look at this construction . I think you need to reinforce the mast with steel ropes (forestay, backstay and shrouds) and also maybe the hull it's better to be more wide.
Do you have heel with weight ?"
I did tests with X-Plane , Arduplane 2.7.2 (apm2-hilsensors ver. from 04-May-2013 06:24) and have a problem. When the plane is with heading 90 the GPS vector is pointed 360 degrees. The wind is 0m/s.
Tridge , do you have some…"