A lot of our models for whatever reason tend to climb & turn left under power, also more power = more up & left. This could be trimmed out at any one speed ---- but then a dead stick will leave U trimmed to go down & right. Thrust line ofset use to
correct this up & left tendency varys the correction with the amount of thrust & leaves a straight ahead trim if U dead stick. A lot easier to deal with when U are already busy.