Open 30

Open 30

Open 30 Cat rig & Canting Keel Version Yacht for Sale in Cape Town

Priced at: R 770 000

Laying in Cape Town Harbour

The Open 30 was designed by Geoff van Gorkom to the ‘box rule’ governing Open classes.

One was built by Moondance Yachts and proved to be a successful racing boat. The Open 30 is a thoroughbred short-handed racing boat and it was felt that a ‘tamer’ version of the boat will respond better with the market need for a comfortable boat with high performance.

The designer, Geoff van Gorkom, was asked to change the rig to a free standing cat type rig with a wishbone and a canting keel. Both these changes would create a boat that is exceptionally easy to sail and be more comfortable and safer as a result but with a performance on par with a fully fledged racing boat. The VPP’s for this configuration showed much promise and Moondance Yachts built this boat.

The Market

Moongazer is an exceptional yacht combining the performance of the Open Class boats with the ease of sailing a simple dinghy like a laser.

She is to be marketed to the owner who wants the least amount of hassle and complications; no crew needed, easy to hoist the main or fly the Code “0”, forgiving by the self tuning main sail and enjoying superb speed and the sensation of performance yachting. The canting keel not only enabled us to make her lighter than the fixed keel version of the Open 30 (saved some 200kg on the lead bulb), but made sailing with a lot of crew for ballast a thing of the past. It is an ideal yacht for the older sailor who wants a lot of fun but without the nuisance.

She is easy to maintain (no woodwork) and the open cockpit is comfortable but sporty. She would make an ideal day sailor or weekender. A trip up the coast to Dassen Island is a joy and she is fitted with a small sink and stove. The interior is open and she can be fitted with a King sized mattress.


Hull and deck

The hull and deck is composite (cedar strip plank and e-glass. All bulkheads are core-cell and epoxy glass. Internal structures such as bunks are marine ply and e-glass. The internal floors and structures for the Canting Keel, dagger board casing and transom are composites (core-cell and e-glass with carbon fibre at high loads areas). All lamination work was vacuum bagged and cured according to best practices and adhering to supplier specifications. The keel area is solid e-glass and additional carbon straps were laminated into high stress areas around the mast collar area. The hull and deck was faired with Awlfair fairing paste and spray painted with Sikkens paints.


The Canting keel is casted ductile iron (SG 50) and the bulb is lead. The canting keel axle is 50mm Nitronic 50 stainless steel with UC400 bearings attached to the transverse bulkheads with 35mm stainless steel machined plates. This simple though robust system is safe and foolproof. The keel is canted by way of two 6:1 block and tackle systems operated from the cockpit. The keel is canted to a maximum of 40 degrees.

The dagger board and twin rudders are foam cored and laminated carbon fibre. The pintle and gudgeon system are machined stainless steel and very strong for peace of mind. The dagger board is manipulated from the cockpit by way of a down/uphaul system running to two Spinlock jammers.

Deck gear

 The rig configuration minimizes the complexity of deck gear considerably. Two 40 ST Harken winches with six Spinlock jammers, eight Wichard padeyes and a range of Harken blocks makes up the sum total of the deck gear. All blocks are attached by way of spectra rope. The choker system for the wishbone consists of a 1:16 purchase system and the main sheet runs through three 75mm blocks to the winches. The central tiller with two self adjusting rods to the aft of the rudders are extended with a Spinlock extension arm. The canting keel is articulated by way of a 1:12 purchase block and tackle system.

The pushpit, pulpit and stanchions are in anodized aluminum with spectra rope as safety lines. Mooring lines are attached to 12mm spectra loops attached to the hull at six points by way of machined vesconite ‘plugs’ bonded into the hull. Thus no cleats on the deck.

Engine and Electronics

Volvo-Penta 10HP saildrive with 40l fuel tank. All fittings EC certified. One 70AH battery with switch panel and internal LED lights. All navigational lights fitted and VHF antenna. Small gas stove and basin unit with 40 l fresh water tank. Toilet fitted. Navigation equipment consist of Tack Tick wireless, a fixed and hand-held VHF and allowance is made for a laptop for navigational purposes.


The geometry of the freestanding carbon mast was designed by Geoff van Gorkom and the engineering on the mast done by Prof. Gerhard Venter from the Department of Engineering, University of Stellenbosch, South Africa.

The mast came out slightly heavier than the designed weight (see below) and with a safety factor of 3.5 is adequate to cope with most extreme conditions. The mast was built in carbon fibre (80% 0/90 and the rest +-45) around a male carbon mandrel. The lay-up was vacuum bagged and cured.

The wishbone is manufactured from 6061-T6 anodized aluminum.

The mainsail is a North 60 sqm fully battened flat top sail (pentex and taffeta) and an 80 sqm screecher launched from a 1.2m bow sprit. The screecher is furled with an Admiral Code “0” continuous line operated from the cockpit. The battcar system is from Tides Marine. The main halyard has a 2:1 purchase for ease of hoisting and two deep reefs with lines running back to the cockpit. A  Cunningham system and two reefing lines are provided. The sail configuration gives the boat a very favourable displacement/length ratio and given the self-tuning characteristic of the rig, high speeds in a broad range of wind conditions.

Cedar strip plank and Ampreg22 Hull, deck and bulkheads
Saertex E-glass and Carbon Fibres
Freestanding carbon mast and boom, spartite sealed.
Awlfair and Sikkens Paint systems, International Micron anti-fouling
Harken Deck Gear, 2 Harken B40′s winches and Spinlock jammers
Halyards and sheets Dyneema Yacht Braid by Southern Ropes
Keel casted in SG50 by Pex Castings
Carbon Rudders (New Van Gorkom Design) with central tiller
Volvo Penta Saildrive.
Gori Folding Propeller
40l Vetus Fuel Tank
Interior as specified by Designer – urethane foam covered (Owners choice)
Pushpit, Pulpit and Stanchions aluminium epoxy treated – spectra safety lines
Lewmar escape and deck hatches
Toilet and wash basin (footpump) and 40l water tank (optional)
Stove and gas bottle Combi with wash basin
All safety gear including a 4 man life raft. Category C
Mooring at RCYC available (additional R 30 000).