The canted tails minimize the need to use the all-moving tails.
Please explain.
It is generally accepted that having an all-moving canted tail comes with advantages over conventional canted, conventional vertical and all-moving vertical.
They also reduce the size or in some cases remove the need for air brakes.
Not because they are canted. vertical tails can perform this function too if desired.
With digital controls and electro-hydraulic actuators the limited movements of control surfaces has not only become removed, but the computers will distribute the movements to non-traditional surfaces to gain the best expected net result. And the most advanced systems incorporate emergency control movements with damage recognition to remain flight worthy with what should be catastrophic failure. The only way to reach the goal is combining redundancy and broad distribution. Aligning control surfaces with the x, y, and z planes is not as helpful as being at an angle to the plane as alignment reduces – not increases – redundancy.
If you are talking about using conventional canted tails to induce a pitch up or pitch down moment, then they can induce a pitch up moment, but not a pitch down moment. The exact same limitation applies to vertical tails.
If the canted tails are at a YF-23esque angle at ~45 degrees or similar and are all moving then you can generate useful pitch up and pitch down moments.
As for using canted tails to augment roll, vertical tails can perform the exact same function.
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