905e2df1   
   XPost: sci.space.shuttle   
   From: sehix@NOSPAMspeakeasy.netINVALID.retro.com   
      
   In article <58866faa.0401251157.33cafa83@posting.google.com>,   
    zoltanccc@aol.com (Zoltan Szakaly) wrote:   
      
   > > The problem is that Hubble only has, what, 3 of it's   
   > > original 6 gyroscopes still working, and it needs two   
   > > to maintain itself and be usable. The gyroscopes wear   
   > > out, and the next is expected to fail with a couple   
   > > of years. Once it starts tumbling then there's no   
   > > way to do anything with it remotely.   
   > >   
   >   
   > Haven't NASA engineers heard of solid state gyros? Such as RLG-s (ring   
   > laser gyro) or FOG (fiber optic gyro). See:   
   > http://www.kvh.com/FiberOpt/   
   >   
   > These are commercially available and cheap.   
      
   They aren't much use, either, for changing the orientation of the   
   Hubble, since they don't have enough momentum to do the job, being just   
   a little mass-deficient.   
      
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