Moth development - part 2


James Boyd Photography / www.thedailysail.com
We continue our look at where the tincey foilers are heading
This article follows on from part 1 published last week Foils In terms of how the foil shapes have developed, the Mach 2 appears to have a longer vertical component to its foils, but this is in fact an illusion - it is the same length as the Bladerider which in turn was only a few centimetres longer than it was on the Prowler. “The Mach 2 looks very high because you can ride it high and stay stable, whereas if you ride a Bladerider at that height it just feels horrible – wobbly and all over the place,” says designer Andrew McDougall. “The Mach 2 is stiffer and the foils are stiffer - not so much the horizontal foil, but the vertical foil is very solid, so you don’t need a lot in the water to maintain steerage and stability. It is like driving a really nicely tuned sportscar with really soft sticky tyres and you keep driving it faster and faster and it is so good but then you get to this point where everything lets go and then it is all over. It is like that with the Mach 2 - you can ride it high so easily and you can just send it, but then you just hit this one wave which is bigger than the rest and then it doesn’t work.” Obviously you could go higher with the foils, which would increase righting moment and might help reduce susceptibility to waves, but then there are increased drag issues, it would be harder to balance and harder to get foiling. So MacDougall reckons that they could be perhaps 100mm longer but at present can’t see the advantage of this. The Moths for some while have been fitted with vertical foils that are angled slightly forwards as according to Adam

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