Catalac 9M Information

Sold as Catalac 9M or Catalac 30

The Catalac 9M was Tom Lack’s first venture into catamaran design. He commissioned John Winterbotham of MG Duff LTD to design the Catalac 9M in 1968, forming part of a range of cruising catamarans which eventually ranged from 8m to 12m. All were built at Lack’s yard in Christchurch. 

Catalac 9M, Catalac 9M info and specs
Catalac 9M

This design was envisioned as the successor to Bill O’Briens venerable Bobcat Catamaran. They would be safe cruisers, aimed squarely at the family marketplace. Thought of as motor sailors because of the boxy design, these boats actually sail very well, don’t heel while sailing and with the 6′ 3 inches of headroom in the hulls, no one feels boxed in or forced to go ‘camping’.

The Catalac 9M was constructed with solid fiberglass, chined hulls with lots of rocker and deep “V” sections forward which flattened out at the stern. The combination of “V” hulls and rocker, eliminated the need of keels while providing what was thought to be enough grip for windward performance.

Catlac 9M
Catlac 9M

Catalac 9M Catamaran sailing

Catalac 9M catamaran under sail. These British built 30 foot boats cross oceans.

The Catalac 9M was a design with a modest rig, high coach roof, large cockpit and 5 berths in four sleeping areas which provided lots of sun bathing deck space, a shallow draft, and had reasonable performance. In a good blow (>20 knots of wind speed) 10 knots at 45 degrees apparent can be expected from the Catalac 9M and in enough wind the boat will tack inside of 45 degrees. In strong quarterly winds speeds of 12-14 knots under sail has been documented with the outboard engine configuration in a lightly loaded boat. Remarkable performance from such a boxy design given that it’s design priority was comfort rather than speed.

The mast is cabin stepped in a tabernacle. These were designed be raised and lowered single handed. The standing rigging is over sized to withstand the extra loading experienced by catamarans (the rig doesn’t unload because the boats don’t heel). 1/4″ 1×19 SS on the Catalac 8M and 9M. They were sold with a mainsail, working jib and a 170% Genoa. When the rig is set up correctly, they sail with a very balanced helm. Twin rudders contribute to their agility and later models (>1980) have matching skegs just forward of the rudders to increase windward ability. 

The Catalac 9M was laid out in two versions. The standard layout had rear locker space for a 30-40hp outboard and the optional layout had aft hull space for two diesel engines. The boats fitted with diesels were well respected for dockside maneuverability as most owners dock with rudders amidship and maneuver the boat with the throttles.

The combination of windage and shallow draught is something to consider as the 9M requires finesse turning into the wind – a trait common to most catamarans as there’s a lot of boat above the waterline and relatively little below, so the Catalac as all catamarans are prone to blowing sideways. Unlike a monohull, there’s no ballast to keep momentum during a tack. Catalacs require the jib be held until it’ about to backwind to turn smoothly through a tack. One has to keep in mind that there are no keels to provide pivot points for the hulls, and it’s important to learn that the turning circle of these boats is greater than one would think. Although sailing is sailing, catamarans sailing requires a bit of learning to sail these boats properly. It’s worth it as the Catalac has excellent cockpit space, tons of room below with easy beaching being the prime benefits. Learning to handle a catamaran is a bit of a learning curve, but once the skills are acquired, these boats bring a smile to all who own them.

The Catalac 9M was in fact a huge success in the marketplace and 255 boats were built over two decades. They hold their value very well, as does the entire line of Catalac boats. There are never more than a few boats for sale world wide at any given time as their owners have a difficult time finding a larger boat with the same level of quality and performance.

Catalac 9M Catamaran

Production started 1970: 255 manufactured;
30 located Americas
Design IntentCoastal Cruiser (some have
made ocean crossings) Perfect weekend or short vacation boat.
Current Price Range USD:$33,000 to $55,000 (see powering options)
Length Overall:29’3″ ft (9 meters)
LWL:25′ 4″
Head Room:6′ 3″ in hulls, 6′ 3″ on bridge
Weight:8,000 lbs dry
Mast height:above water: 39′
Sail Area:(main with two rows of slab reefing; & Jib)
420 sq ft.  (jib is auto Furling)
Power Options:Single outboard: various manufacturers or 2x12hp
RCA-Dolphins gas, or 2  Yanmar 1GM diesels
Fresh Water70 gallons
Fuel24 gallons
Batteries2 Banks
Accommodations:1-double cabin forward starboard hull
1 plan was offered1-single cabin forward port hull
 1-single cabin rear port hull
 1-single berth mid starboard hull
 1-double berth using settee and table
 1-head located rear starboard hull
 Galley located in port hull
Catalac 9M layout

By Rick

Owner of a Catalac 8M and Catamaransite webmaster.

6 replies on “Catalac 9M Information”

This is an easy one. First, be sure you want to sell her. If you really do, list the boat with us here on and she will sell pretty fast, as Catalac 9Ms are in demand. Use this link to go to the boat listing page.

There are 3 parts to all boat advertisements. A boat description where you tell people about your boat. Boat inventory where you tell people what comes with your boat, and the boat photo section where we allow you to upload up to 50 boat photos.

Boat owners fill out this information themselves, the website gives you a login and password so you can leave off and return to it until it’s completed. When you’re finished, we review the advertisement, tweak where necessary, and publish it. – Rick

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