3 ms·

1370 meters (4,500 feet), apparently. http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.544.7636&rep=rep1&type=pdf http://citeseerx.ist.psu.edu/viewdoc/

• jessriedel 7y ago
  Thanks. The air pressure is about 85% of sea level pressure at that altitude. Maybe that's enough to get some data about how the engine responds, but it's nothing like a real launch, and I think it's borderline fair for Tim Dodd to say these that "none have ever really flown" in the context of orbital rocketry.
  • kevin_thibedeau 7y ago
    The abrupt jump in the altitude plot looks like that sensor was malfunctioning.
  • avmich 7y ago
    I think Tim didn't know about that launch, that's why decided to add to the discussion. Not having data is not the same as not having flown; not only the flight has symbolic value but also, I'm sure, the flight serves as an incentive to all participants, especially students. 1.3 km altitude for a liquid fuel rocket is a very real launch, believe me, for amateur participants.
    • jessriedel 7y ago
      In the context of the video, which focused on technical details, I personally don't think the symbolic or incentive value is relevant. I'm glad you raised the point though.