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  1. wolfkeeper

    Solar Sails - may not work

    We know solar sailing works anyway- some satellites use it for attitude control, and the size of the effect is consistent with photonic pressure. Solar particles are a much smaller effect it turns out.
  2. wolfkeeper

    Casting Rocket Engines

    Rocket engines can definitely be constructed with aluminum. There are some big advantages from doing so: a) aluminum has great thermal conductivity (not *quite* as good as copper, but way up there) b) aluminum is very light, 2.7 g/cm^3 c) aluminum is easy to work The downsides are the low...
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