Model number: F91
Code name: Gundam F91
Unit type: prototype general purpose mobile suit
Manufacturer: Strategic Naval Research Institute
Operator: Earth Federation Forces
Rollout: July UC 0116
First deployment: final version deployed March UC 0123
Accommodation: pilot only, in panoramic monitor/linear seat cockpit in torso
Dimensions: head height 15.2 meters
Weight: empty 8.2 metric tons; max gross 21.4 metric tons
Armor materials: gundarium alloy/ceramic composite
Powerplant: Minovsky type ultracompact fusion reactor, output rated at 4750 kW
Propulsion: rocket thrusters: 4 x 15530 kg, 6 x 4380 kg; vernier thrusters/apogee motors: bare mobile suit 64, equipped with VSBRs 69
Performance: maximum thruster acceleration 4.44 G
Equipment and design features: sensors, range unknown; bio-computer system; weapon mount, used to carry beam rifle or beam launcher, located on rear skirt armor plate; heat radiation fins, mounted in shoulders
Fixed armaments: 2 x vulcan gun, fire-linked, mounted in head; 2 x mega machine cannon, fire-linked, mounted in torso; 2 x beam saber, stored in recharge racks in left hip armor, hand-carried in use; 4 x VSBR (Variable Speed Beam Rifle), selectable mega particle acceleration speed for damage or penetration application, mounted on backpack, hand operated/folds over shoulders in use; beam shield, mounted on left forearm; spare beam shield, stored on right hip armor; gatling cannon x 2, mounted on lower set of VSBRs, handheld in use; antiship missile launcher x 4, mounted on lower VSBRs
Optional hand armaments: beam rifle, powered by replaceable e-pac, can be stored on weapon mount; mega beam bazooka, powered by replaceable e-pac, can be stored on weapon mount

Design notes: F-91 Overdrive features an expanded suite of armaments, the largest of which are an additional pair of VSBRs, mounted over the shoulders. Reactor power has been increased accordingly, and the lower VSBRs have been integrated into a pair of combined weapons units equipped with powerful gatling cannons and two antiship launchers.

Additional heat fins have been added to improve cooling, and enough extra thrusters have been mounted to make sure the F-91 isn’t slowed down any by the additional firepower.

Finally, the beam launcher has been replaced with a much more powerful mega beam bazooka.