Does Max Q occur before or after the Prandtl–Meyer expansion fan? The shape, nature's way of avoiding a single shock wave (per Wikipedia) is visible on the Apollo launches for example.

enter image description here Apollo 11, Source

  • 5
    $\begingroup$ I see a distinct lack of photo. Edit in the plain link? $\endgroup$ – Nathan Tuggy Sep 1 '16 at 21:24
  • 2
    $\begingroup$ Given an official photo, it shouldn't be too hard to figure out at what mission GET it was taken, and I'm fairly certain that we know the moment of Max Q with reasonable precision for all Apollo launches. Those two pieces of information would give you your answer... $\endgroup$ – a CVn Sep 1 '16 at 21:35
  • $\begingroup$ Is this is the photo you meant? $\endgroup$ – Abacus Lever Sep 3 '16 at 0:14
  • 1
    $\begingroup$ Some free data for those who want to make an answer: Apollo 11 Launch date: July 16, 1969, 13:32:00 UTC (en.wikipedia.org/wiki/Apollo_11) According to history.nasa.gov/afj/ap11fj/01launch.html, MaxQ happened at 000:01:23 GET Unfortunately, it is not clear when the image was taken exactly - it was probably taken before 2 min and half, but we don't know if it was taken before or after 1:23 (MaxQ). $\endgroup$ – BlueCoder Dec 3 '18 at 9:26
  • 1
    $\begingroup$ The photo description in commons.wikimedia.org/wiki/… (which is the same on the NASA commons flickr account flickr.com/photos/nasacommons/9457415091/in/…) says: (July 16, 1969) The Apollo 11 Saturn V space vehicle climbs toward orbit after liftoff from Pad 39A at 9:32 a.m. EDT on July 16, 1969. In 2 1/2 minutes of powered flight, the S-IC booster lifts the vehicle to an altitude of about 39 miles some 55 miles downrange. $\endgroup$ – BlueCoder Dec 3 '18 at 9:26

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.