That speed I recorded was definitely a short burst flying down the front of a wave on a reach - no question of it being sustained. And I have a good idea of when it would've been too. I did feel like the boat had lifted out of the water and was FLYING, the rudder went very light, there wasn't much spray and there was a very big grin and a slight feeling of panic.
Honestly I have no idea!
They're now a 20 year old design, and there are quicker things out there that dont look anywhere near as cool.
The best thing about the magics/lightnings was that you can tow them legally on the road behind a 2 litre medium family car, and be afloat, rigged, and ready to race an hour after arriving at the slipway. The next weekend you can take the family cruising and sleep aboard!