Hello everybody,

a not-quite-random thought: VE187 has a short paragraph on gunfire
in space. Those rules seem to assume a deep space engagement, with
a low relative velocity between the vessels, at least compared to
the unspecified muzzle velocity.

What happens in orbit, and with muzzle velocities lower than the 
escape velocity?

* Firing a gun means the projectile makes an orbit change, with 
  all the delta-V expended in a fraction of a second. 

* This new orbit might intersect with the surface of the planet,
  and with proper calculations it should be possible to hit a 
  ground target. The impact could come hours or days after firing.

* Alternatively, the new orbit would be stable as well, but it 
  happens to be on a collision course with another orbital object.

Did I get the physics right?

Are there rules in 3E GURPS? What are they? The indirect fire 
rules and the space fire rules appear incompatible, unless I'm 
missing something.

Regards,
Onno
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