Sailboat Motion Comfort Ratio

Motion Comfort Ratio was developed by Boat Designer Ted Brewer. The formula predicts the speed of the upward and downward motion of the boat as it encounters waves and swells. The faster the motion the more uncomfortable the passengers. Therefore the formula predicts the overall comfort of a boat when it is underway. Higher values denote a more comfortable ride. As the Displacement increases the motion comfort ratio will increase. As the length and beam increases the motion comfort ratio will decrease.
MCR = Disp / (2/3*((7/10 * LWL)+(1/3 *LOA))*Beam4/3 )
Alberg 35 Sloop, Motion Comfort=36.48+
Alberg 37, Motion Comfort=39.3
Allied Mistress 39, Motion Comfort=35.62
Allied Seawind, Motion Comfort=39.69
Allied Seawind II, Motion Comfort=36.89
Alpa A42 (S&S), Motion Comfort=44.85
Alpa A42 (S&S) Half-loaded, Motion Comfort=51.22
Amel Maramu, Motion Comfort=36.05
Amphitrite 43, Motion Comfort=37.67
Amphitrite MS45, Motion Comfort=40.15
Antigua, Motion Comfort=44.99
Baba 35, Motion Comfort=41.94
Bayfield 40, Motion Comfort=35.26
Bolger Ataraxia, Motion Comfort=36.21
Bolger Barnowl, Motion Comfort=37.85
Bolger Leeboard Catboat, Motion Comfort=38.08
Bolger Schuyt Houseboat, Motion Comfort=35.83
Brewer Orca, Motion Comfort=45.23
Brewer Sandingo, Motion Comfort=35.5
Brewer Sunshine, Motion Comfort=46.05
Brewer Thursday's Child, Motion Comfort=44.32
Bristol 35.5, Motion Comfort=35.23
Bristol 40, Motion Comfort=36.57
Bristol 41.1, Motion Comfort=37.85
Bristol 45.5, Motion Comfort=42.97
Bristol Channel Cutter, Motion Comfort=36.89
Brolga 33, Motion Comfort=37.36
Buehler Archimedes, Motion Comfort=52.8
Buehler Dragonfly 50, Motion Comfort=48.88
Buehler Emily, Motion Comfort=37.55
Buehler Juna, Motion Comfort=45.93
Buginese Schooner, Motion Comfort=43.95
CSY 37, Motion Comfort=35.57
CSY 44, Motion Comfort=46.66
CSY 44 Pilothouse Ketch, Motion Comfort=47.94
CT 34, Motion Comfort=37.68
CT 54, Motion Comfort=51.36
CT50, Motion Comfort=50.7
Cabo Rico 37, Motion Comfort=36.61
Cabo Rico 38, Motion Comfort=38.96
Cabo Rico 42, Motion Comfort=36.77
Cabo Rico Tiburon 36, Motion Comfort=39.23
Cal 2-46, Motion Comfort=39.72
Cal 48, Motion Comfort=36.06
Caliber 47LRC, Motion Comfort=38.51
Cambria 44, Motion Comfort=35.56
Camper Nicholson 32, Motion Comfort=43.52
Cape Dory 36, Motion Comfort=35.5
Cape George 31, Motion Comfort=42.16
Cape George 34, Motion Comfort=44.69
Cape George 36, Motion Comfort=47.54
Chatam 330, Motion Comfort=41.76
Cheoy Lee Clipper 36, Motion Comfort=37.41
Cheoy Lee Clipper 42, Motion Comfort=38.59
Cheoy Lee Offshore 31, Motion Comfort=35.45
Cheoy Lee Offshore 50, Motion Comfort=43.51
Cheoy Lee Robb 35 Yawl, Motion Comfort=37.77
Cherubini 44, Motion Comfort=42.05
Cherubini 48, Motion Comfort=41
Chris Craft Sail Yacht 35, Motion Comfort=37.32
Colin Archer 37 Pilot Cutter, Motion Comfort=54.67
Columbia 38, Motion Comfort=35.01
Columbia 40, Motion Comfort=38.29
Columbia 41 Shoal Sloop, Motion Comfort=38.21
Columbia 45, Motion Comfort=40.32
Columbia 45 Sloop, Motion Comfort=35.82
Columbia 50 (Tripp), Motion Comfort=46.64
Columbia 56, Motion Comfort=49.97
Columbia 56 MS, Motion Comfort=49.97
Columbia 57, Motion Comfort=49.77
Colvin Saugeen Witch, Motion Comfort=35.29
Concordia Yawl, Motion Comfort=38.99
Corbin 39, Motion Comfort=42.7
Cornish Crabber Pilot 30, Motion Comfort=35.37
Coronado 35 Ketch (SK), Motion Comfort=36.01
Coronado 35 Sloop (SK), Motion Comfort=36.01
Coronado 41, Motion Comfort=37.95
Creala 40, Motion Comfort=39.34
Crealock 40, Motion Comfort=37.23
