I have never checked the actual % of weight supported by the outriggers but unlike sailing trimarans both outriggers are in the water
at all times.(bow down) (necessary)
There is at all times a NEGATIVE angle of attack, ie. the bottom of the boat is flat but tilted forward and the bow is always the deepest part of the boat in the water when underway. (1-1.5 ft, deep)
The wide stern just touches the water.
This does create a degree of bow steering
, which was an initial concern with the prototypes (Five 15 ft prototypes have been built)
This has also been a problem with some of the multhull fast displacement
ferries (from personal experience)
This is where I found that using a Trimaran
configuration was preferable to a mono or catamaran
design plus the addition of a decent rudder
or stern keel
Aft of midway along the hull, under way, if you throw ash (or other floating material) on the water the ash is sucked under the hull.
Initially there is a stern wake but once the boat reaches speed, the stern wave flattens out, and there is little or no wake with little or no interference
with other boats in the vicinity.
Driving straight into the waves (90 degress) is its best point underway, there is little or no lifting to waves (in moderate seas) and no hobby horsing which is very common with fine hulled catamarans.