Moth vs Foiling Cats
ETH HyRaii Foiling Cat – Students project
Photo: Thierry Martinez – Moth Worlds 2011 
ETH HyRaii Foiling Cat – 
Whites Dragons Project
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Moths are well advanced in their foiling capabilities to course racing , beachcats are in the development stage. Although the Hydroptere is the fastes sailboat around, and the SYZ project is still on, the idea here is to provide a simpler solution, Moth style, to make foiling cats work for racing.
Fischer is still woking on his flying A-Cat, so we’ll have to wait for a solid and proven solution to even start thinking in challenging the stablished Moths.
The students at ETH made a different approach than Whites Dragons with a single foiling rudder
ETH foiling cat project: hyraii.ethz.ch
ETH flying Video
The number of hulls in a foiler is less important than the number of foils. The Moth (two foils) configuration should be compared with the (one foil) windsurfer configuration and with a three or four foil cat or tri configuration.
I believe (but do not know for sure) that three foils provide far more stability (read max sail area) than two foils.