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About MatterBeam

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  1. Hello guys! This is a general question - I'm not hunting down bugs or reporting errors. The Balloon tanks + SMURFF + Procedural Parts mods allow for extremely lightweight propellant tanks. I'm talking mass ratios of 300+. Are these realistic? Or are these the result of SMURFF acting upon the procedural part masses after RealFuels has already modded their masses? Thanks!
  2. These are incredible! I like the Pegasus's return-booster the most... the under-body wing surfaces are very well done!
  3. I've been inspired to re-start a stock career game, remove all part mods and performance modifications just to participate in this challenge. My entry for STS-1 a/b: Album: I hope to continue the remaining progression challenges.
  4. Holy hell, I went from a calm wonder at the space-station design to gripping panic that reminded me of the early days playing KSP, when my space-planes spun tail-first through the upper atmosphere on re-entry. Applause.
  5. Well, if we set hoop stress to 5.8GPa (Zylon's tensile strength), P the hydrogen pressure, and have r/2t the variable, I can work out some stuff. We want to maximize the pressure but minimize the mass. Overall, we want the maximum mass ratio for the tank. A few excel tables later, I get: Points of interest: -Tank mass ratio is independent of radius and wall thickness, only tensile strength counts -I used 90K temperature, which means liquid oxygen can be kept as coolant. -Ideal gas law gives 2.668kg of hydrogen per pascal per cubic meter at 90K. With A-36 Steel, mass ratio is 0.63 With Zylon, mass ratio is 6.27. With monocristalline silicon, mass ratio is 8.12 With carbon nanotubes, mass ratio is 73. With graphene...... mass ratio is an incredible 150. Thoughts on this method?
  6. Understood. What what about working the other way around: finding the maximum tank pressure a material can hold?
  7. Hi! Super-carbon materials with extreme tensile strengths allows for tanks to withstand very high pressures. Chilled hydrogen gas at high pressures (700 atm) can reach densities equivalent to liquid hydrogen. If we could compress the hydrogen further, could we reach hydrogen densities higher than simple liquid hydrogen? What is the maximum pressure that a tank made out of carbon nanotubes can withstand? So, at a pressure near the limits of the performance of super-carbons, what hydrogen density can we get?
  8. @UnusualAttitude Ooooh that's a smart thruster. It drives an electric current through the propellant by starting with a tiny puff of plasma, and as the electrons are stripped away, the amount of conducting matter increases and increases and with it the current (current is number of electrons moving, so more plasma more electrons...). It's like electrically stripping the atoms of their electrons in the cheapest way possible!
  9. totm

    Is that you? If yes... serious respect.
  10. totm

    @UnusualAttitude A rock band and kids?! That's a dad band. The chicken are silently judging you.
  11. Its hard to say without thrust figures, but I can be sure that: -Water has molecular mass of 18g/mol. Hydrogen has 2g/mol. As you are not using thermal expansion to get your exhaust velocity, hydrogen will not dissociate into 1g/mol mass. So, the ratio of exhaust velocities between the exhaust propellants is (1/2)^0.5/(1/18)^0.5 = 3. Your water exhaust velocity should be at least 3 times lower than with hydrogen. -You might want to look into Wakefield E-beam. Does what you want, but very low efficiency. -Another option is blasting your propellant into plasma then using electromagnetic forces to accelerate it. The upside is that water dissociates into oxygen and hydrogen with lower overall molar mass, the downside is the high running cost in terms of energy. Heating water to 10000K (ionization temperature of hydrogen) loses most of the oxygen. Oxygen at 120000K becomes ionized and you can accelerate it along with the hydrogen... but that's still an impressive 161kJ per gram of oxygen and 209kJ per gram of hydrogen, for an average of 165kJ per gram of water heated to plasma.... -A final option (to use water) is to hydrogenate the molecules by running an electric current through it to produce HO- and H3O+. These are energetically cheap to make... but you'll have a pathetic charge ratio of 1 charge per 16 or 19. Hydrogen ions have a charge ratio of 1, so you'll need electromagnetic field 16 to 19 times stronger to accelerate the water. Alternatively, a tube 16 to 19 times longer. Open to questions
  12. totm

    I have a massive garden, UK weather (without even any snow) and nice soil. However, I've got a student's schedule and thumbs made for keyboards. So I'll just follow this thread with wonder and a faint sense of guilt.
  13. Thanks everyone. Please go support the creator!
  14. I really like the look of the new spaceplane. It seems more... natural? Maybe because it looks less like the Mark IV spaceplane from Nertea. Otherwise, I really like the 'butterfly' rockets with the huge solar wings. It reminds me of the little cards from the High Frontier board game.
  15. Hi! I recently discovered an accurate-to-life hand-drawn animation of the Falcon Reusable booster and the Skylon concept, with explanations of the benefits and challenges spaceplanes face. Enjoy!