbous Bullet Fin Base Profile pushes up a “Bulbous Wave” at 180 degrees to the fin cutting wave to create cancellation. Image Source: htttp: //bulletfins. com

Evolution of Fin Technology The incredible acrobatic surfing we see today is due to the evolution of Fins over the last ten years. Source: http: //www. youtube. com/watch? v=m. Cf. Xl. Sa 7 VE 4

FCS Fins Australia Images Source: htttp: //fcs. com. au FCS Fins Australia are world leaders in Fin Technology, a nd continue to create exciting new products.

Fin Configurations Depending on Surfboard Type, there can be 1 to 4 fins used. (Five fin boxes under the board allows for Tri or Quad). Images Source: Google Images

Bottom Contour Bottom contours influence how water travels under the surfboard, and assists lift, planing and manoeuverability. Image Source: www. shapers. com. au

Surfboard Decks are either flat or domed and slippery fibreglass needs thick wax or rubber grips applied to it. Image Source: htttp: //vimeocdn. com

Making Surfboards “Shapers” turn a foam blank into a proper surfboard using cutting and measuring tools, sanders, fibreglass, and resins. Image Source: htttp: //vimeocdn. com

Making Surfboards An order form and detailed plan is used to measure and make each surfboard to the customer’s requirements. Image Source: htttp: //hollowboards. com

Handmade Surfboards “Shapers” and “Glassers” hand make custom surfboards. Source: http: //www. youtube. com/watch? v=d 9 Lly 3 VMW_A

Handmade Surfboards “Shapers” use special measuring tools. Image Source: http: //foamez. com

Computer Design and Manufacture Modern Surfboards are mass produced using computerised design / scanning equipment as well as shaping machines. Image Source: http: //borstdesigns. wordpress. com

Computer Design and Manufacture A “real” Surfboard is made by a master shaper and then Scanned to store all of its 3 D Geometrical characteristics. Image Source: http: //borstdesigns. wordpress. com

Computer Design and Manufacture The Board can be customised and then automatically cut out and fully shaped using computer controlled machinery. Images Source: http: //borstdesigns. wordpress. com

Hybrid Design This design wouldn’t “Float” as a Surfboard, and makes q difficult guitar to dance around with, but is interesting. Images Source: Google Images

Mathematics of Surfing Complete details of all material covered in this presentation can be found in the “Mathematics of Oceans” lesson on the Passy’s World of Mathematics Website: www. passyworldofmathematics. com