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The Tikopai-class (or Tikopai-subclass), also known as the mk XIB or Constitution mk IV-class, were a sub-type of the Constitution-class heavy cruisers and were ordered for Starfleet appropriation on stardate 5930. Vessels of this type served in the Four Years War, but due to their hull structure, the Tikopai ships were incapable of being refit with newly designed phaser and photon torpedo systems of the 2250s era, although later models included the modern weapons. Forty-four vessels were rated to these specifications in the 23rd century. (TOS references: Star Fleet Technical Manual, The Four Years War)

Although the SFTM describes this class as a later version of the older Constitution design, the FASA RPG manual has these vessels existing earlier, being similar, but not equal to, the other Constitution-class vessels of the era.

Known vessels

Tikopai-subclass (Constitution-class mk IV class I/class XI cruiser/heavy cruiser starships)
Refit to mk IV specifications	Discovery • El Dorado • Endeavour • Forrestal • Hornet • Kent • Kitty Hawk • Langley • Littorio • Radetsky • Richelieu • Saratoga
Built to mk IV specifications	Acrux • Bellatrix • Binar • Capella • Deneb • El Nath • Helios • Regulus • Rigel • Tikopai • Vega
Authorized for construction	Adhara • Agena • Aldebaran • Alioth • Alkaid • Alnilam • Altair • Anak • Antares • Arcturus • Arided • Betelgeuse • Canopus • Castor • Darion • Dubhe • Fomalhaut • Hor • K'hotan • K'ushui • Lux • Miaplacidas • Mirfak • Murzim • Nakarat • Polaris • Pollux • Sardar • Shaula • Spica • Vena • Wezen

Starship classes of the United Federation of Planets
By name	Aakenn • Achernar • Achilles • Advance • Aegian • Aeolus • Aerie • Akira • Akula (destroyer) • Akula (frigate) • Alaska • Ambassador • Andes • Andromeda • Andor • Antares • Anton • Apache • Apollo • Archer • Ariel • Ascendant • Ashanti • Avenger • Babcock • Bader • Baker • Baton Rouge • Bode • Bolarus • Bonaventure • Bonhomme Richard • Bradbury • Brenton • Canada • Canopus • Capella • Centaur • Centaurus • Challenger • Chandley • Charger • Chariot • Chesapeake • Cheyenne • Chimera • Christopher • Cle Dan • Cochise • Cochrane • Constellation • Constitution • Continent • Copernicus • Cygnus • Daedalus • Danube • Decatur • Decker • Defender • Defiant • Deneva • Derf • Dollond • Doppler • Dreadnought • Drexler • Durrett • Eagle • Edward • El Dorado • Enterprise (23rd century) • Enterprise (alternate future) • Epoch • Epsilon • Erewon • Excalibur • Excelsior • Federation • Fenlon • Fermi • Fiji • Freedom • Frontier • Gagarin • Galaxy • Geneva • Genser • Graceful • Grayson • Griffon • Hale • Hardin • Hermes (scout) • Hermes (fast cruiser) • Heston • Hogan • Hokule'a • Horizon • Huron • Icarus • Incursion • Indomitable • Intrepid • Iowa • Istanbul • Iwo Jima • Karekh • Keith • Keppler • Kethkin • Kiev • Kitty Hawk • K'Kmarak • Kolm-An • Korolev • Larson • Lauro • Laweya • Legacy • Lenthal • Lexington • Liberty • Loki • Loknar • London (troop transport) • Luna • Mackenzie • Makin • Mann • Marklin • Marshall • M'Benga • Mediterranean • Merced • Midway • Miranda • Mission • Missouri • Mockingbird • MoKal • Monoceros • Moscow • Nebula • Nelson • New Orleans • Newport • Niagara • Noble • Nomad • Northampton • Norway • Nova • Oberon • Oberth • Odin • Odysseus • Okinawa • Olympic • Oppenheimer • Orion • Osaka • Overfield • Paladin (destroyer) • Paladin (24th century) • Philadelphia • Pinnacle • Piper • Polarity • Pollux • Portsmith • Premonition • Prometheus • Proxima • Ptolemy • Pyrenees • Rakota • Ranger (cruiser) • Ranger (scout) • Reliant • Remora • Renaissance • Rickenbacker • Rigel • Royal Sovereign • Saber • Sagan • Saladin • Samson • Santa Fe • Sawyer • Scorpio • Scylla • Sequoia • Sherman • Shi'Kahr • Sierra • Siva • Solar • Sovereign • Soyuz • Springfield • Steamrunner • Surak • Sydney • Venture • Tangent • Thomas Paine • Thucydides • Thufir • Ticonderoga • Tikopai • Tritium • Typhon • Ukora • Ulysses • Ural • Utah • Vesta • Vigilant (scout) • Vigilant (tactical escort) • Voyager • Wambundu • Wilkerson • Wei-Fa • Wellington • Wells • Yeager • Yorkshire • Zodiac • unnamed
By type	Federation cargo ship • Federation colony ship • Federation construction ship • Federation galaxy ship • Federation mining freighter • Federation repair ship

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STARSHIP CLASS
Tikopai
Type:	heavy cruiser
Armaments:	phaser banks, photon torpedoes
Defenses:	deflector shields

The Tikopai subclass of Constitution-class heavy cruisers were on active duty in Starfleet during the late 23rd and early 24th centuries. (Ships of the Star Fleet, Volume 1)

The first ships of the class were commissioned circa 2281.