Battleship Submarine Game: Full Version Software' title='Battleship Submarine Game: Full Version Software' />Just days before the USS John S. McCain was involved in the U. S. Navys latest collisionatsea, the Navy released a report on the June accident involving the USS. RAD Game Tools web page. RAD makes Bink Video, the Miles Sound System, the Telemetry Performance Visualization System, Oodle Data Compression, and Granny 3D a 3D. The term military simulation can cover a wide spectrum of activities, ranging from fullscale fieldexercises, to abstract computerized models that can proceed with. PX9MOfG-noM7gelhM1p5rXkg0jn1chb8pQiaeZdN0htHc1iHTkE22bvKhav70AwLaibl=h900' alt='Battleship Submarine Game: Full Version Software' title='Battleship Submarine Game: Full Version Software' />Realistic Designs A M Atomic Rockets. GCNR Spacecraft. Propulsion. NTR GASopen. Fueluranium 2. Propellanthydrogen. Specific Impulse. Exhaust Velocity. Mass Flow. 0. 8 to 6. Thrust. 20,0. 00 to. Battleship Submarine Game: Full Version Software' title='Battleship Submarine Game: Full Version Software' />The emails reflect a common refrain among engineers who develop autonomous technologythat software, not hardware, is where companies can gain an advantage over. These are some spacecraft designs that are based on reality. So they appear quite outlandish and undramatic looking. In the next page will appear designs that are. NFixed Thrust. 22. NThrust Power. 0. GWInitial Accel. 0. GCNR Spacecraft. Mars Courier. Mission. Duration. Wet Mass. 95. 0,0. Dry Mass. 29. 0,0. Mass Ratio. 3. 2. Thrust. 15. 0,0. 00 NInitial Accel. Specific Impulse. Exhaust Velocity. V6. 4,1. 00 ms. H 2. U Ratio. 20. 0 1. U Fuel. 3,3. 00 kg. Hydrogen. Propellant. Data from Gas Core Rocket Reactors A New Look. This little hot rod can do a round trip mission to Mars in 8. Thats only 2. 7 months. Using Hohmann trajectories a round trip Mars mission will take 3. Mars Terra launch window to open. The report starts off with the common complaint that most rocket propulsion is either high thrust low specific impulse or vice versa. The problem being that rocket designers want a high thrust high specific impulse engine. In other words they want a torchship. The closest thing they can find that is actually feasible is a Gas Core Nuclear Thermal Rocket. Open cycle of course, closed cycle has only half the exhaust velocity. So what if it spews still fissioning uranium in an exhaust plume of glowing radioactive death The report examines the GCNTRs performance to see if it is a torch drive. It comes pretty close, actually. The higher the specific impulse exhaust velocity, the more waste heat the engine is going to deal with. They figure that a GCNTR can control waste heat with standard garden variety regenerative cooling like any chemical rocket, but only up to a maximum of 3,0. Past that you are forced to install a dedicated heat radiator to prevent the engine from vaporizing. Otherwise the engine vaporizes, your spacecraft has no engine, and perhaps centuries from now your ship will come close enough so that space archaeologists can recover your mummified remains. As everybody knows, thermal rockets use a heat source to heat the propellant usually hydrogen so that its frantic jetting through the exhaust nozzle creates thrust. Solid core nuclear thermal rockets NTR use solid nuclear reactors. They are limited to a specific impulse Isp of about 8. K. Any higher specific impulse raises the temperature high enough that the reactor starts to melt. And nobody likes an impromptu impression of the China Syndrome. If you want an Isp of 5,0. K Also as everyone knows the gas core NTR concept is the result of clever engineers thinking outside of the box and asking the question what if the reactor was already vaporized Instead of solid nuclear fuel elements it uses a super hot ball of uranium vapor which is dense enough and surrounded with enough moderator neutron reflector that it still undergoes nuclear fission. The fission produces huges amounts of thermal radiation, which heats the hydrogen propellant. The fissioning uranium is like a nuclear sun in the center of the engine. Torrent De La Casa De Mickey Mouse. The reaction chamber directs a flow of propellant around the sun to be heated. Since this is using the concentrated energy of fission there is no real limit to the thermal energy generated think nuclear weapons. Unfortunately there is a limit to the hydrogen propellants ability to absorb heat. Any heat that the hydrogen fails to sop up will hit the engine walls. If this unabsorbed heat is more than the heat radiator can cope with, bye bye engine. This puts the upper limit on the engines Isp capability. Engine. Cavity Linergraphite 5 niobium. Moderatorberyllium oxide. Propellant. Presure. Nm. 2Propellant. Seeding. Moderator. Thickness. Cavity Liner. Thickness. Engine Cavity. Diameter. Uranium. Plasma Dia. Uranium. Plasma Vol. Uranium. Plasma. Critical Mass. Engine Massincluding 2. U4. 