PPRuNe Forums - View Single Post - Virgin Galatic Spaceship Two down in the Mojave.
Thread: Virgin Galatic Spaceship Two down in the Mojave.
View Single Post
Old 6th Nov 2014, 12:35
  #217 (permalink)  
WorkingSection
 
Join Date: Dec 2013
Location: Scotland
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Agreed about the maths...
peekay4 agreed:
At 45000ft, the local standard atmosphere temp is 216.5K, speed of sound=295.04m/s, density is 0.2438kg/m^3 so stagnation pressure is 10.6kPa.

At 70000ft, we have T=217.99, a=295.95m/s, TAS=412.9m/s so stagnation pressure is 6.4kPa, and I agree a 40% reduction.
Last edited by WorkingSection; 6th Nov 2014 at 12:41. Reason: dynamic -> stagnation
WorkingSection is offline  
Reply