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Wooden Boat Plans for Amateur Boatbuilders – Excellent Performance, Simple Construction, Step by Step Instructions Australia, USA, UK, Hungary, S. Sadly my father Malcolm Eggins passed away yesterday in Grafton, he’d been sick for many years and fortunately in the end he went quickly without any suffering. Malcolm and Darryl along with Frank and Mark Bethwaite, the Downes brothers, Vic Hammond, Michael Nash and many, many others were responsible for the development of the NS14 class sailboat in Australia. Many of the innovations that have been passed on to form part of the appearance of modern racing yachts and dinghies were developed through the 1960s and 70s in classes like the NS14.
The NS14 is  a peculiar boat in Australia where restricted classes (where you can alter the hull shape and sail configuration) often have unlimited sail area.
This was very important in the development of my own thinking about boat design, though at that time I was a sailor putting countless drawings onto every piece of paper that passed my way. Malcolm and his son Darryl were on the forefront of many of these developments and were the first to build an NS14 with a self draining cockpit, which was promptly banned. They had big input into hull shape development influencing other designers in the cut and thrust of weekly and national racing. Malcolm also had a long line of building Moth dinghies before they sprouted any wings apart from rudder, centreboard and sails  They were like furniture.
Wood is a main interest of mine and though the Eggins’ moved to composite hulls (built in their shed at home to weights of around 8lbs a foot) the boats were also known for their fine woodwork as you can see from the photos here of the Moth and their last NS14 plus they spent many years innovating in wood.
Malcolm served many years in various positions at the Clarence River Sailing Club – a man who really put the time in to make a big contribution.
The article included excellent take away points about how chines improve form stability for a hull of the same basic dimensions and how accommodation is able to be moved towards the edges of the boat more. However, at the same time the article reflects a lot of the traditional talking points about Chines vs Round Bilge. During the 60s and 70s we, in the antipodes, were fed the line that round bilge hulls were kind of the classic look of speed.


Bob Miller (AKA Ben Lexcen) wiped out all the other conventional singlehanded dinghies with his twin chine Contender dinghy at the IYRU trails to select a new international class, but was told it needed to be round bilged to be acceptable as a high performance boat. Aircraft vortices are large because of the high differential between high pressure under the wing and low pressure over. Both ends of these Chine vs Round Bilge memes are given reinforcement both by the high level people who say them, and by constant repeating in publications and the interwebs.
Witness the last generation of non foiling moths – chines had plenty of presence and mixed it with the boats with radiussed chines. A-class cats have in the last decade become quite interested in boxy shapes, often with very tight radii and flattened bottoms as they understood that a semicircular hull is not necessarily the optimum cross section.
There was always a predominance of chines, even some quite radical sponsons with much less than 90 degree angles on their tips became popular in some design series. But they always seem to come back to chines with occasional flirtations with round bilges despite so much time spent subplaning. But the boats above are all composite and there isn’t so much difference in building time now. Other classes that allow different hullshapes and have a lower speed range – like the Merlin or the National 12 in the UK have always had a mix of round and chine boats. But it seems like chines and edges are no big deal for most reasonable speed regimes and likely have advantages because of much better understood reasons for reducing spray release quantity and keeping spray low – anything thrown up will push the boat down. In the end the lack of evidence of subplaning advantages and disadvantages seems to disprove a lot of what is passed around as if it is understood.
Planing speeds, there are some pretty convincing basic arguments from physics that indicate that chines might be better for at least parts of the boat.
I would of thought that the Hartley TS16 was a perfect example of hard chines, a 16 footer that can out run many larger boats as one can tell by its CBH even though its a none spinnaker class it matches many classes of larger boat with spinnaker. This page is a collection of information that could be useful for International Moth Home Build projects.


The 2004 Chainsaw version is made with three separate ply pieces not the one of the earlier versions.
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YES … that is a photo from 45 years ago- note the rotating timber mast and general lack of fuss in the water around the boat. Malcolm won in a really competitive fleet on pure boatspeed – it was a pleasure to watch. Dead downwind is trim for low drag and compared to spinnakered boats, pretty well head for the mark. The chines near the aft acts as an extension of the sharp bottomed transom when at plane with the rounded sections helping to keep the speed of the water constant.



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