One significant difference between the Blackburn categories and the Sound Rowers is the Cape Ann Rowing club has moved the ratio for High Performance Kayaks slightly higher. The Sound Rowers based their metrics on the fastest readily available sea kayak in about 2004, a Seda Glider. The Cape Ann Rowing club with the increasing number of High Performance Kayaks available felt that moving the metric higher for the Fast Sea Kayak class was appropriate. As such the length to width ration of the top of the FSK class for The sound rowers is 10.99 but it's 11.49 for the Cape Ann Rowing Club. This moves 2 boats on the sound rowers page The JKK U2 and the Twogood Pheonix. Not listed on the Sound Rowers page is the Epic 18x. These 3 boats all move from HPK to FSK. The Necky Arluk I is listed as having an 11.5 ratio. We will need to jig one of these boats to see which side of the 11.5 margin this boat falls. Kayak classes are based on waterline length to width ratio. Those boats with a L:W ratio less than 9.25:1 are in the Sea Kayak class (SK); between 9.25:1 to 11.49:1 are in the Fast Sea Kayak class (FSK); greater than 10.99:1 are in the High Performance Kayak class (HPK). Below is a list of boats by manufacturer with their L:W ratio and respective class.
A table of length to width ratios
| Manufacturer | Model | L:W ratio | Class |
|---|---|---|---|
| Action Fish | Empire Fly | 7.9 | SK |
| AquaDynamic | Thelon 17 | 8.2 | SK |
| Aquaterra | Chinook | 7.9 | SK |
| Aquaterra | Scimitar | 8.4 | SK |
| Aquaterra | Sea Lion | 8.3 | SK |
| Azul Kayaks | Aspen | 8.8 | SK |
| Azul Kayaks | Sultan | 9.4 | FSK |
| Bergans | Ally Folding Sea Touring Kayak | 10.1 | FSK |
| Bear Mountain Boat Ship | Enterprise | 8.3 | SK |
| Boreal Designs | Alvik | 8.3 | SK |
| Boreal Designs | Ellesmere | 9 | SK |
| Boreal Designs | Fjord | 8.3 | SK |
| Boreal Designs | Inukshuk | 8.1 | SK |
| Boreal Designs | Muktuk | 8.2 | SK |
| Boreal Designs | Narwhal | 8.2 | SK |
| Chesapeake Lt. Craft | Chesapeake 16 | 8.6 | SK |
| Chesapeake Lt. Craft | Chesapeake 17 | 8.8 | SK |
| Chesapeake Lt. Craft | Shearwater 17 | 8.8 | SK |
| Cobra | Cobra Expedition | 8.5 | SK |
| Current Designs | Altura | 6.2 | SK |
| Current Designs | Andromeda | 8.3 | SK |
| Current Designs | Breeze | 6.5 | SK |
| Current Designs | Caribou | 8.5 | SK |
| Current Designs | Expedition | 9.7 | FSK |
| Current Designs | Extreme | 9.5 | FSK |
| Current Designs | Freedom | 9.8 | FSK |
| Current Designs | Gulfstream | 8.5 | SK |
| Current Designs | Kestrel 140 | 6.2 | SK |
| Current Designs | Pachena | 6.9 | SK |
