• Reference ID 99
  • Builder McConaghy Boats(New builds)
  • Model MC31
  • Engine type Single
  • Material Composite

Yacht description


Following on from the outstanding success of the MC38 One Design, McConaghy Boats brings you the MC31 a High Performance, Grand Prix racer that is true to it’s design brief: fun, fast, and rewarding to sail . Outstanding hull form stability, with a deep draft carbon fin and a heavy bulb combined to provide a low centre of gravity and stability that is unmatched in this size range. The MC38 has demonstrated that with careful design of a powerful hull form and a powerful sail plan, high performance sailing can be exciting in all wind ranges without being taxing on crew and skippers. The MC31 will do the same, it will sail like a much larger yacht upwind in a breeze and light up down wind like a skiff, but be stable enough to stay up right and safe.

The principal behind the MC31 class rules is to provide owners with the thrill of grand prix racing at an affordable price with the guarantee that all owners drive their own boats.

The MC31 features an unprecedented performance driven hull form, and carefully considered systems and deck layout, that enhances the sailing experience, making it ideal for One Design and Club Racing with Offshore Capabilities.

The MC31 was born from a desire to create a boat and class that gave owners and crew the most rewarding time on the water. McConaghy Boats invested  considerable time and effort to ensure that the boat and the class rules delivered on the objectives which other classes had failed to do. McConaghy Boats brings this recipe for success to the MC38’s little brother the MC31

MC31 One Design Spec & Options
Designed and constructed in accordance with the requirements of ISO 12215 Category A as per ISAF Offshore Special Regulations, Section 3.03.1 a)


E glass, foam core, vinylester resin infusion


  • 15 hp Yanmar diesel engine with Sail Drive, 2 Blade Folding Propeller
  • Spinlock flush throttle control
  • Fuel filter and water seperator
  • Waterlock muffler
  • 42 Litre rigid plastic fuel tank


  • 12Volt DC Distribution Panel
  • Start battery, House battery
  • Alternator 80 amp
  • LED Navigation Lights


  • 1Manual bilge pump
  • Optional 4 Auto electric bilge pumps (price for 4)

Deck Hardware + Running Rigging

  • Harken Deck Gear Package
  • 2x Primary Winches - Harken 40.2 PTP (Plain Top Performas)
  • 2 x Runner Winches - Harken 35.2 STP (Self Tailing Performas)
  • 4 x Harken winch handles
  • Optional 4 x McConaghy carbon fibre winch handle pockets
  • Carbon fibre air foil stanchions, pushpits and pulpits
  • Optional carbon life line roller tubes for top life line between pullpit and first stanchion aft pt & stb
  • Optional carbon life line roller tubes for top life line between first and second stanchion pt & stb
  • Stainless Steel 1/19 wire lifelines
  • Fixed bow pole easily removable from socket in bow
  • 4 x Spinlock XTR rope clutches in pit (jib, frac, MH, tackline)
  • Running Rigging Supplied by Sydney Rigging Specialists & Southern Spars: 2 x Jib sheets, 2 x Spinnaker sheets (lead under deck to trimmer), 1 x Tack line lead to stb side of pit (1:1 and 2:1 options as standard)
  • Optional Port tack line with spinlock XTR in pit (removable for O.D.)
  • 2 x Running backstay tails
  • Jib In/Out purchase lead to jib trimmer on both pt & stb side
  • Jib Up/Down purchase lead to jib trimmer on both pt & stb side
  • Jib Cunningham purchase lead to jib trimmer on stb side
  • Spinnaker Take down line lead to cockpit aft
  • Mainsheet coarse tune on swivel cleat in cockpit
  • Mainsheet fine tune purchase lead to main trimmer
  • Traveller purchase lead to main trimmer
  • Main Cunningham purchase lead aft to main trimmer
  • Main Outhaul purchase lead aft to main trimmer
  • Vang purchase lead aft behind traveller
  • Carbon fibre tiller with spinlock tiller extension
  • Carbon fiber helmsman and main trimmer foot bars
  • Optional Carbon fiber guest foot bars aft of main traveller PT & STB
  • 4 x Inspection ports on cockpit sides for rope tails
  • McConaghy custom sliding forward hatch with pneumatic seal. Rounded edges of front hatch for smooth spinnaker hoists and drops. Hatch seal pump located in cockpit.
  • Optional cut out in front hatch to allow hatch to close with sheets attached to spinnaker
  • Optional spare front hatch lid for offshore use if cut out option above is selected
  • Optional 12v compresor for forward hatch seal


