Date: Wed, 25 Oct 1995 14:49:23 -1600
From: Michael Bailey <pd82495@wapol.gov.au>
Subject: Design & Notes - 700 Mj Laser turret

A quick laser design for a 700 Mj Laser barbette (I chose 700 Mj mainly
because of the optional house rule limiting laser discharge energy to TL x
50...700 Mj is the largest TL 14 laser that can be built.  I've also
included the design notes, for anyone new to FF&S (they don't take up too
much space).

TL-14 700Mj Laser Barbette (X-ray, trainable, grav-focused)

1/ Tech Level:  14

2/ Gravitic focusing present

3/ Focal Array:  4.5m diameter

4/ Discharge energy = 700 Mj
   Input energy = 700 / 0.2 (for grav-focussed lasers)
   Heavy focal array (shipborne laser)
   X-ray laser       (ditto, no requirement for atmospheric use)
   Trainable         (turret / barbette mount)
   SA = 15.91 m^2
   V  = 11.13 m^3
   M  = 11.13 m^3
   P  = MCr 2.227

5/ Performance
   FA diameter = 4.5m = 45dm
   F (focal value) = (5D)^2 = 50625
   R (maximum range) = F/10 * Range factor
                     = 5.062 x 10^9 km (a bloody long way)

6/ Beam Pointer:  300,000km (10 hexes) range
   V = 6m^3
   M = 6t
   P = MCr0.6

   Weapon short range = 10 hexes

7/ Damage:  DV = 2.5*(I^0.5)
   I = DE(1/R^2), where R = laser actual range/base range
   Since range is greater than the laser's base range for all ranges, I = DE
   (if R < 1 then R = 1)

   STF, DV = 2.5*(DE^0.5)
           = 66

   Penetration rating:  IPR = (I^0.5)*0.8
   i.e. IPR = (DE^0.5)*0.8
            = 21
   STF, PR = 1/21

8/ Power source and ROF

   TL-14 Homopolar Generator, 3500 Mj capacity
   V = 140 m^3
   M = 280 t
   P = MCr 1.4

   Power requirements:  ROF  10 = 19.44 MW
                        ROF  50 = 97.22 MW
                        ROF 100 = 194.4 MW

Summary:

TL-14 700 Mj Laser barbette (X-ray, grav focused, trainable)

Volume = 157.13 m^3
Surface area = 15,91 m^2
Mass = 297.13 t
Price = MCr 4.227
Power = 19.44 MW (97.22 MW ROF 50, 194.4 MW ROF 100)

Damage   10:1/21-66 20:1/21-66 40:1/21-66 80:1/21-66

NB:  This weapon does NOT fit into a standard barbette mount.


Michael Bailey (pd82495@wapol.gov.au)