| Current Designs | Piceses | 8.6 | SK |
| Current Designs | Raven | 7.3 | SK |
| Current Designs | Slipstream | 8.1 | SK |
| Current Designs | Solstice GT & ST | 8.5 | SK |
| Current Designs | Solstice SS | 9 | SK |
| Current Designs | Speedster | HPK | |
| Current Designs | Squamish | 7.3 | SK |
| Current Designs | Storm | 7.9 | SK |
| Current Designs | Stratus 18 | 9.8 | FSK |
| Current Designs | Vision 130 | 6.5 | SK |
| Current Designs | Vision 140 | 7.0 | SK |
| Current Designs | Vision 150 | 7.3 | SK |
| Current Designs | Whistler | 7.0 | SK |
| Dagger | Baja | 8.4 | SK |
| Dagger | Cortez 16.5 | 8.3 | SK |
| Dagger | Magellen | 8.1 | SK |
| Dagger | Meridian | 7.8 | SK |
| Dagger | Seeker | 8.2 | SK |
| Dagger | Sitka | 9.3 | FSK |
| Destiny | Aquila | <8.5 | SK |
| Destiny | Deception | 8.8 | SK |
| Destiny | Defiance | 8.7 | SK |
| Destiny | Kiska | <8.8 | SK |
| Dirigo | Dirigo | <8.5 | SK |
| Dragonworks | Islander | 8.9 | SK |
| Easy Rider | Dolphin | 7.7 | SK |
| Easy Rider | Eskimo 15 | <8.4 | SK |
| Easy Rider | Eskimo 16 | <8.4 | SK |
| Easy Rider | Eskimo 17 | 8.4 | SK |
| Easy Rider | Eskimo 18.6 | 8.7 | SK |
| Easy Rider | Harpoon 19 | 10.5 | FSK |
| Easy Rider | Sea Hawk | 8.4 | SK |
| Eddyline | Calypso | 9 | SK |
| Eddyline | Falcon (16') | 8.7 | SK |
| Eddyline | Falcon (18') | 9.7 | FSK |
| Eddyline | Fathom | 8.5 | SK |
| Eddyline | Heron | 10.7 | FSK |
| Eddyline | Merlin | <8.0 | SK |
| Eddyline | Nighthawk | 8.5 | SK |
| Eddyline | Orca | 8.2 | SK |
| Eddyline | Raven | 8.3 | SK |
| Eddyline | Sea Star | 9.7 | FSK |
| Eddyline | Skimmer | <7.0 | SK |
| Eddyline | Skylark | 5.3 | SK |
| Eddyline | Wind Dancer | 8.5 | SK |
| Eddyline | Zephyr | 8 | SK |
| Epic | 18x | 11.4 | FSK |
| Epic | 18x Sport | 10.9 | FSK |
| Epic | Touring Cruiser 16 | <8.8 | SK |
| Epic | Touring Endurance 18 | 10.5 | FSK |
| Epic | Recreational GP | 6.1 | SK |
| Epic | V10 | 16.7 | HPK |
| Epic | V10 sport | - | HPK |
| Feathercraft | K1 Expedition | 8.1 | SK |
| Feathercraft | Khatsalano S | 9 | SK |
| Fenn | Mako XT | 13.13 | HPK |
| Folbot Folding K | any as single | <8.0 | SK |
| Folding Craft | 500 EX | 7.5 | SK |
| Futura | Carrera | <13.7 | HPK |
| Futura | Futura | <8.0 | SK |
| Futura | Futura II | <12.3 | HPK |
| Futura | Futura TR | <14.4 | HPK |
| Georgn. Bay Folding Kayak | any as single | SK | |
| Heritage | Expedition LP | 8.4 | SK |
| Heritage | Nomad | 8.2 | SK |
| Hoby Cat | Quest | 5.5 | SK |
| Hody Sport | TK-1 | 10.9 | FSK |
| HopOnTop | HopOnTop | 6.8 | SK |
| Huki | Huki S1-A | HPK | |
| Huki | Huki S1-X | 15.5 | HPK |
