ส่องตัวเลข ขอนเจ้าแม่ตะเคียน งวด 1 มิ.ย. 2562
Airports are needing to study the wake turbulence of aircraft taking off at large airports to improve safety. Wake turbulence has caused many accidents between large aircraft and smaller ones literally turning the aircraft upside down and putting it into a death spiral.
from: http://ezinearticles.com/?Studying-Wake-Turbulence-at-Airports-Using-the-Sun-As-Background&id=81927
