Haiko,
Believe it or not, it's on my home spot Lake Geneva, Switzerland...! Unusual nuke conditions for sure, but it's soooo damn'd freaking fun !
The smallest I've found so far : Hot Sail Maui Diva 2.8 m2 : 320 cm luff x 133 cm boom (I don't mind the orange color)
http://www.hotsailsmaui.com/2008/sails.php?sail=diva
Anything with say ±300 cm luff x ±120 cm boom on say a 300-320 cm mast ?
Cheers !
JM