Am I looking this the wong way?... For a 66" Radar Vapor (or any ski for that matter) there are two stock fin settings below. How can a shorter fin be deeper, and a longer fin be shallower?
Beign the fin a ~semi-circle, as you place it deeper the length will increase as a result.
Long & Shallow:
*Fin Depth: 2.450
*Fin Length: 6.975
Deep & Short
*Fin Depth: 2.510
*Fin Length: 6.840