Please select your home edition
Edition
Cyclops Marine 2020 - LEADERBOARD

Homebuild of new design of Lowrider International Moth

by John Butler 3 Apr 03:14 PDT
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

2020 Australian Sailing Awards
Slingsby and Darmanin reprise top honours Tom Slingsby and Lisa Darmanin have taken out top honours at the 2020 Australian Sailing Awards, with the Olympic-medal winning athletes being crowned Male Sailor of the Year for the 4th time and Female Sailor of the Year for the 3rd time respectively. Posted on 23 Oct
2020 Foiling Week Garda highlights
Physical distancing did not slow down the desire to compete, have fun and learn Sun, wind and sport. But also, science, technology, new experiences and new ways to be together: this is Foiling Week. Posted on 6 Oct
Sailing provides a glimmer of light
September has been a busy month for the sport September has been a busy month for sailing in the UK. A few of the major venues, such as the Weymouth & Portland National Sailing Academy (WPNSA) and Datchet Water Sailing Club, managed to host major events in a Covid-secure fashion. Posted on 28 Sep
Lennon Sails dominate UK Moth Nationals
At last a major Moth event for 2020! It has been a long and difficult year so far as we all know. It has been brightened with a sublime UK Moth event last week hosted beautifully by the WPNSA, IMCA UK and an army of volunteers, held on the Moth paradise of Portland harbour. Posted on 16 Sep
The cream of the crop at Foiling Week Gurit Forum
Moving online and free to watch on Foiling Week social channels Each year at Foiling Week forum everyone marvels at the increasing reach that foiling projects have in the marine industry: from boards to ocean going vessels, from high end racing yachts to more commercial marine applications. Posted on 16 Sep
What happens when a Moth meets an Optimist?
You get a Mothtimist... a must-watch fun video! When a Moth meets an Opti, available for kids trials at Foiling Week 2020. See this video of a fun project by Ferruccio De Asmundis. Posted on 15 Sep
Foiling Week #Sail4Chico at Fraglia Vela Malcesine
The races, the Gurit Forum, the Expo, the flying boats available for trials are all back The regattas, the Gurit Forum, the Expo, the flying boats available for trials in water are all back. This unique 2020 Foiling Week edition is dedicated to Chico Forti, to his family and to all the organizations who are following his incredible case. Posted on 14 Sep
Wetsuit Outlet UK Moth Nationals overall
High flying, high spirits, and high-quality racing A week of highs in Weymouth - high flying, high spirits, and high-quality racing. In a difficult year for so many reasons, the Wetsuit Outlet UK Moth Nationals at the Weymouth & Portland National Sailing Academy has been a highlight. Posted on 12 Sep
Wetsuit Outlet UK Moth Nationals day 4
What's been going on with the boat bimbling? When not on the water, Moth sailors take to boat bimbling. It's easy to see the big changes, such as the deck-sweeping sails, diminishing hull sizes and smaller foils, but there are a host of little changes going on which are less easy to spot. Posted on 10 Sep
Wetsuit Outlet UK Moth Nationals day 3
Fletcher serves up flawless foiling masterclass on Portland Harbour Dylan Fletcher served up a flawless foiling masterclass on Portland Harbour on Wednesday, extending his lead with three perfect results. Posted on 9 Sep
Official-Team-Gear-Red 728x90 BOTTOMDoyle Sails 2020 - Redefining Boundaries 728x90 BOTTOMNorth Sails 2019 - NSVictoryList - Footer