Jiggz decribed it well. But as hydraulic systems are not intuitively obvious to everyone, I'll say it in a different way. The hydraulic pump pushes fluid under pressure to both the trim and tilt cylinders at the same time. The tilt cylinder is smaller in diameter but taller. The smaller diameter means it pushes with less force, but it also moves farther when a given amount of fluid is pumped into it. This is what you want when you are raising the engine while sitting still. ... The trim cylinder has to have a larger diameter so the same amount of fluid pressure will generate enough force to hold in engine in its trimmed position while underway with the propeller trying to push the bottom of the engine forward. As it doesn't have to move the engine through as large a range of motion as the tilt, the trim cylinder is shorter. ... So, as Jiggz said, when there is no significant force resisting either, the tilt cylinder will move more quickly than the trim.
