Years ago, the X-15 was an experimental aircraft for testing futuristic supersonic and hypersonic space plane concepts such as the space shuttle orbiter.
I used Stallion 3D to do a quick comparison of an X-15 CAD model at two flight Mach numbers,
M=3.5 and M=6.0. The model of the X-15 was taken from NASA OpenVSP hanger. The
results are shown below:
X-15: In the top picture M=3.5. The Mach number is 6.0 in the picture
at the bottom.
The following link has a very interesting article on the X-15 aerodynamics: http://history.nasa.gov/SP-60/ch-5.html. If you are interested in developing airplane concepts, NASA OpenVSP is a good option. More information can be found at http://www.openvsp.org.
The .stl output of OpenVSP can be read directly in Stallion 3D for rapid
aerodynamics analysis (no external grid generation). More information can be
found at http://www.hanleyinnovations.com.
Do not hesitate to email or telephone me at (352) 240-3658 if you have any questions. Thanks for reading.
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