As in do all kinds of fantastical things on paper but not so much in reality?
Kinda. A lot of development still is needed and many applications were atleast years ago not good enough for the investments. And a good amount of those studys Work with hydrazine which .... well is hydrazine. Also gel fuels need tanks with higher pressures and while many concepts use metal additives those are not easy to handle either. And except for ramjets (or similiar) there not many other applications for military use.
 
The last edition of Sutton's book on rocket propulsion didn't even have gel propellant in it. (The previous did.)
 
The last edition of Sutton's book on rocket propulsion didn't even have gel propellant in it. (The previous did.)
Yeah little investment in IT given that there anything but simple. For example an german rocket concept used an small SRM / gas generator to get the needed pressure to use it.
 
Why is there also reference to 155 mm projectiles in the document?
 

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