Mecury-Class
Origin : United Federation of Planets
Class and Type: Mecury-Class Heavy Courier
Year Launched: 2370
Structure: 25
Size/ Decks: 5/ 8
Length/ Height/ Beam: 161m/ 43m / 35m
Complement: 80
Atmosphere Capable : yes
Transporters: 2 personal, 2 cargo, 2 emergency
Cargo Units: 50
Shuttlebay: 1 aft
Shuttlecraft: 5 size worth ( 2 Size 1, 1 Size 2 )
Tractor Beams: 1 fv, 1 av
Sensor Systems: Class 2 (+2/C)
Operations Systems: Class 3 (D)
Life Support: Class 3 (D)
Impulse System: Class 7 (.92) (D)
Warp System: Class 7.6 ( 7/8/9.6 ) (E)
TACTICAL
Phaserbanks Type VIII ( x3 )
Penetration 4/4/4/00 (C)
Quantum Torpedoes Mark I ( x2 )
Penetration 5/5/5/5/5 (D)
Shields: Class 4 (C)
Penetration/ Threshold 14/3
Maneuver Mods: -1 C/ +2 H/ +0 T
Traits :
Unique system : warp system
Jury-Rigged Warp system
Note :
Specialized high-warp courier vehicles can be employed for critical missions and are able to cover the 50.3-light-year distance between the station and the UFP inner perimeter within six days. This is equivalent to Warp 9.92, and is accomplished by using alternating twin matter-antimatter reaction cores and nacelle pairs. A modified four-engine version of the Defiant pathfinder spaceframe has proven successful in surpassing the 1,000 light-year/year efficiency barrier.
Star Trek Deep Space Nine ; Technical Manual
nota : this is my first test for ship creation !!!! don't desintegrate me please!
I take the name in "The price of freedom" sourcebook and if you want schematics go : http://neutralzone.future.easyspace....Pathfinder.htm
@+
Kalamaro, le poulpe ingenieur a utopia planitia
P.S. don't hesitate to make critics
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The only comment is that it seems to be fairly heavily armed, but then it could make sense, since a Starfleet courier would probably be carrying cargo that is either vitally needed or extremely valuable. I could also see Starfleet using this ships to transport data which is so classified they can't even risk sending it over encrypted subspace. All in all, a nice design. 
