So much of the moth class history had gone missing. Few people appreciated the interest there would be in old yearbooks, photos, design drawings and articles. But it seems Mothies are horders and since we posted this page, over 200 photos and scans have been sent in.
This page features yearbooks, brochures, posters etc. And the ‘archive pics’ pages have period photos.
Pleeeze, if you have old moth material in your attic, garage or rabbit hutch, send it to adam for preservation. If you want it back he will scan and return. If you have digital copies or information about the photos, send it straight to me for posting here. Special thanks to Mike Iszatt for cleaning out his closet and saving some great material. teneryfa last minute
1966-67 yearbook A visit from the King of Thailand…
1973 yearbook just check the list of members at the back. Some seriously successful sailors were learning their racecraft in Moths that cost £200 new!
1975 yearbook a big one in three parts two girls on the committee a catamaran design claimed to measure and the beginning of a line that was to change design for ever – the first magnum
1976 yearbook the magnum II makes an entry that was to revolutionise the class and john claridge was clocked at an impressive 14.5 knots!
1978 yearbook if you think narrow hulls are a recent development take a look at chris eyre’s ‘back to the drawing board II’
1979 yearbook moth legend dave iszatt takes his first championship
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1980 yearbook includes a picture of Casper De Graaf’s very narrow design, which was much too heavy. the nationals was a two horse race between the iszatt brothers with mike losing out to david in the final race by one second.
1981 yearbook a great year for mothing with many characters: David Iszatt, John Butler, Colin Evans, Jim Prower, Robin Wood, Chris Cottrill, Peter Conway, Simon Allen, Sean Cox,Roger Angell, John Claridge, and Toby Collyer to name a few.
1982 yearbook Dave iszatt makes it a triple title.
1986 yearbook the year of roger angell (world, national and UK champion) and the magnum v and vi. hulls as light as 45 lbs! a young toby collyer is waiting in the wings.
1988 yearbook someone called Jason Belben came second in the Worlds
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1989 yearbook featuring steve reece, john claridge, mark stead, rob cambell, martin saveker, jason belben, si payne, roger angell, clive everest, toby collyer, melvyn cooper, john pierce, ian ridge and andy patterson: one or two of whom went on to be quite good sailors!
1990 yearbook featuring two pictures of si payne capsizing with hair! the dawning of the modern era with spaceframes narrowing hulls and at least one set of net tramps. featuring magnum 8, axeman, aero II, blitz I, goul 2, gentleman jim designs plus an article on wing masts by clive everest.
1992 yearbook UK nationals: 1st toby colyer magnum 9, 2nd roger angel magnum 10, 3rd jason belben blitz. did the boats or the sailors last longest? the axeman III, blitz mkIII and murf machIII have to be seen to be believed…
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1994 yearbook a classic one this including ‘my first year of mothing’ by junior champ ????(see pic right). plus the skippy mk 1 arrives. yet another milestone design. of even bigger impact was the first T foil rudder explained in john claridge’s article.
1997 yearbook yet more revolution with mark thorpe’s article on his new sleeve luff rig. nick spence wins the worlds for the UK with mark second.
OK it’s time to bring this section up to date. We want to make it a mine of information on Moth and foil design, technology and building. If you are involved in any way and want to publish ideas or experiments, please send them in and I’ll make you a page. Students’ papers are especially welcome and can be posted in pdf format.
Setting up the current foiler designs is something of a dark art. yet a badly set up foiler is like cycling through Rio with two flat tyres wearing a mankini (sorry if that image haunts you). In today’s article the top two sailors in the two leading designs, give us their post Worlds set-up tips…
16-3-08 Foil ventillation
Adam May writes – The front of the foil is the key with the ventilation problem.
To quote Marchaj “The rudder ventilates at certain angles and flow velocities due to the low suction pressure over one of the surfaces (mainly the windward surface). When this pressure is below atmospheric pressure, air can flow down the surface of the foil, causing a dramatic loss of hydrodynamic lift. Ventilation can be control through the use of fences that act as physical barriers to the passage of air.”
The link is a screen grab from a simple cfd program showing the pressure distribution around a typical 0012 section foil at 4 degrees angle of attack. You can see the large suction peak near the nose on the upper surface. On the right, is a photo of a nicely ventilated rudder, but control is retained enough that I could get a camera out and take a photo of it!
I use one fence about 120mm up from the rudder foil wrapping around the front. It doesn’t prevent ventilation but when it happens it enables you to keep control. Fence design is quite well documented when you start looking into it.
Water properties, fwd rake, section shape all influence the behaviour, and there are a number of people pondering ways to prevent it on our rudders! After a weekend of not being able to go downwind without a plume of water behind me I’d certainly like to get to the bottom of it. (Or just wait until it gets warmer!)
21-2-08 Rigging choices
Mike Lennon shared his experience of alternatives to wire rigging on the Yahoo group. Here’s what he posted…
I have used the braided PBO by Gottifredi Maffioli which you splice your self, and the stuff you buy pre made from Easy rigging. The Easy rigging is the lower stretch and lower windage route but not as durable and more expensive.
I broke the plastic cover on two sets on my 14 — one from spin sheet wear and one from spreader wear. Both breakage’s are probably 14 specific and not a problem on the moth. The Gottifredi has been on my I14 for 2 seasons — Same set no problems. It has very robust spectra cover. The easy rigging has a plastic cover which will only take limited abrasion and load — ie if a spreader grips the cover before the stay is tight the cover will snap exposing the fiber which degrades quickly in day light. My latest set from Easy now have Dacron cover. Thicker but durable.
I used 4mm Braided vectran on my forestay ( i14) until i started with the pbo and it held rig tension ok, but it takes more travel in the rig purchase systems to get to load. Once there it worked just fine holding the same static load as wire. I tried 3mm vecrtan on the uppers shrouds but could never get them to load as the system didn’t have enough travel.
I am using 2.5mm Gottifredi PBO on the Moth right now but will switch to the 2mm easy rigging at some point
I never tried Dyneema due to the creep ( elongation without recovery). I believe Marlow have developed some creepless dynemma recently but i have not used it.