We’re all familiar with the questions that arise when looking for a new boat. Is it the right size and does it need work? How does it sail and is it within budget? Next you might look at the specifications – LOA, waterline, beam and draught – and maybe drill down a little deeper on the engine, for example.
The specifications give you a good framework, but more interesting is the information that’s hidden. Or, at least, appears hidden to the everyday boat owner. Aside from a test sail, much of a boat’s performance can be ascertained by looking at some calculations.
Designers use a variety of tools when creating a new boat. Using calculations they can predict things such as stability, seaworthiness and speed potential under a range of conditions. Keel percentage, form stability, VPP and STIX–- these terms may sound off-putting, but get to know them and you’ll better understand your boat
Kasper Wedersøe is a partner and designer at CDE Danish Marine Design. He uses calculations frequently to predict how a boat will behave in the water.
“There are quite a few models that are useful, each in different ways,” he says. “But it’s important to remember that these dimensions are capable of predicting potential – not necessarily the actual performance.”
In other words, the numbers we get from dealers can be a bit optimistic. They’re based on ideal conditions, so not always representative, but can still be useful for comparing boats. Here, Kasper explain some of the more noteworthy terms.
Waterline length
This story is from the January 2021 edition of Practical Boat Owner.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the January 2021 edition of Practical Boat Owner.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
Already a subscriber? Sign In
A sailor's guide to UK sharks and fish
Genevieve Leaper looks at some of the shark species around the British and Irish coasts and how to spot these fish from your boat
Multihull anchoring
Brush up on your multihull sailing skills before heading off on a holiday charter with Gavin Le Sueur's guide to anchoring
A revolution in fabrics
Marine fabrics are using natural fibres, less harmful chemicals and longer-lasting colours. Jake Kavanagh looks at the cut of the cloth
Shoestring voyage of adventure
Richard King and Serafin Colmenares Jr. look back at the remarkable Pacific voyage of Florentino Das in his 24ft home-built boat
A fine day out with a visitor
Six hours afloat and a guided tour to vindicate a fictional sailing heroine's navigational skills
Boats for Baltic cruising
Duncan Kent picks the best sub-40ft sail and power boats for crossing the North Sea and exploring a Baltic summer
Boatyard life
The tide of the year Is rising. Time for work
Weather or not to go sailing
Ignore the apps: it's much safer to swear by the weather wisdom of a local oracle
The angelic East Coast pocket cruiser
It is 100 years since the first Deben Cherub was launched. Julia Jones looks back at the history of this 21ft river racing class
Best anchor types for varied cruising
Rupert Holmes on choosing the best anchor for your boat, your style of cruising, how you’ll use it and your budget