# Tag Info

The reference point is not the leading edge but the center of gravity (CG), which is a little further back. The ability of a fin to generate a yawing moment is proportional to both its area $A$ and its distance $l$ behind the CG. It is therefore also proportional to their product. This has units of $L^3$ so it is known as the tail volume $V$: $V = A.l$ So ...