| Hurricane Sports | Tampico 140L | 7.1 - (not measured - based on overall length/width) | SK |
| Hutchinson Design | Baidarka Explorer | 8.7 | SK |
| Hutchinson Design | Islander | <9.0 | SK |
| Hutchinson Design | Umnak | <8.4 | SK |
| HydrTufLite | Sea Runner | 8.2 | SK |
| HydrTufLite | Venture | <8.3 | SK |
| Impex Kayak | Currituck | need to measure 17' by 22" | probably SK |
| Impex Kayak | Force Cat 4 | 9.7 | FSK |
| Impex Kayak | Force Category 5 | 9.15 | SK |
| Innova Kayaks | Seaker 1 | 6.3 | SK |
| JKK Kayaks | Supernova | 11.8 | HPK |
| JKK Kayaks | Total Eclipse | 11.8 | HPK |
| JKK Kayaks | U2 | 11.5 need to jig | FSK? |
| Kayak Pro | Jet | 11.03 - need to measure based on guessed 17' waterline and 18.5" beam | FSK |
| Kajak Sport | Artisan Millenium | 8.8 | SK |
| Kajak Sport | Avalon Viviane | 9.9 | FSK |
| Kajak Sport | Infinity Active | 7.3 | SK |
| Kajak Sport | Viking Expedition | 8.4 | SK |
| Kirton Kayaks | Inuk | 10.6 | FSK |
| Kiwi Kayak | any as single | <7.0 | SK |
| Klepper Folding Kayaks | any as single | <7.0 | SK |
| Mad River | Monarch | 7.7 | SK |
| Mariner | Coaster | 7.4 | SK |
| Mariner | Elan | 8.4 | SK |
| Mariner | Escape | 8.9 | SK |
| Mariner | Express | 8.9 | SK |
| Mariner | Mariner | 10.7 | FSK |
| Mariner | Mariner II | 10.2 | FSK |
| Mariner | Mariner XL | 8.8 | SK |
| Mariner | MAX | 8.3 | SK |
| Momentum Yacht Design | Loki R | 9.1 | SK |
| Momentum Yacht Design | Loki Sea Race | 13.6 | HPK |
| Mont Bell | Ellsmere 350 | 8.5 | SK |
| Natural Design | Polaris | 8.6 | SK |
| Nautirad | Greenlander 16 | 7.9 | SK |
| Necky | Alsek | <7.0 | SK |
| Necky | Arluk I | 11.5 need to jig | FSK(?) |
| Necky | Arluk II/1.8/1.9 | 9.9 | FSK |
| Necky | Arluk III | 8.7 | SK |
| Necky | Arluk IV | 7.3 | SK |
| Necky | Chatham 16 | 7.4 | SK |
| Necky | Eliza | 8.1 | SK |
| Necky | Kyook | <7.7 | SK |
| Necky | Looksha II | 10.6 | FSK |
| Necky | Looksha IV | <8.9 | SK |
| Necky | Looksha V | 8.1 | SK |
| Necky | Nootka | 7.7 | SK |
| Necky | Phantom | 13 | HPK |
| Necky | Telsa | <8.5 | SK |
| Necky | Tornak | <8.5 | SK |
| Necky | Elaho | 7.5 | SK |
| Nelo | FW 2000 | 14.5 | HPK |
| Nigel Dennis | Romany Explorer | 8.2 | SK |
| Nimbus | Horizon | <8.7 | SK |
| Nimbus | Lootas | 8.3 | SK |
| Nimbus | Puffin | 8.5 | SK |
| Nimbus | Solander | 8.4 | SK |
| Nimbus | Sprint | 10.3 | FSK |
| Nimbus | Zoom | 9.23 | SK |
| North Shore | Calypso | ?? need to measure 520 cm by 55 cm | Probably SK |
| Novus Composites | NC 15 | <8.0 | SK |
| Novus Composites | NC 17 | 8.3 | SK |
| Novus Composites | NC 19 | 9.1 | SK |
| NW Kayak | Cadence | 8.8 | SK |
