1
$\begingroup$

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

$\endgroup$
  • 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 agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.