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Sailboat specifications and datasheets

Marlow Hunter 31 shoal draft

The Marlow Hunter 31, here in "shoal draft" version, is a 31’11” monohull sailboat designed by Glenn Henderson. She was built by Marlow Hunter (United States) and made of monolithic fiberglass / vinylester with Kevlar reinforcements. The production started in 2015 .

The Marlow Hunter 31 is as well listed, on Boat-Specs.com, in version Deep draft and Furling mainsail.

Marlow Hunter 31 Marlow Hunter 31 sailplanMarlow Hunter 31 layoutMarlow Hunter 31 sailingMarlow Hunter 31 sailingMarlow Hunter 31 sailingMarlow Hunter 31 sailingMarlow Hunter 31 cockpitMarlow Hunter 31 accommodationsMarlow Hunter 31 accommodationsMarlow Hunter 31 accommodationsMarlow Hunter 31 accommodationsMarlow Hunter 31 accommodations
Marlow Hunter 31's   Main Features
Model Marlow Hunter 31
Version Shoal draft
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Glenn Henderson
Construction Hull:
monolithic fiberglass / vinylester with Kevlar reinforcements
Deck:
sandwich balsa / fiberglass / vinylester
First built hull 2015
Last built hull Still in production
Appendages Keel :
Wing keel
Helm 1 wheel
Rudder 1 spade rudder
Cockpit Open aft cockpit with closing system
Unsinkable No
Trailerable No
EC certification A
Standard public price ex. VAT (indicative only) N/A
Marlow Hunter 31's   Main dimensions
Length overall 32’ 4”
Hull length 31’ 11”
Waterline length 29’ 8”
Beam (width) 11’ 10”
Draft 4’ 5”
Mast height from DWL 46’ 7”
Light displacement 12000 lbs
Ballast weight 3525 lbs
Ballast type Cast iron
Marlow Hunter 31's   Rig and sails
Upwind sail area 581 sq.ft
Rigging type Sloop Marconi (in-mast furling mainsail) fractional
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle Swept-back (Bergström)
IiFore triangle height (from mast foot to fore stay attachment) 35’ 10”
JiFore triangle base (from mast foot to bottom of forestay) 11’ 4”
PiMainsail hoist measurement (from tack to head) 36’ 6”
EiMainsail foot measurement (from tack to clew) 13’ 10”
Marlow Hunter 31's   Performances
Upwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.
The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat.
17.45
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).
The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.
209
Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
29 %
Hull speediAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".
The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.
7.30 knots
Marlow Hunter 31's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 21 HP / 29 HP
Fuel type Diesel
Fuel tank capacity 21.1 gal
Marlow Hunter 31's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 50.2 gal
Water heater capacity 5 gal
Holding tank capacity 19.8 gal
Maximum headroom 6’ 4”

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