Re: Galaxy battle question.

From: sjoerd@cs.vu.nl (Sjoerd Schreuder)

Date: Wed, 28 Jun 1995 00:00:00 +0000

dhouston@nynexmc.co.uk (David Houston) writes:

>bartlett@amanda.dorsai.org (Chris Bartlett) wrote:
>>Apologies, my question was poorly phrased.  What I meant to ask was under
>>what conditions in combat does one ship automatically destroy another, i.e
>>what ratio of weapons factor to shield factor?  It says 4/1 in the rules,
>>but does that mean the attack rating = 4*shield rating with or without
>>dilution due to ship size?
>>

>Ship size does not alter the effectiveness of weapons: it only alters the
>effectiveness of the shields.

>Therefore, a ship of mass 30 with a shield of 10 will always be destroyed by
>a weapon of 40 on any ship (provided of course that it fires a "good" shot
>first or has an effective shield at least four times the size of the
>first ship).

>A ship with larger mass and a shield of 10 will have a lower effective
>shield and a ship with a weapon of 40*(30/mass)^3 will always destroy it
>(subject to aforementioned conditions).

>>And, what is the minimum attack rating that can do damage to this same ship?
>>

>The smallest weapon that will damage a ship of mass 30 with a shield of 10 is
>2.5 (ie 10 divided by 4).  Again, the ship size will affect the
>effective shield.

Maybe this little program (in C) will help. I wrote it some years ago,
based on KILLPROB.c by Russell Wallace himself. Excuses for
posting sources here, but it's only a small program. It gives the
values for the 0%/100%/50% weapon-strengths. Note that you have to multiply
by techvalues yourself, everything is in effective strength
(that is: [weapon, shield]-mass * tech)

#include  <stdio.h>
#include  <stdlib.h>
#include  <math.h>

main (int argc,char **argv)
{
  double weapons,shields,size,ShiStr;

if (argc != 3)
  {
    printf (
	"Program to calculate probability of one Galaxy ship killing another\n"
        "by Sjoerd Schreuder 11 November 1992\n"
        "Usage: SAFE shield-strength size\n"
        "This program is in the public domain\n");
    return 1;
  }
  shields = atof (argv[1]);
  size = atof (argv[2]);
  ShiStr = (shields / pow (size,1.0/3.0) * pow (30.0,1.0/3.0));
  printf("safe against %.2lf, No chance against %.2lf, 50/50 against %.2lf\n",
        ShiStr /4, ShiStr * 4, ShiStr);
  return 0;
}

Sjoerd Schreuder

References

Galaxy battle question.
bartlett@amanda.dorsai.org (Chris Bartlett)
Mon, 26 Jun 1995 00:00:00 +0000
Re: Galaxy battle question.
bjornsol@lise.unit.no (Bj|rn Halvor Solberg)
Tue, 27 Jun 1995 00:00:00 +0000
Re: Galaxy battle question.
bartlett@amanda.dorsai.org (Chris Bartlett)
Tue, 27 Jun 1995 00:00:00 +0000