I'm having a hard time visualizing the effect of hinge angle on vertical tail deflection.
Consider, for simplicity, a single all-flying vertical tail. Initially, have its hinge axis vertical, along the yaw axis. A leftward (counter-clockwise as viewed from above) deflection of the tail thus causes it to lift to the left, causing the nose of the attached airplane to yaw to the right. There is no pitch coupling here.
We can modify the hinge axis in two ways. We can tilt it, say, to the left (along the angle between the pitch and yaw axes). This is the same hinge line that half a v-tail would use, and is assymetric laterally, so a bit strange. Again, we're only changing the hinge line here; the surface is still strictly vertical when undeflected.
Or, we can tilt the hinge line, say, back (along the angle between the roll and yaw axes). When undeflected, the surface is strictly vertical. When deflected, though, it "tilts back" a bit. This seems intuitively like it would cause a pitch coupling, pushing down on the surface. Is this at all true?
No idea why I'm having such a hard time visualizing these effects... any help (intuitive or equational) appreciated.
Consider, for simplicity, a single all-flying vertical tail. Initially, have its hinge axis vertical, along the yaw axis. A leftward (counter-clockwise as viewed from above) deflection of the tail thus causes it to lift to the left, causing the nose of the attached airplane to yaw to the right. There is no pitch coupling here.
We can modify the hinge axis in two ways. We can tilt it, say, to the left (along the angle between the pitch and yaw axes). This is the same hinge line that half a v-tail would use, and is assymetric laterally, so a bit strange. Again, we're only changing the hinge line here; the surface is still strictly vertical when undeflected.
Or, we can tilt the hinge line, say, back (along the angle between the roll and yaw axes). When undeflected, the surface is strictly vertical. When deflected, though, it "tilts back" a bit. This seems intuitively like it would cause a pitch coupling, pushing down on the surface. Is this at all true?
No idea why I'm having such a hard time visualizing these effects... any help (intuitive or equational) appreciated.