| NW Kayaks | Discovery | 8.9 | SK |
| NW Kayak | Esprit | 8.7 | SK |
| NW Kayaks | Pursuit | 8.9 | SK |
| NW Kayak | Sportee | <8.0 | SK |
| NW Kayak | Synergy | 8.3 | SK |
| Ocean Kayak | Manta | 6.1 | SK |
| Ocean Kayak | Pro S1 109 | 4.8 | SK |
| Ocean Kayak | Scupper | 7.5 | SK |
| Ocean Kayak | Scrambler | <7.0 | SK |
| Ocean Kayak | Sprinter | 10.4 | FSK |
| Old Town Canoe | Egret | 7.8 | SK |
| Old Town Canoe | Millenium | 8.8 | SK |
| Old Town Canoe | Nantucket | 6.9 (length/width not measured) | SK |
| P&H | Bahiya | 8.6 | SK |
| P&H | Capella | 7.7 | SK |
| P&H | Iona | <8.5 | SK |
| P&H | Orion | <8.5 | SK |
| P&H | Quest | 8.4 | SK |
| P&H | Sirius | 8.5 | SK |
| Pakboats | Puffin Swift | 6.8 | SK |
| Perception | Avatar 16 | 7.8 | SK |
| Perception | Carolina | 7.9 | SK |
| Perception | Eclipse | 8.6 | SK |
| Perception | Sonoma 13.5 | 6.8 | SK |
| Perception | Vizcaya | 8.1 | SK |
| Prijon | Arctic Tern 14 | 6.8 | SK |
| Prijon | Barracuda | 9.1 | SK |
| Prijon | Cabalara | 6.5 | SK |
| Prijon | Kodiak | 8.5 | SK |
| Prijon | Odysee | 7.8 | SK |
| Prijon | Seayak | 7.6 | SK |
| Prijon | Touryak | 7.3 | SK |
| Prijon | Yukon Eskie | 8.4 | SK |
| Pt. 65º North | K1 R | 8.6 | SK |
| Pt. 65º North | K1 XP | 10.0 | FSK |
| Pt. 65º North | K1 VR | 8.9 | SK |
| Pt. 65º North | KIR | 8.8 | SK |
| Pt. 65º North | X Lite | 8.4 | SK |
| PWS | Avocet | 8.6 | SK |
| PWS | Intrepid | 8.3 | SK |
| PWS | Osprey | 9.4 | FSK |
| PWS | Sea Otter | 7.9 | SK |
| PWS | Seal | 10.8 | FSK |
| PWS | Thunderbird | 7.8 | SK |
| PWS | Widgeon | 7.9 | SK |
| Pygmy | Arctic Tern | 8.3 | SK |
| Pygmy | Arctic Tern 14 | 7 | SK |
| Pygmy | Coho | 8.6 | SK |
| Pygmy | Goldeneye | 8.5 | SK |
| Pyranha | Orca | 6.8 | SK |
| QFC Kayaks | Q300 | <8.8 | SK |
| QFC Kayaks | Q400 | <8.8 | SK |
| QFC Kayaks | Q500x | 8.8 | SK |
| QFC Kayaks | Q600x | 9.7 | FSK |
| QFC Kayaks | Q700x | 10.3 | FSK |
| Rainforest Designs | Kap Farvel | 8.1 | SK |
| Rainforest Designs | Telkwa | 8.3 | SK |
| REI (?) | Marlin (on top) | 7.7 | SK |
| Riot Kayak | Tourlite 15 | 6.8 | SK |
| Seafarer | Solander | 8.6 | SK |
| Seafarer | Sprint | 10.4 | FSK |
| Seavivor Folding Kayak | Greenland Solo | 9.8 | FSK |
| Seaward | Chilco | 9.5 | FSK |
| Seaward | Discover Aurora | 7.7 | SK |
| Seaward | Endeavor | 8.7 | SK |
| Seaward | Navigator | 8.3 | SK |
| Seaward | Quantum | 8.8 | SK |
| Seaward | 2005 Tyee | 8.1 | SK |
| Seaworthy Design | Enetai | 9 | SK |
| Seda | Glider | 10.8 | FSK |
| Seda | Gypsy | 7.5 | SK |
| Seda | Ikkuma 17 | 8.0 | SK |
| Seda | Impulse | 10.4 | FSK |
| Seda | Starlet | 8.2 | SK |
