Please select your home edition
Edition
Ovington Boats 2014

Homebuild of new design of Lowrider International Moth

by John Butler 3 Apr 11:14 BST
2020 sees a new design of Lowrider International Moth - stage 1 © John Butler

John Butler has been building a new Lowrider International Moth to his own design over the last six months. Very few Moths have been built without foils during the past ten years!

Some 50 years after buying my first International Moth, a Shelley Mk1, I decided that I needed to join the Lowrider resurgence by designing a Moth suitable for my age (67) and weight.

Back in early 2019 I bought a licence for a piece of software called "3D Boat Design" and started to discover what I could do with it, in order to come up with a hull shape that would carry my 95kg weight.

Bearing in mind that the average Moth sailor is 70kg or less, and I was looking at designing a displacement Lowrider rather than a flying Foiler, creating sufficient buoyancy to take my weight was the main priority without dragging the transom. So the concept of "Ultra Fat B*****d" was born, a reference to both the boat's beam and the girth of my waistline...

As a retired pensioner, my budget would not stretch to use of foam and carbon fibre in its construction, and my understanding of the technology of laminating up a hull or components by a vacuum-bagged method was non-existent, so I went back to basics from decades ago and decided to build it in a developed 3mm plywood shape, using the "Stitch and Glue" method, without a mould, in my garage.

To understand how to create the complex shape from tortured plywood required making a 1/5th scale model in 0.6mm modelling ply from plans extrapolated from the 3D virtual shape.

I started with scarfing together the main ply panels in mid-October 2019, fixing a single length of western red cedar as a gunwhale each side, then using a couple of temporary 15mm ply bulkheads the darts at the rear were pulled together with copper wiring and tack epoxied together.

After joining the bow to midships panels with a second internal triangular piece of ply, laid cross-grain to the hog, the bow was pulled together and the boat shape was formed. Using a method learned from the Miracle dinghy build manual, bulkheads were located in their correct places using a tab and slot method.

The chines were taped with a 50mm Kevlar Aramid tape and epoxy after filleting internally with microballoon filler, prior to the centre spine, daggerboard case and splay mast support bulkheads being fitted.

As of the end of March the decks are all glued down, two coats of epoxy sealer applied, and primed and painted with two-pot polyurethane. Epoxy sealing, filling and fairing of the outside of the hull is now ongoing.

With the design named the way it is, we are left wondering what the boat itself will be christened! Remember we want to hear YOUR stories of boat repairs, renovations and invention too.

Related Articles

Thinnair Moth statement
White Formula take over ownership of the product and tooling Since its inception in 2017 we have been endeavouring to bring the world's best International Moth boat package to the market. We partnered with Dave Hollom and White Formula who both have a long history in high performance boat design and manufacture. Posted on 1 Jul
Shooting the breeze with Tom Slingsby & Tom Burton
Tom Slingsby and Tom Burton talk to Ronstan's Stephen Brayshaw Team Ronstan athletes and Olympic Gold Medal winners Tom Slingsby and Tom Burton talk to Ronstan's Stephen Brayshaw. What does the sailing journey of an Olympic champion look like? Posted on 15 Jun
How to home-build a Moth
James Sainsbury's step-by-step guide! Since building my boats I have had many questions about how I went about certain areas of my builds. Below are the ways that I have built my last two International Moths. Posted on 29 May
The history of the Moth Class live webinar
A very special webinar with a panel of Moth key players North Sails Moth Class Expert Rob Greenhalgh, will moderate a very special Moth webinar with a panel of Moth sailors who have been key players in the evolution of this class. Note the rescheduled date! Posted on 20 May
Development is critical, but must be calculated
Grassroots classes can succeed in a range of different ways When it comes to ongoing development and modification of grassroots classes, each case is different and there are so many factors that must come into account. Posted on 20 May
Mackay Boats bring Olympic prowess to Bieker Moth
New Bieker Moth by Mackay Boats takes two of the top four places overall in the 2019 Worlds High profile Olympic boatbuilder Mackay Boats, have added the Bieker Moth to their line-up that has won 30 Olympic medals and 140 world championships. Here's a look at the Bieker Moth by Mackay Boats that finished second and fourth at the 2019 Worlds. Posted on 5 May
Join North Sails Live - Let's Talk Moths
Rob Greenhalgh is joined by sailor Tom Burton and boat builder Giovanni Galeotti Let's Talk Moths with North Sails is back. North Sails Class expert Rob Greenhalgh is joined by sailor Tom Burton and boat builder Giovanni Galeotti. Posted on 29 Apr
The Greed for Speed
Has it taken away the fun of sailing? With dinghy racing being a competitive sport, there has always been a demand for more power and speed as getting to the finish line faster than the rest is what it is all about, so that in some ways, the 'Greed for Speed' is nothing new. Posted on 24 Apr
Where there's a will there's a way
The past fortnight has proved that sailors are a resourceful bunch If there's one thing that the past fortnight has proved, it's that sailors are a resourceful bunch. The vast majority of the sailing world can't get out on the water, but it certainly doesn't mean we're idle. Posted on 5 Apr
North Sails Cruising Sailors Tool Kit
Also Talk Moths With Tom Slingsby, Upcoming Webinars Our experts have created a variety of articles to help you gain confidence for your next getaway. Let's plan your summer adventure together. Posted on 5 Apr