Planes clouds and vortices

Regarding your 2nd answer, taking off quickly after another aircraft has departed is difficult because of wake turbulence. The most hazardous part of wake turbulence is the spiraling wingtip vortices which can be observed in this neat video: ▶ this video One notable wake turbulence incident was in 2006 at Boeing Field in Seattle where a Cessna 172 and Boeing 747 were both on final approach for parallel runways. The Cessna 172 got flipped almost upside down and recovered 150 feet over the terrain: [link]

in “Incorrect Lift Theory” · View on HN

For anyone interested, there are several great youtube videos[1-4] that show the wakes (the wingtip vortices in particular) created by various aircraft. This incident brings the Reduced Vertical Separation Minima (RVSM)[5] into question. Strategic Lateral Offset Procedure (SLOP)[6] can be used used to avoid such incidents. [1] [link] [2] ▶ this video [3] [link] [4] [link] [5] [link] [6] [link]

in “Enroute Airbus A380 wake flips Challenger business jet upside down” · View on HN

Two quick errata: In Sound / Biology, a control inversion: low pitch (slider and sound) animates blue short hairs, and high pitch animates long red. In the windtunnel > Wing, lift is reported but the airstream remains undeflected.[1] [1] randomly, fwiw, I've used cloud deck slicing to illustrate downdraft, eg [link] [link] . Or perhaps moments of "yoink" like... err, ▶ this video .

in “Show HN: Interactive physics simulations I built while teaching my daughter” · View on HN

One concept is "heavier than air" flight is throwing air downward. Visuals help: [1] [link] [2] [link] [3] [link] [4] ▶ this video

in “Ask HN: What scientific phenomenon do you wish someone would explain better?” · View on HN