are u sure u mean 40knots.
most sailors cannot sail in 30knots.
in 35knots even on 4.0m very feware sailing and less sheeting in.
in 40knots, never saw anyone sail, unless in sheltered water.
i do remember 6/7 years ago, two of australias top 5 slalom sailors got caught out in approx 40/45 knots in the swan river. they both were in water for over 5mins till gust past.
to answer your question.... the green + bluemistral flow of around 10 years ago sailed very high out of water and safe.