21. Stalls occur not only at slow airspeed but can occur at any speed-but only if the wings exceed their critical angle of attack. 22. The critical angle depends on the relative difference in index of refraction, larger differences will increase the critical angle and trap more light. 23. The critical angle depends on the relative difference in index of refraction, larger differences will increase the critical angle and trap more light. 24. The Cobra is an example of supermaneuvering as the aircraft's wings are well beyond the critical angle of attack for most of the maneuver. 25. The Angle of Gissane, or " Critical Angle ", is the angle formed by the downward and upward slopes of the calcaneal superior surface. 26. An advantage of GIXD is that the electric field at the critical angle is amplified locally by a factor of four, making the signal stronger. 27. For planes that are at a critical angle this can mean that the plane will track the Sun around the Earth, forming a Sun-synchronous orbit. 28. The measurement is based on the refraction of light in the process medium, i . e . the critical angle of refraction using a light source. 29. The critical angle occurs when \ theta _ \ mathrm { t } = \ pi / 2, and is approximately 41?for glass in air. 30. Above this critical angle of attack, the aircraft is said to be in a load factor, the center of gravity of the aircraft and other factors.
