shynung

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About shynung

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    Propellant Alchemist

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  1. We know there's a V8 car engine acting as the oxidizer fuel pump, so I presume the idle switch starts up the V8 and rocket igniter, and the full power switch gets the V8 to the redline.
  2. Cockpit of the Bloodhound vehicle. Apparently, much of the driver's view would be the instrument panel; that LCD above the steering wheel is pretty high to look over.
  3. Which is telling. Hybrid rockets aren't really known for high specific impulse. It's barely better than a typical solid rocket booster.
  4. I'm guessing that the rocket's dV budget isn't enough to push the car to 1000 mph, that the rocket runs out of propellant before the speed is reached. The jet engine may be there to ease the dV burden on the rocket, reducing propellant mass requirement.
  5. Jet engine usually come with some sort of alternator, so probably not necessary. However, jet engines are more fuel-hungry than piston engines, and taking electrical power from the jet would reduce thrust it produces. Makes sense to use the alternators on the V8 instead. A monopropellant turbo-generator can also provide auxiliary power without needing the rocket engine being on. Though, again this would be a bespoke design. The V8 is the easier solution to implement. Though, I have a feeling that a Mazda rotary engine would have been more appropriate, due to their high power-to-weight ratio. I guess they chose a Jag engine because the team is based in the UK, and procuring Jag engines may be easier.
  6. True, though that comes with the advantage of a vastly simpler pump that doesn't require another type of fuel (gasoline) to be brought onboard.
  7. It's possible to control the thrust by a throttle valve just before the pump, if using a turbopump.
  8. They could've gone this route, since their oxidizer is HTP (peroxide), which is a viable monopropellant. Why they didn't, I haven't an idea.
  9. Fun fact: a Jaguar supercharged V8 engine is used to power the oxidizer fuel pump for the Bloodhound's hybrid rocket.
  10. Even better, we can put the engines ahead of the crew compartment, and leave the tether extended. This not only puts some distance between the engines and the crew (which can reduce the mass for radiation shielding), but also makes the G vector during thrust and spin identical.
  11. I understand. I simply put forward another method of getting 1G via rotation that's far less mass/resource-intensive, which I think is more appropriate for a ship. For stations, rings are more acceptable, but as you say, we run into the size problem.
  12. Not necessarily. If we can, for example, build a tail-heavy long ship (CoM as near the tail as possible), we can make a ship that's less than 500m long. Still much longer than the ISS, but at least it's a bit simpler to build.
  13. To be fair, no one has built anything like that.
  14. You're talking about a relativistic projectile. These move at considerable fractions of light-speed, and needs large amounts of energy to throw. Nevertheless, going this route, even a small projectile can impart a considerably large kinetic energy.
  15. I agree, that system is not really suitable for a mobile onboard ISRU. Much better for a lunar base. The silver lining on that system is that the process requires lunar regolith instead of water(LH2/LOX), of which the former is much more abundant than the other. I can see an Al/LOX hybrid-rocket-powered lunar SSTO shuttle being feasible with that setup.