  • Carbon fibre keel fin
  • Lead Bulb
  • Retractable for motoring in shallow water & transport
  • Optional keel block to raise keel by 300mm for reduced draft sailing (removable for O.D.)
  • Optional removable crane for keel retracting
  • Optional Weed cutter for keel fin


  • Carbon fibre rudder stock
  • Self aligning Jeffa bearings

Rig + Rigging - Supplied Exclusively by Southern Spars

  • Carbon fibre Mast, Two sets of swept back carbon spreaders
  • Split two piece mast with reuseable join for ease of road transport
  • Internal Hydraulic Mast Jack easily adjustable when sailing
  • Optional Easily adjustable mast step with screw for prebend tuning & hinging mast base to allow rig to be lowered aft
  • Main halyard lock
  • Jib halyard (Vectran) with XTR rope clutch
  • 1 x Mast head spinnaker halyard
  • Optional 2nd Mast head spinnaker halyard with XTR rope clutch (removable for O.D.)
  • 1 x Fractional halyard
  • Optional bullet lock for fractional halyard (removable for O.D)
  • Optional genoa staysail halyard with XTR rope clutch (removable for O.D.)
  • Adjustable Forestay with lashing
  • Carbon Fibre Boom includes 2 reef lines with in built XTR rope clutches and outhaul purchase
  • Hinging mast base for easy stepping and lowering of mast. (Mast hinges aft through
  • Optional 1706 Tuff Luff for headstay
  • Optional Variable thickness shim stack for hydraulically adjustable mast step (light medium heavy)
  • Optional mast lowering poles and car assembly


  • 2 x setee seats with lifting lids in saloon area
  • 2 x setee seat cushions - black with red piping
  • Light weight "porta potti" head
  • Removable ice box cooler under companionway step
  • Optional 2 x LED strip lights in saloon area hard wired to switch board


  • Hull: White gelcoat
  • Deck: light grey gelcoat with non skid finish
  • Optional stick on non-skid in cockpit area
  • Optional soft foam in cockpit area
  • Cockpit sides: black gelcoat
  • Optional single colour (non metallic) paint finish to topsides and transom
  • Optional Custom graphics or metalic paint finishes
  • Below waterline including keel and rudder finished with white gelcoat
  • Optional Antifoul below waterline including rudder and keel
  • Below deck: White flow coat from bow to companionway bulkhead, aft of companionway peel ply racing finish

Additional Options for up to Cat 2 Racing

  • Magnetic compass supplied and installed *****
  • Emergency Tiller*****
  • Padeyes for cockpit jackstays / clipping Points****
  • VHF Radio, supplied and installed**** (cable and aerial in mast to be installed during commissioning process with mast and not included)
  • Suitable Galley facility: small sink bucket ****
  • 2 x Aluminium framed pipe cots aft of companionway****
  • SRS Load rated loops for side deck soft padeyes required for jackstays***
  • Stove - single gimballed***
  • 2 x 50L Freshwater Bladders with hand pump**
  • Life raft Padeyes (Set of 4)**
  • Additional manual bilge pump operable from below deck**
  • Offshore fixed composite spray dodger for companionway hatch

*****Options required for Cat 5 Racing
****Options required for Cat 4 Racing
***Options required for Cat 3 racing
** Options required for Cat 2 Racing

Instrument Options
Owners to buy and have installed locally - is best for support and warranty.

  • B&G H5000 MC31 OD instrument pack
  • B&G Triton MC31 OD instrument pack
  • Optional install of owner supplied B&G thru hulls for depth and speed if owner supplying and installing instruments

Packaging Options

  • Dock Box
  • Plywood support frame for shipping boat on an angle within a 40ft open top container includes shrink wrap
  • Simple Shipping cradle for transporting boat in low position Ex Factory including shrink wrap
  • Galvanised steel cradle for double stacked shipping and trucking includes packing and shrink wrap (boat must be shipped as one of a pair)
  • Galvanised Hardstand Up/Down cradle for transporting boat in low position Ex Factory including shrink wrap
  • Set of splashes for mounting on own cradle

Disclaimer and notes

1. Please refer to McConaghy Standard Sales Contract for full terms and conditions
2. Prices are Ex Factory China unless otherwise stated, duties, taxes, packaging and shipping are not included
3. Renderings, drawings and images may not reflect final specification detail, some items may not come as standard, please refer to Sales Contract for more detail
4. Pricing and Specifications may change without prior notice
5. This document is not contractually binding, McConaghy Boats reserve the right to withdraw this document, and or to review and update this document at our absolute discretion.
6. © McConaghy Boats - This document must not be reproduced, copied, loaned or disposed of directly or indirectly, nor used for any purpose other than that for which it is specifically furnished without the prior written consent of McConaghy Boats.



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