From: nospam@127.0.0.1   
      
   On 1/28/2021 5:22 PM, Snidely wrote:   
   > JF Mezei formulated the question :   
   >   
   >> If landing/takeoff from moon share the same tanks, it will be   
   >> interesting to see the logic that will have to implement some "ethics":   
   >> do you spend whatever fuel that is needed to land safely even if it   
   >> means there isn't enough left to take off back to "gateway" ?   
   >   
   > There's a point where you do a go/no-go check.  I'm pretty sure that you   
   > can find this in the Apollo transcripts (and video/audio where that's   
   > available).  How close that is to landing depends on your ability to   
   > abort a landing; Apollo would have had to abort with the Descent Stage   
   > still attached, because AIUI you couldn't drop the descent stage very   
   > quickly.   
   >   
   I would speculate that for Apollo there were both scenarios. Either full   
   thrust on decent stage to regain orbit for at least part of the journey   
   and perhaps upper stage to finish acceleration to orbit. It would depend   
   on how much fuel you have left in the decent stage. Near the surface I   
   would presume remaining fuel is so low that a jettison and light of   
   ascent engine was in the checklist.   
      
   Where is Henry Spencer when you need him? :-)   
      
   Dave   
      
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