pub type FrameSpin = TensorRank2<3, Current, Current, Rate>;
The frame spin $\mathbf{\Omega}=\dot{\mathbf{Q}}\cdot\mathbf{Q}^T$.
\mathbf{\Omega}=\dot{\mathbf{Q}}\cdot\mathbf{Q}^T
pub struct FrameSpin(/* private fields */);