@nyrath

Oh, yes, and #EveryGramCounts as you stated here:

http://www.projectrho.com/public_html/rocket/basicdesign.php#id--Every_Gram_Counts

The question is I haven't seen any #HardSciFi #Roleplaying #Games in which playing characters are created thinking in the the design of the rocket they will pilot (i.e. the rocket equation) leaving aside other physiological and cultural issues.