http://apcnasa3ozl2j74htizuzba5b6nhugbg2qze2nrz43siunkct555fpid.onion
A "TAXONOMY" OF ADVANCED PROPULSION CONCEPTS PROPULSIVE Chemical Solids Conventional Hybrid Solid/Liquid "Regular" (Solid fuel, liquid oxidizer) "Reverse" (Solid oxidizer, liquid fuel) Liquids Mono-propellant vs Bi-propellant vs tri-propellant Pressure-Fed vs Pump-Fed Conventional vs Micro-Size (SDIO/BMDO "Brilliant Pebbles" et al.) Propellant Type Earth-Storable (Room Temp.) - N 2 H 4 , HAN (Army LP), NTO/MMH, NTO/N 2 H 4 ["Dual-Mode"] Space-Storable (Cryogenic) "Soft" Cryogens (>~100 K)...