Self-tutoring about airships: the tutor compares the lifting power of helium and hydrogen. Helium’s atomic mass is 4.0, while hydrogen’s is 1.0. However, hydrogen is diatomic, meaning it will only exist, by itself, as H2, bringing its mass to 2.0 …
Self-tutoring about aviation terms: the tutor mentions ground effect. ground effect: increase of effective lift when craft flies closely over a surface such as the ground. The closer the wings are to the surface, the more pronounced the ground effect, …
Self-tutoring about aviation: the tutor mentions FOD. FOD: foreign object debris or foreign object damage. As I understand, FOD is strongly associated with jet engines, whose air intake can draw in nearby articles such as trash, loose vegetation (from an …