Float Planes are predominantly trimmed in this manner.
With there being a relatively low positioned drag vector due to the parasite drag on the floats and the engine being mounted considerably above, there is a large nose down couple whilst under power, this requiring a large amount of nose up trim to balance the couple. Should the thrust drag couple now be reduced i.e. reducing power, the nose up trim will now have more effect on the aerodynamic forces.
The way around this is to fly inverted but I still haven't mastered the landing this way.
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Stick
