JJ Sinclair wrote:

I own an honest to god, 53:1, 15 meter ship. I'm not kidding, on several
occasions the GPS trace shows I am making 100 foot per statute mile. The only
problem is, when I measure the wings, the tape reads 86 feet (ASH-25)
JJ Sinclair

With a back wind of 75 km/h this is no problem for a 15m ship.

Noël