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About Ciro1983811

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    Interstellar Nuclear Engineer

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  • Location Italy
  • Interests Nuclear Physics

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  1. i know, that's how it is written, i suppose 2%wt
  2. that's what you can read on project rho website: Zubrin calculates that the 20% enriched uranium tetrabromide will produce a specific impulse of about 7000 seconds (69,000 m/s exhaust velocity), which is comparable to an ion drive. However, the NSWR is not thrust limited like the ion drive. Since the NSWR vents most of the waste heat out the exhaust nozzle, it can theoretically produce jet power ratings in the thousands of megawatts. Also unlike the ion drive, the engine is relatively lightweight, with no massive power plant required. Zubrin suggests that a layer of pure water be injected into the plenum to form a moving neutron reflector and to protect the plenum walls and exhaust nozzle from the heat. One wonders how much protection this will offer. Zubrin gives a sample NSWR configuration. It uses as fuel/propellant a 2% (by number) uranium bromide aqueous solution. The uranium is enriched to 20% U235. This implies that B2 = 0.6136 cm-2 (the material buckling, equal to vΣf-Σa)/D) and D = 0.2433 cm (diffusion coefficent). Radius of the reaction plenum is set to 3.075 centimeters. this implies that A2 = 0.6117 cm-2 and L2 = 0.0019. Since exponential detonation is desired, k2 = 2L2 = 0.0038 cm-2. Then k = U / 2D = 0.026 cm-1 and U = 0.03. If the velocity of a thermal neutron is 2200 m/s, this implies that the fluid velocity needs to be 66 m/s. This is only about 4.7% the sound speed of room temperature water so it should be easy to spray the fuel into the plenum chamber at this velocity. The total rate of mass flow through the plenum chamber is about 196 kg/s. Complete fission of the U235 would yield about 3.4 x 1012 J/kg. Zubrin assumes a yield of 0.1% (0.2% at the center of the propellant column down to zero at the edge), which would not affect the material buckling during the burn. This gives an energy content of 3.4 x 109 J/kg. Assume a nozzle efficiency of 0.8, and the result is an exhaust velocity of 66,000 m/s or a specific impules of 6,7300 seconds. The total jet power is 427 gigawatts. The thrust is 12.9 meganewtons. The thrust-to-weight ratio will be about 40, which implies an engine mass of about 33 metric tons.
  3. @FreeThinker Also, nertea worked on NSWR .. i don't know if it's in his mods because i don't use them...
  4. You will have also to make a fuelswitch setup for the nuclear fuel tank that allow Ubr4 storage, with a very high dry mass (the pipes bundle of boron carbide) and made it mandatory that the tank have to be directly above the engine (otherwise, no moderator in UBr4 solution means starting a chain fission reaction...kaboom) @FreeThinker, somebody here on forum is trying to develope one, and made some models: Try to contact him!
  5. Yeah that will become really user friendly and give you actually something to do and care about during warp transfers. Miss the right spot and yo'll have to do some sort of jump back and try again, or spend a lot of dV ... that's great! Speaking about something else, i was reading project rho engine list... i think Dr.Zubrin Nuclear Salt water engine should be added as a mid career standalone high trust mid isp long trips engine... The fuel is a 2% solution of 20% enriched Uranium Tetrabromide in water (90% enriched weapon grade uranium could be also used, reducing fuel flow an concentration in water). The fuel tanks are a bundle of pipes coated with a layer of boron carbide neutron damper. The damper prevents a chain reaction. The fuel is injected into a long cylindrical plenum pipe of large diameter, which terminates in a rocket nozzle. Free of the neutron damper when out of the fuel tank, a critical mass of uranium soon develops. The energy release vaporizes the water, and the blast of steam carries the still reacting uranium out the nozzle. Assume a nozzle efficiency of 0.8, and the result is an exhaust velocity of 66,000 m/s or a specific impules of 6,7300 seconds. The total jet power is 427 gigawatts. The thrust is 12.9 meganewtons. The thrust-to-weight ratio will be about 40, which implies an engine mass of about 33 metric tons. For exponetial detonation, kz has to be about 4 at the plenum exit. Since k = 0.062 cm-1, the plenum will have to be 65 cm long. The plenum will be 65 cm long with a 3.075 cm radius, plus an exhaust nozzle. Zubrin then goes on to speculate about a more advanced version of the NSWR, suitable for insterstellar travel. Say that the 2% uranium bromide solution used uranium enriched to 90% U235 instead of only 20%. Assume that the fission yield was 90% instead of 0.1%. And assume a nozzle efficency of 0.9 instead of 0.8. That would result in an exhaust velocity of a whopping 4,725,000 m/s (about 1.575% c, a specific impulse of 482,140 seconds). In a ship with a mass ratio of 10, it would have a delta V of 3.63% c. That's a quasi-interstella engine on fission .... mid tech tree...
  6. mmmh. ... hehehe ... I suggest something like this: Exit speed: readout Exit eccentricity : readout and then if >1 "IPERBOLIC NOT CAPTURED" 0<ecc>1 "ELLIPTIC CAPTURED", =0 "CIRCULAR" <0 suborbital Exit dV to circularize: readout Exit mean anomaly: readout and direction needed to maximize gravity breack effect hdg and pitch (maybe and that would be wonderful, indicating it in blue marker maneuver node targeting on navball!!!)
  7. Yes, but make it of simple understandig, like " mean anomaly and the a statement like: "Exit in prograde orbit, or exit in retrograde orbit... something that people can undertand even without knowing what is the mean anomaly!
  8. Yep!!! That's very easyer to understand when to drop out of warp and how much dV we will need. And also, eccentricity <1 means that you will exit captured in orbit of target (not circular but you will not drift away at least). Good! Please give us an alpha or beta to play with! Nice job!
  9. @FreeThinker should it be possible to add something like dV to capture, or dV to circularize, and eccentiricity readouts @exit from warp? I think that this is more immediate understanding. Bye!
  10. With sufficient solar panels, and with some relays across the system, it's already been done. I remember scott manley interstellar quest video series, he built something with like 100 gigantor xl panels each sat in low kerbol orbit, more than 10 sats generating something like 10 GW each one, beamed in far uv ... and relayed by 4 relay in solar orbit at dres distance. all system covered, at eloo distance it was something like 0,8 - 1GW available to receivers
  11. It's always better to build different specialized ships for different tasks. The warp stage may be useful to travel far away, but for normal tasks it's all added mass and complexity.. Oh, and you may take into account beamed power for intra-solarsystem trips... if you're able to build a good beamed power network system-wide, collecting solar energy in low kerbol orbit and beaming it thru the whole system.
  12. You may try to make a SSTO spaceplane AND a warp stage that you can build once for all, as big as you like, and leave in orbit to dock with, with every speceplane or spaceship you may need. Make the warp stage as powerfull as you can, to be able to handle different weight to warp ratios.
  13. nope! KSPI-Extended engines work also in physicless timewarp, the trick is, as I stated above, to put trottle at 10%, then warp normally, the timewarped applied thrust will be at max throttle
  14. it works, just put your throttle at minimum (below 10% i think) and then start timewarp. During timewarp if you select maximize thrust in the engine action menu, the acceleration and fuel consumption during timewarp will be like you where at full throttle.
  15. Yes... we begin to really need a description review for most part in the game. Also the new plasma mtf reactor use the same description as the thermal one... it's becoming really confusional... many many parts have erroneous description in-game.... generators, reactors, beamed power, radiators ....