The Moths are insanely fast once they get onto the foils. This video from the annual Bloody Mary race at my sailing club captures the difference nicely. It's a two hour midwinter handicap race with over 300 boats entered. The Moths start 1.5 hours after the first boats, and in 2013 they won. This year though, it wasn't quite windy enough for them to stay on the foil through all their tacks so they didn't quite catch the leaders. https://www.youtube.com/watch?v=JIpzd5m0xhg