Originally posted by GKF
I understand that the shuttle speed means the timing but what is it really use for ???
Ad for aperture ... what is it use for ?? For what kind of situations should i use that configuration ??
Here, I found something on shuttle speed for you:
Shuttle Re-entry
The belly of the shuttle is covered with special tiles which dissipate heat. Without this protection, the shuttle would not survive re-entry. At the
shuttle's speed of 8 kilometers per second, the friction caused by collisions with air molecules heat the shuttle about 1430 degrees Celsius.
http://liftoff.msfc.nasa.gov/Academy/SPACE/SolarSystem/Meteors/meteors.html
or maybe you mean this:
Shuttle Speed
The shuttles were traditionally divided into 48, 49, 50, 51, 52 according to the weight of the shuttles. 49 weights 4.9g, 50 means 5.0g, 51 means 5.1g and so on.We found the shuttles using these rating was inaccurate and therefore was difficult to classify. So we change the
shuttles' speed standard. We use Speed 75, 76, 77, 78, 79, 80 instead. There is a 30cm distance between each speed. Shuttle speeds are ideal for different parts of the world. For example, shuttles with Speed 76 are used in China during the summer and 77 during the winter months. We send the shuttles with Speed 75 to Thailand, Speed 76 ,77 to Singapore, Hong Kong and Malaysia, Speed 77, 78 to U.S.A., Speed 78,79 to Finland, Canada, Korea and Japan. Speed 79, 80 to Australia in winter. Speed 73-74 would only be played in high altitude area as Yunnan Province in China and Colorado Springs in U.S.A. ; high temperature area as Johannesburg in South Africa
