Sea Kayak Design SK 101 Presented by Greg Welker
Some Salty Terminology! DECK Day Hatch Bow Cockpit Toggle HULL Keel Stern Hatch Stern
Deck and Grab Lines Deck lines for spare paddle, paddle float Deck lines for pump, water bottle Spare Paddle Deck Lines = bungee Grab Lines = non stretch Grab lines for grabbing your boat
Kayak Dimensions Beam water Waterline Length Overall Length
Speed vs. Maneuverability A long straight keel line increases tracking (go straight) Increasing “ROCKER” increases the maneuverability
Primary Stability Initial Stability A wide kayak is most stable in flat water
Secondary Stability A narrower kayak will handle the waves better.
Bulkheads Internal Bulkheads
Your boat must float! After you have managed to fill it with water! The Right Way Kayak stays level when flooded Cockpit Rim is above water level when paddler is sitting inside
Rear Bulkhead Only Bow floods Cleopatra’s Needle
No Bulkheads The Fix: Float bags Fore and Aft Cockpit flooded!
Float Bag • Tips • Tie them in place • Do not over inflate • Check at the beginning and end of season
Weathercocking Leecocking (Boat turns away from wind) • Steer with rudder • Pull up skeg • Sweep stroke left side Other Causes: • Unbalanced loading • Too much stuff on deck Weathercocking (Boat turns into wind) • Steer with rudder • Put down skeg • Sweep stroke right side WIND
Rudder Pros • Allows more efficient stroke • Low Maintenance Cons • Adds to Cost • Adds drag • No cowboy reentries! Operation • Typically have line to raise or lower • Foot Peg • Slide foot peg forward to adjust • Have to maintain position • Gas Peddle • Adjust with toe movement
Skeg Pros • No clutter on deck • Hard Foot Braces Cons • Jams • Adds Drag • Takes up storage space Operation • Line or slide to adjust depth • Amount of skeg exposed sets correction for current conditions
Skeg and Rudder!
Cockpit Styles Open Easy In and Out Poor Skirt fit – wet Poor paddler fit Keyhole Compromise Ocean Very secure fit Excellent skirt fit Hard to get in and out
Have a seat! • • Keyhole cockpit Legs bent Feet on pedals Thigh braces
Seat and Padding Thigh Braces Seat Hip Pads Back Support (lower than cockpit rim)
What’s That Boat Made Of ? Cost Plastic (Low) Carbon/Kevlar (High) Durability Cloth (Low) Plastic (High) Weight Carbon/Kevlar (Low) Plastic (High) Repairability Thermoform(Low) Wood (High)
Advice to New Boat Buyers “All Boats are Compromises” Corollary: No boat is the “best” at everything Old boats rarely wear out—BUY USED Buy the “BIGGEST” boat you think you’ll ever need. GO TRY OUT A LOT OF BOATS ON THE WATER!
The Right Boat - Creeks, Ponds Short - 12 -14 feet Manuverable Larger cockpit Durable - plastic Floatation – 2 bulkheads
The Right Boat – Rivers, Bay Longer 16 -18 ft Tracking/Speed Seaworthy – Smaller cockpit, Better spray skirt Designed for waves Floatation – bulkheads
Is this the right boat for here? Big water, small boat (12 ft), no spray skirt, no floatation = WRONG BOAT!
Hatches Stern Hatch Day Hatch Bow Hatch
Rubber Hatches Soft plastic Type (Valley Canoe Products/VCP) (Kayak Sport) Pros • Most Waterproof • Replacements widely available. Cons • Can throw spray • Not animal proof • UV degradation
Hard Hatches Hard Plastic or Fibreglass (Current Designs) (Epic) Pros • Animal Proof • Reduced Spray • Larger Capacity Cons • Unique to each boat • Not as waterproof
Questions?
Hull Cross Section Rounded Soft Chine Hard Chine Composite Hull Shapes
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