zevets

9 ms·

1. 61.▲
   by zevets 13y ago

   Good catch on them showing E vs strain instead of stress/strain. Very misleading, as it clearly got me!
2. 62.▲
   by zevets 13y ago

   Looking at the specs page, their claimed yield stress is 20% higher than aluminum compared to a factor of ~4x for traditional CF composites. Also concerns about the fiber content may be misguided. The hard part of CF compoisites is the the
3. 63.▲
   by zevets 14y ago

   While it's hard to make a data driven argument in this field, I think the US government has been incredibly successful in picking winning new technological ideas, judged by my notion that the vast majority of the scientific and technical ad
4. 64.▲
   by zevets 14y ago

   This notion that people can't pick winners is, in my opinion quite inaccurate. The need for light weight electronics for aerospace systems, and the view that semiconductors were 'the answer' to this problem led to a massive amount of gover
5. 65.▲
   by zevets 14y ago

   It's not that high. A lot of the losses in take-off aren't the consequence of drag. I think I saw on wikipedia that the aerodynamics losses are only 1-200 m/s of the delta-v budget.
6. 66.▲
   by zevets 14y ago

   Judging from the shape of the SpaceX capsule, it seems pretty like it has a limited maximum re-entry velocity, whereas orion is designed pretty explicity for a high speed re-entry. I think when space-x says that dragon is capable of returni
7. 67.▲
   by zevets 14y ago

   Orbital isn't building man rated vehicles.