a proa is a polynesian style outrigger boat. with ONE outrigger
that is smaller.
it is assymetric. the smaller outrigger always faces the same
direction as the boat 'shunts' instead of tacks the wind.
(shunting is like going goofey foot on a snow board instead of
carving 180 when you turn)
the main body hull possesses 2 wing sails , rigged at extreme
ends of the hull. they are used for sailing, until they are
needed for flying.
when they are needed for flying they are let down horizontal
and the outrigger mounted aero-propeller then throttles ( it
can throttle while the wind sails up vertical used for sailing to
supplement the boats power, like in motor sailing using the
hydro-prop to supplement the boats wind driven sail inertia)