From: mikkelhaaheim@gmail.com   
      
   Le mardi 7 juin 2016 02:43:53 UTC+2, eripe a écrit :   
      
   >    
   > Even if you are as dark and cold as an asteroid, can you keep that up for   
   days as you cruise through space?   
      
   You really don't have to. All you have to do is make short term, intermittent   
   burns, during which you dump all the waste heat in the exhaust... yes, this   
   will likely decrease Isp, but it is a tactical trad off.   
      
      
   >    
   > A very directed exhaust might not hit a sensor, but there are still enough   
   atoms in space that a sensitive enough sensor will detect them lighting up   
   under the massive plasma beam.   
      
   There are, on average, approximately 5 atoms or particles per cm^3. Most of   
   these are the high energy product of the solar winds. It is extremely unlikely   
   that anyone would be able to retrieve any useful information from such   
   secondary bombardment.   
      
      
      
   > I was thinking to use a water jet at 10000 bar for a cold drive gas, but it   
   has some weight issues…    
      
   Not necessary. Even if the secondary collisions were to provide some useful   
   information, this can be effectively nullified through the use of intermittent   
   burns.   
      
      
      
   >    
   > To go anywhere you will need to turn your drive on, and then people will   
   know your trajectory, and they will be able to calculate it very precisely, so   
   even if they can’t see you, they will still know where you are.    
      
   This is not so easy as the AR crew would have us believe. All observation is   
   essentially 2D. In order to determine the trajectory, you need 3D information.   
   For example, is that 2km gas cloud travelling laterally to your location? is   
   it at an angle (which    
   means it is considerably longer than 2km)? Is it the entire cloud, or is part   
   of it being obscurred?   
   Next, the detectors that can extract such precision data are extremely narrow   
   field. You need to now exactly where the target is in order to use it.   
   Burnsides 4 hour scan can only provide resolution of 1225 km^2/pixel at 1   
   AU... and that is assuming you    
   actually know the distance. At such low resolution, at such intervals of   
   detection, it will not be possible to maintain a position lock long enough to   
   bring the precision equipment into play.   
      
      
      
      
   >    
   > You would have to separate your craft from a booster section during boost,   
   so you would have a different trajectory than the booster part, but the   
   mission would then have to include a legal objective for the booster.   
      
   Nonsense. You just need to make sure you are not projecting signs of a   
   military manoeuvre.   
      
   --- SoupGate-Win32 v1.05   
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