Fergy

Hi I hope this helps The herc is measured in three way 1 is the water line but also uses bl (buttock line) and fuselage station FL The BL is actually the width of the a/c from the center of the plane. So starting from the middle of the a/c you go left or right. For example the wheel well bulkheads start on both side are at BL61.25\"L and 61.25\"R so maybe using the BL will give you the diameter of the fuse. I am also pretty sure WL 200 in not the exact center, it is the flight deck floor WL and the top of the wheel wells I would have to look in the book I hope this helps a little