Crealock 40 Twin Stay, Motion Comfort=39.34
Dickerson 41, Motion Comfort=37.83
Dix Hout Bay 30, Motion Comfort=37.3
Downeast 45 Ketch, Motion Comfort=45.4
Dreadnought 32, Motion Comfort=47.49
Duncanson 29, Motion Comfort=39.9
Duncanson 40, Motion Comfort=43.71
Endeavor 37, Motion Comfort=38.19
Endeavour 40 Sloop, Motion Comfort=36.59
Endeavour 43 Ketch, Motion Comfort=39.54
Ericson 39, Motion Comfort=35.25
Ericson 41, Motion Comfort=35.57
FISHER 30, Motion Comfort=41.43
Fantasia 35 MK II, Motion Comfort=50.99
Fast Passage 39, Motion Comfort=38.72
Folkes 39 Cutter (Steel), Motion Comfort=41.86
Formosa 46, Motion Comfort=37.8
Formosa 51, Motion Comfort=53.28
Freedom 45, Motion Comfort=35.18
Fuji 32 Ketch, Motion Comfort=35.73
Fuji 35, Motion Comfort=40.74
Fuji Ketch 45, Motion Comfort=43.45
Gail Storm (Exp. Design), Motion Comfort=35.5
Gartside Cutter 30 Ft, Motion Comfort=49.91
Gibbons 42, Motion Comfort=35.57
Gilbert Scarper Flo, Motion Comfort=37.77
Giles 38, Motion Comfort=40.78
Golden Hind 31 MKll, Motion Comfort=39.33
Grampian Classic 31, Motion Comfort=36.13
Gulf 32 Pilothouse, Motion Comfort=39.57
Gulfstar 50ft Ketch, Motion Comfort=38.56
Hallberg Rassy HR39, Motion Comfort=35.7
Hans Christian 38, Motion Comfort=43.52
Hans Christian 41T, Motion Comfort=46.46
Hardin 45 Ketch, Motion Comfort=43.36
Hartley 36, Motion Comfort=48.17
Hartley Fijian 43 Cutter, Motion Comfort=45.16
Heritage 35 By McCurdy & Rhodes, Motion Comfort=37.83
Herreshoff Araminta, Motion Comfort=36.78
Herreshoff Block Island Boat, Motion Comfort=50.35
Herreshoff Bounty, Motion Comfort=46.24
Herreshoff Diddikai, Motion Comfort=47.75
Herreshoff Double-ended Sloop, Motion Comfort=40.29
Herreshoff Joann, Motion Comfort=54.69
Herreshoff Leeboard Ketch, Motion Comfort=41.04
Herreshoff Lifeboat Ketch, Motion Comfort=44.19
Herreshoff Manana, Motion Comfort=49.81
Herreshoff Mobjack, Motion Comfort=50.33
Herreshoff Nereia, Motion Comfort=40.23
Herreshoff Persephone, Motion Comfort=51.95
Herreshoff Restricted Sail Area Cruiser, Motion Comfort=38.13
Herreshoff Santee, Motion Comfort=47.97
Herreshoff Unicorn, Motion Comfort=51.8
Herreshoff Wagon Box, Motion Comfort=42.98
Herreshoff Walrus, Motion Comfort=54.75
Hillyard 9 Ton, Motion Comfort=46.72
Hinckley 38, Motion Comfort=37.9
Hinckley Bermuda 40, Motion Comfort=35.57
Hinckley Pilot 35 Sloop, Motion Comfort=36.58
Hinckley Sou Wester 51, Sloop, Motion Comfort=44.91
Hinckley Sou'wester 42, Yawl, Motion Comfort=36.21
Hood No Compromise 54 (sloop), Motion Comfort=37.1
Hout Bay 30 Gaff Cutter, Motion Comfort=37.97
Hughes Columbia 391, Motion Comfort=38.89
Hustu 70, Motion Comfort=49.29
Hylas 54, Motion Comfort=38.79
Irwin 37 Mk V, Motion Comfort=36.93
Irwin 46 Ketch, Motion Comfort=39.53
Irwin 52, Motion Comfort=47.6
Irwin 65 Ketch, Motion Comfort=46.75
Island Packet 45, Motion Comfort=35.29
Island Packet 485, Motion Comfort=35.6
Island Trader 36, Motion Comfort=35.16
Islander 44, Motion Comfort=39.56
Jason 35, Motion Comfort=35.03
Kelly Peterson 46, Motion Comfort=38.18
Kettenburg PCC, Motion Comfort=39.38
Knutson 35, Motion Comfort=35.74
Landfall 39 (Sino Amer.), Motion Comfort=42.14
Laurent Guiles Vertue, Motion Comfort=46.91
Lecomte Northeast 38, Motion Comfort=36.12
Liberty 49, Motion Comfort=43.07
Little Harbor 44, Motion Comfort=42.43
Lord Nelson 33, Motion Comfort=35.55
Lord Nelson 35, Motion Comfort=35.86
Lyle Hess 32, Motion Comfort=35.26
MacNaughton Passagemaker, Motion Comfort=42.55
Malo 41, Motion Comfort=38.13
Mariner 35, Motion Comfort=42.3
Mariner 39 C-cockpit, Motion Comfort=38.46
