Ok try this, if it still causes problems try using the debug FRED and see if it gives you an error message. That'll be more useful.
#ship classes
;-----------------------------------------------------------------
; Dralthi
$Name: KF-14 Dralthi Mk 5
$Short name: Drakthi
$Species: Shivan
+Type: XSTR("Patrol", -1)
+Maneuverability: XSTR("Good", -1)
+Armor: XSTR("Good", -1)
+Manufacturer: XSTR("", -1)
+Description: XSTR("", -1)
$end_multi_text
+Tech Description: XSTR("", -1)
$end_multi_text
+Length: 25 m
+Gun Mounts: 2
+Missile Banks: 2
$POF file: dralthi5.pof
$Detail distance: (0, 30, 100, 250)
$Show damage: YES
$Density: 1
$Damp: 0.25
$Rotdamp: 0.4
$Max Velocity: 0.0, 0.0, 70.0
$Rotation time: 4.8, 5, 5
$Rear Velocity: 0.0
$Forward accel: 4.3
$Forward decel: 2
$Slide accel: 0.0
$Slide decel: 0.0
$Expl inner rad: 25.0
$Expl outer rad: 55.0
$Expl damage: 15.0
$Expl blast: 1000.0
$Expl Propagates: NO
$Shockwave Speed: 95.0
$Shockwave Model: f_shockwave.pof
$Allowed PBanks: ( "Meson" "Repear" ) ( "Particle" "Neutron" "Ionic Pulse" )
$Allowed Dogfight PBanks: ( "Meson" "Repear" ) ( "Particle" "Neutron" "Ionic Pulse" )
$Default PBanks: ( "Meson" "Neutron" )
$Allowed SBanks: ( "Heat Seeker" "Image Recog" "Dumbfire" "Brute" "FF" )( "Heat Seeker" "Image Recog" "Dumbfire" "Brute" "FF" )
$Allowed Dogfight SBanks: ( "Heat Seeker" "Image Recog" "Dumbfire" "Brute" "FF" )( "Heat Seeker" "Image Recog" "Dumbfire" "Brute" "FF" )
$Default SBanks: ( "Heat Seeker" "FF")
$SBank Capacity: ( 4 4)
$Shields: 1250
$Shield Color: 100 100 255
$Power Output: 5
$Max Oclk Speed: 80.0
$Max Weapon Eng: 80
$Hitpoints: 450
$Flags: ( "player_ship" "fighter" "in tech database" "show ship" "generate icon" "flash")
$AI Class: Captain
$Afterburner: YES
+Aburn Max Vel: 0.0, 0.0, 210.0
+Aburn For accel: 0.7
+Aburn Fuel: 300.0
+Aburn Burn Rate: 60.0
+Aburn Rec Rate: 20.0
$Countermeasures: 30
$Scan time: 2000
$EngineSnd: 128
$Closeup_pos: 0.0, 0.0, -30
$Closeup_zoom: 0.5
$Shield_icon: drath5_shield
$Ship_icon: iconfighter01
$Ship_anim: ssfighter01
$Ship_overhead: loadfighter01
$Score: 8
$Subsystem: communications, 10, 0
$Subsystem: navigation, 10, 0
$Subsystem: weapons, 20, 0
$Subsystem: sensors, 10, 0
$Subsystem: engines, 35, 0
#end