tom

@tom

active 3 months, 2 weeks ago
  • tom posted a new activity comment 3 months, 2 weeks ago

    Put fields on their roofs?

  • tom posted a new activity comment 3 months, 2 weeks ago

    I think if you integrated the equation for potential energy to increase height above surface with respect to distance, g decreases, you would be surprised by the magnitude of energy required works surprise you, add to that the energy to burn to a velocity to keep orbit stable.

    Fuel is heavy.

    • Most of the energy is in forwards velocity, not height, for a stable orbit. Although the OP didn’t specifically refer to orbits.

      It’s not actually that much energy required. A quick estimate suggests the minimum energy required to put mass into geostationary orbit is about 60 MJ/kg or 16 kWH/kg, or about £2.50 worth of electricity at reta…[Read more]