Here are two clips of a shunt with square harry flat bottom hulls.
Windward hull with a little rock and leeward with non. The winds are
from 8 to 12 mph and stronger. Took head sail off of easy rig due to
being over power due to mast flex. The rudders are asymmetrical and
would stall at lower speeds when wind gusts would hit from stright
broad side after a shunt geting cought in irons drifting down wind
side ways . But when moving foward with flow over the rudders they
would hook up, with a slight weather helm needing input from control
stick to keep from heading up. Deffinately not hands off steering.
The boat would fall off the wind better with only rear rudder down
and with head sail on but winds where to strong for rig set up. In
the process of redoing rig and rudder arrangment. Shorter main sail
with same sail area but with a more square top and battens with a
stiffer mast.

Deffinately fast with head sail on a close reach. Surpisingly even
to layperson like my wife. But a bit out of control and over powered.

http://www.youtube.com/watch?v=DaP977ioHao
http://www.youtube.com/watch?v=jkCTjpOosyk&feature=user

Todd