Open Source Kayak

Basics

• A small watercraft that usually sits one person
• Is propeled by a hand paddle
• Can be made of many materials; The most common are all rigid plastic, but some inflatable ones have emerged which can be deflated to very small sizes (such as an average backpack/tote bag)
• 70 CM +/- a few cm seems to be the standard width

Industry Standards

• High End Option ~1,000 USD
• Lower End Option ~500 USD
• Point65 Tequila Modular SOT Kayak ~1600 USD
• [https://mikeshouts.com/mfk003-modular-standing-fishing-kayak-by-fissot/ Intresting Design with Fold Out Stabalizers for Stand Up Use (Can it act as a SUP, or just stationary use?)

Existing Open Source Designs

• CNC Kayaks (They Make CNC Plans for Wooden Ones)
• This 3D Printed One (in many sections) by grass roots engineering

Basic Design

Surface Treatment for any model

• Print Part
• Sand down
• Coat in thin film of epoxy/silicone (Perhaps 2-3 x to be sure of good seal?)
• Sand + Buff
• Do this for the inside and outside
• Also optional addition of Anti-Skid Coatings/materials on the inside

Sit On Top (SOT)

One Piece 3D Printed Plastic

• Would require a HUGE D3D , or use a Belt 3D Printer

Multi Piece 3D Printed Plastic

• The more reasonable option
• The Kayak it is broken into shorter segments which can be broken apart for storage then reattached for use
• Also allows for a modular build (ie seat section, basic hull section, footrest section, fishing rod holder/cargo section, bow section, stern section, etc)

How Pieces Will Be Connceted

• Can epoxy + Friction stir weld the edges for permanent
• For breakdown-able ?
• The Point65 seems to use joinery held together by straps?
  • Can this hold up the rough water?
• Can Metal Latches be Used?
• Bolts etc could work, and would be sturdy, main issue is time taken to connect/disconnect
• ALSO will a gasket be needed?

Estimated Cost

• Need to determine infill needed. The Existing Design used~28kg of abs (double check this)
• The "grassroots engineering" design was sit inside, so ~2x the material?
  • They used 26.48kg of ABS
• Guessing a similar size would be:
  • Bow Module
  • Footrest Module
  • "blank" Hull module
  • Seat hull module
  • Cargo and/or blank module
  • Stern Module
• SO ~6 Modules
  • And thus 10 latches for joining them?

BOM

• A Potential Latch for Module Attachment 23 USD for 2 x5 for example (to connect all modules of a 6 module kayak)
• Filament ~15-20kg? (will be determined by cad + slicer, currently just a guesstimation)

Internal Links

• Open Source Watercraft Construction Set

External Links

• Wikipedia Pages on Kayaks
• A L.L. Bean Event/Stunt making a HUGE tequila kayak with many "middle sections" - could be a good Practical Publicity Stunt or a fun thing to do at boat parties (ie everyone brings their middle sections, and food etc, connect them all)