Sim/flightmodel/weight/m total

From X-Plane SDK

m_total = Total Weight (kgs)

m_total = m_fuel_total + acf_m_empty + m_fixed (payload) + m_jettison + 100

appears that x-plane adds 100 kg (220 lbs) to m_total (possibly a hardcoded weight of pilot)

(added by Jason M)