From: kiranpatela11@gmail.com   
      
   On Friday, 23 August 2019 at 21:22:58 UTC+5:30, trident wrote:   
   > Recently I learned that solid Nuclear thermal rockets need not run on   
   hydrogen with its meek density. They can run on Water or ammonia. Using water   
   as a propellant slashes expected specific impulse by half, from 8 to 4 km/s.   
   But stilll this rocket has    
   greater Isp than most chemical rockets with exception of LOx/Lh2 systems,   
   which also suffer from being robust, like hydrogen NTR.    
   >    
   > My questions is: Why nobody (to my knowledge at least) never explored the   
   possibility of water NTR. I know that DUMBO NTR in rocket's first stage may   
   give you creeps, but the air-beathing NTR with nuclear firs stage was at least   
   theoretically    
   investigated whereas water NTR was not? Why is that?   
      
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