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