Mariner 40, Motion Comfort=47.22
Mariner 47 (Cruising Version), Motion Comfort=45.55
Mariner Ketch 36, Motion Comfort=43.44
Mason 44, Motion Comfort=41.87
Morgan 37OI MKII Sloop, Motion Comfort=36.84
Morgan 45 Ketch, Motion Comfort=35.19
Morgan 462 Sloop (1981), Motion Comfort=35.15
Morgan 462(1979), Motion Comfort=42.04
Morgan 512, Motion Comfort=43.82
Nauticat 331, Motion Comfort=35.36
Nauticat 44, Motion Comfort=43.69
Navy 44, Motion Comfort=39.62
New York 46 (Roberts), Motion Comfort=48.23
Nicholson 31, Motion Comfort=38.72
Nicholson 33, Motion Comfort=36.59
Nicholson 35, Motion Comfort=36.14
Norseman 447, Motion Comfort=35.61
Ohlson 41 Steel, Motion Comfort=43.85
Passoa 47, Motion Comfort=35.54
Passport 47+3, Motion Comfort=37.84
Pearson 385, Motion Comfort=37.22
Pearson 40, Motion Comfort=35.73
Pearson 43 (1968-72), Motion Comfort=46.38
Pearson Invicta Mark II, Motion Comfort=40.08
Peterson 44, Motion Comfort=37.92
Quoddy Pilot, Motion Comfort=38.98
Rafiki 35, Motion Comfort=36.69
Rawson 30, Motion Comfort=40.12
Reliance, Motion Comfort=53.47
Rhodes Bounty II, Motion Comfort=40.8
Rhodes Reliant, Motion Comfort=44.95
Roberts 28 - Steel, Motion Comfort=37.66
Roberts 35 Cutter, Motion Comfort=38.21
Roberts 420 (cat-ketch), Motion Comfort=41.28
Roberts 45 Pilothouse C. C., Motion Comfort=39.65
Roberts 470, Motion Comfort=37.49
Roberts 53 Aluminum, Motion Comfort=35.57
Roberts 53 Steel Ketch, Motion Comfort=40.77
Roberts 55 Cutter, Motion Comfort=48.98
Roberts 58, Motion Comfort=42.83
Rossiter Curlew, Motion Comfort=37.61
Rossiter Pintail (27 F), Motion Comfort=39.97
Rustler 36, Motion Comfort=35.88
Sailmaster 56 MS, Motion Comfort=49.97
Sea Trader, Motion Comfort=35.59
Seafarer 31 Yawl, Motion Comfort=35.09
Seafarer 34, Motion Comfort=37.08
Seafarer 38 Ketch, Motion Comfort=37.27
Shamrock III, Motion Comfort=52.49
Skye 51, Motion Comfort=43.22
Slocum 43 Cutter, Motion Comfort=37.73
South Coast One Design (C&N), Motion Comfort=46.27
Southern Cross 31, Motion Comfort=38.8
Souwester 51, Motion Comfort=43.84
Sovereign 30, Motion Comfort=43.38
Spencer 44, Motion Comfort=39.76
Spencer 53, Motion Comfort=35.31
Spray 38 Centennial (Roberts), Motion Comfort=46.39
Spray 45 Centennial (Roberts), Motion Comfort=47.35
Stellar 53, Motion Comfort=40.71
Stevens Custom 40, Motion Comfort=37.16
Swallowcraft Scylla, Motion Comfort=36.87
Swan 36, Motion Comfort=37.64
Swan 48, Motion Comfort=42.16
Swan 57 CB Sloop, Motion Comfort=39.42
Tahitiana 32, Motion Comfort=49.38
Talbot 48, Motion Comfort=48.61
Tanton 43, Motion Comfort=38.34
Tashiba 36, Motion Comfort=36.28
Tashiba 40, Motion Comfort=41.25
Tayana 37 Cutter, Motion Comfort=40.78
Tayana 48' Deck Saloon, Motion Comfort=35.77
Tayana 52, Motion Comfort=35.57
Tayana 55, Motion Comfort=37.66
Tayana V-42, Motion Comfort=43.33
Tayana V-42 MKII, Motion Comfort=45.35
Tayana Vancouver 460, Motion Comfort=51.33
True North 34, Motion Comfort=45.92
UWB 333, Motion Comfort=41.15
Union Polaris 36, Motion Comfort=40.06
Vagabond 39PH, Motion Comfort=42
Vagabond 42, Motion Comfort=43.43
Vagabond 47, Motion Comfort=48.71
Valiant 50, Motion Comfort=37.95
Van De Stadt 40 (1954), Motion Comfort=38.41
Waterline 50, Motion Comfort=41.14
Watkins 36, Motion Comfort=36.58
Wauqiez Hood 38, Motion Comfort=38.14
Westsail 28, Motion Comfort=41.08
Westsail 32, Motion Comfort=43.61
Westsail 42 Cutter, Motion Comfort=44.6
Westsail 42 Ketch, Motion Comfort=44.6
Willard 8-ton Cutter, Motion Comfort=40.27
Young Sun 35, Motion Comfort=36.09
Young Sun 43 PH, Motion Comfort=43.13
Zinnia, Motion Comfort=48.48