| Seda | Swift | 8.6 | SK |
| Seda | Viking | 8.4 | SK |
| Seward | Chilco | 9.4 | FSK |
| Seward | Quest | 9.4 | FSK |
| Sisson Evolution | >12.0 | HPK | |
| Skim Kayaks | Dex | 9.0 | SK |
| Skim Kayaks | Distance | 9.8 | FSK |
| Southern Exposure | Legend | 9.5 | FSK |
| Southern Exposure | Reiver | 9 | SK |
| Think | Evo | 14.24 | HPK |
| Third Rock Kayak | Espresso | 8.4 | SK |
| TRAK | T-1600 | 9.0 | SK |
| Triton | Ladoga 1 | 7.2 | SK |
| Twogood | Chalupski | 13 | HPK |
| Twogood | Phoenix | 11.3 | FSK |
| Twogood | Mako | HPK | |
| Valhalla | Valhalla | 12.3 | HPK |
| Valhalla | Victory | 13 | HPK |
| Valley Canoe | Aquanaut | 8.8 | SK |
| Valley Canoe | Aquanaut RM | 8.2 | SK |
| Valley Canoe | Avocet | 7.9 | SK |
| Valley Canoe | Nordkapp | 9.4 | FSK |
| Valley Canoe | Nordkapp H20 | 8.7 | SK |
| Valley Canoe | Nordkapp LV | 8.7 | SK |
| Valley Canoe | Petrel | <7.6 | SK |
| Valley Canoe | Pintail | 8.125 | SK |
| Valley Canoe | Selkie | <8.6 | SK |
| Valley Canoe | Skerray | 8.6 | SK |
| Valley Canoe | Skerray XL | 8.9 | SK |
| Valley Sea Kayak | Rapier 18 | 11.1 | HPK |
| Valley Sea Kayak | Rapier 20 | 13.8 | HPK |
| Venturesport | Black Marlin | <13.7 | HPK |
| Venturesport | Eclipse | <13.5 | HPK |
| Venturesport | Elan Crosstrainer | <14.6 | HPK |
| Venturesport | Shearwater | <13.6 | HPK |
| Venturesport | Vector | <12.3 | HPK |
| Venturesport | Venture | 7.6 | SK |
| Venturesport | Vintage | >8.0 | SK |
| Venure Kayak | Ayr 16.5 | 8.5 | SK |
| Waldon | Vision | 6.6 | SK |
| Walden | Vista | <8.0 | SK |
| West Side Boat Shop | EFT | 12.5 | HPK |
| West Side Boat Shop | Marauder | 17.08 | HPK |
| West Side Boat Shop | Thunderbolt T-Rex | 16.54 | HPK |
| Westside Boat | Wave Piercer | 11.6 | HPK |
| Westside Boat | Wave XL/Ultra | 15.7 | HPK |
| Westside Boat | X Par EFT | 14 | HPK |
| Westside Boat | X Par Missile | 18.9 | HPK |
| Wilderness Systems | Alto | <8.7 | SK |
| Wilderness Systems | Arctic Hawk | 9.4 | FSK |
| Wilderness Systems | Epic | 9.7 | FSK |
| Wilderness Systems | Cape Horn 15 | under 8 (472cm by 61cm) | SK |
| Wilderness Systems | Cape Horn 17 | 8.8 | SK |
| Wilderness Systems | Seacret | <8.0 | SK |
| Wilderness Systems | Sealution | 8.1 | SK |
| Wilderness Systems | Sealution SS/II | 8.1 | SK |
| Wilderness Systems | Sealution XL | 8.8 | SK |
| Wilderness Systems | Squall | 9.0 (length/width - not waterline) | SK |
| Wilderness Systems | Tchaika 14 | 7.9 (based on 13'11 by 21.25") | SK |
| Wilderness Systems | Tempest 165 Pro | 8.6 | SK |
| Wilderness Systems | Tempest 17 | 9.38 (eyeballed measurements 16'5" by 21") | FSK |