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Pastimes : Let's Talk About Our Feelings!!!
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To: Father Terrence who wrote (47227)7/26/1999 2:18:00 PM
From: Jacques Chitte  Read Replies (1) of 108807
 
The NERVA wasn't pulse. It was steady-state; hydrogen pumped through a hot fission core and exhausted as a classic rocket jet. It promised an Isp of maybe 900 sec; compare with a "best chemical Isp " of 450 (mmmmaybe as good as 480) sec for a hydroxygen system.
The advantage of a NERVA was high thrust and high thrust fraction. The downside is of course the need for heavy shielding if manned vehicles are designed.
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