The Tiger Class starship isn't the only Heavy battlescrusier in Starfleet I present to you the Lion Class Heavy Battlescrusier. Part of the family of Cats or felines the Lion Class has a powerful hull design ever seen with two huge nacelles which can go through and to warp inside Iron storms and nebulas.
USS LION NCC-1730-D
LION CLASS HEAVY BATTLECRUSIER
Starship Design © SR71ALPHA / Kevin Sean Morrow