Comments by "Lawrence D’Oliveiro" (@lawrencedoliveiro9104) on "" video.

  1. 6:55 No, you mean 3 batteries. You already said each one was made of 31 cells.
    2
  2. 11:15 Not sure what you mean by “pure-electrical”. Do you mean ones using rechargeable batteries?
    1
  3. I thought the key point about a fuel cell is that it uses reactants that are able to release their energy by combustion—i.e. a fuel and an oxidizer. Only instead of burning, they are made to react in a low(er)-temperature chemical process that turns the released energy directly into electricity. Why is this useful? Because internal-combustion engines have a theoretical limit on their efficiency (Carnot cycle) of about 30% or so. Whereas fuel cells can (theoretically) achieve more than 90% energy-conversion efficiency.
    1
  4. 11:53 Mention of methanol I think reinforces my point.
    1
  5. 10:01 Ah, you forgot to say “jemmin-ee” and went “jemmin-eye” instead. Which I think I prefer anyway. ;)
    1
  6. 10:50 You mean ground vehicles? Spacecraft are vehicles, too.
    1
  7. 6:18 Interesting that they used 31 cells in series at a nominal potential of 1V each. I believe the power supply was nominally 28V. Maybe the extra 10% was to cater for quality variation and degradation over time.
    1