It’s generally considered that 40’ is the minimum size for a cruising cat, and if full standing headroom is essential that might be a valid argument.

A forty foot cat is a big commitment, especially if you have a busy life style and a desire to indulge in other pursuits. The Grainger 920 concept was spurred on by Martin Vanzulli, lover and savant supreme of most things on two hulls with specifically that sentiment in mind.


Martin had been impressed by our Flying Fish 11 design which he had published on Catsailingnews some years ago, but he wanted to review the concept, in particular with a view to keeping it small and simple. Martin was happy for us to have a free hand in developing the the new concept, but his engagement was highly valuable in extracting the best from the design.

Can we make it smaller, keep it simple, affordable, fast and fun to sail? Martin could see the potential for such a cat on the waters of the Rio de la Plata, where monohulls are numerous but not ideally suited to the shallow and often choppy waters.


Not all owners want to commit themselves to a boat 40’ or even bigger for an occasional cruise, and if you can keep it small you have the opportunity to maximise the power to weight ratio, extract better performance and have a much more engaging sailing experience.

We started with a clean page, developing the shape along the lines of some of our recent high performance day cats. How small can we go and still have a practical cruiser?


Creating a boat in the smaller size range that can deliver on performance, yet also function as a practical cruiser is a challenge, and the challenge gets tougher as the size gets smaller. Well, we love a challenge so we decided to see how small we could go and create an inspired  product.


We started at 9.2m LOA and added a permanent hard top (with or without a pop top or big sliding hatch) and kept the saloon open to the cockpit. 



There was space in each hull for a generous single up forward and bathroom with full standing headroom aft.  Forward in the saloon cabin there was space for a large convertible sofa bed each side. In fact you could sleep two couples in queen sized berths if that was the brief.

A “U” shaped seating arrangement in the cockpit and a compact galley and nav station just inside the cabin rounded out the layout. 


Economical and efficient power is provided by twin outboards. 

Sail controls from the mast lead straight back along the cabin top keeping things simple and light with winches at the ideal height from the cockpit seat.

 Tiller steering combined with daggerboards puts the focus on agility, responsive and all round good fun sailing.

We'll be adding more detail to the Grainger 920 page as the project evolves, including specifications, layouts and possible build options.


We're keen to talk to potential owners, manufacturers, or marine professionals interested in getting involved in the Grainger 920 project and bringing the concept to life.

Interested in keeping in touch with progress on the Grainger 920 Project?

Send us an email and express you interest in buying or becoming involved in the manufacture of the Grainger 920


Tony Grainger


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