0,0. 00 to. 21. The engine is spherical. The outer layer is the pressure vessel since both the propellant and uranium gas needs lots of pressure to make this thing work, a layer of beryllium oxide Be. O moderator a neutron reflector to help the uranium undergo nuclear fission, and an inner porous slotted cavity liner that injects the cold propellant to be heated. In the center is the furious blue hot atomic vortex of uranium plasma. Sadly, this structure does suffer from waste heat 1 a bit under 0. Which is a problem but not a major one. Most of the thermal radiation is soaked up and removed by the propellant. A whopping 7 of the reactor power hits all three layers of the engine, because part of the fission output is in the form of gamma rays and neutrons, instead of useful thermal radiation. Hydrogen propellant does not do zippity doo dah to soak up gammas and neutrons, all of it sails right through the propellant to hit the engine structure. Deep inside the engine structure, gamma rays and neutrons are more penetrating than x rays. This waste heat is managed by the engine heat radiator and a bit managed by regenerative cooling, about as effectively as a 3 year old helping Daddy wash the car. Most of the engine is the beryllium oxide moderator. It is designed to operate at 1,4. K, which is below the 1,7. K melting point of the Be. O but above the 1,1. K radiator temperature otherwise the radiator will refuse to remove the heat. The hydrogen propellant is pumped into the engine at about 5. As it turns out hydrogen propellant is transparent, which means it is lousy at absorbing thermal radiation. Thats not good. To remedy this sad state of affairs, it is seeded by adding tiny metal bits about the size of particles of smoke, about 5 to 1. This is done right before the propellant exits the porous cavity liner into the flood of heat from the nuclear vortex. The seeding absorbs all the thermal radiation and passes the heat to the propellant by conduction. The seeding material will be something like graphite, tungsten, or non fissionable uranium 2. Around the exhaust nozzle the seeding concentration will have to be increased to 2. The cold 2. 0 seeded hydrogen will reduce the specific impulse a bit but it has to be done. The porous cavity liner in some as yet to be defined manner magically sets up flow patterns so that the propellant flows around the hot uranium and exits via the exhaust nozzle. Meanwhile miraculously the uranium is trapped in a stagnant cavity in the center so hideously radioactive fissioning uranium does not escape through said exhaust nozzle. Uranium escape not only exposes the crew to deadly radiation, it is also a criminal waste of uranium that is, it lets get away uranium that is not contributing to the engines thrust. The interior of the engine cavity diameter is 2. This gives a fuel to cavity radius ratio of 0. The idea is for the uranium sphere to be 4. However since hydrogen propellant is going to diffuse into the atomic vortex, the uranium sphere might be up to 5. This means the effective volume of pure uranium will be closer to 2. The uranium can be injected by pushing a very thin rod of solid uranium into the chamber. The uranium penetrates the Be. O moderator inside a tunnel lined with a cadmium oxide neutron poison, because otherwise there would be a nuclear explosion once the uranium was surrounded by Be. O. This is a bad thing. The engine was designed to have the nuclear reaction happen in the core of the chamber, not in the walls. As the uranium rod enters the chamber, the heat of the fission ball vaporizes the rod so the fresh uranium atoms can join the party. A problem is how to get the process started.