Society of Physics and Astronomy’s Post

It's funny, that we flew to the moon and solved artificial intelligence, but yet nobody still knows why planes fly. We have Computational Fluid Dynamics (CFD) which can predict the fluid behavior but they don't tell us how they reached that result analytically. We have various explanation theories. Some say it's because of bernoulli, but with this law planes would not produce lift, so we add other explanations like Kutta Schukowsky conditions, but also these models can only predict lift in a very ideal way. Still not enough to explain what happens on the wing and why a wing produces stall that can bring a plane to fall from the sky. All rough rules of thumb still applied today... Actually it's simple if you look at the question why wings stall. then you finally understand, why Nature invented the feather. It's because of flow separation. which means technically. Because of atmospheric pressure, the air is forced to follow the wings trajectory because it is to fast to revolve on the surface. This circumstance keeps lift alive. But as soon the angle of attack is too big and speed to slow, this can produce a laminar separation bubble which then grow to the diameter which is big enough that the air can go into reverse flow and travels upwards against the flow direction. this then detaches the low pressure parts which keep the air attached on the wing. in consequence the wing stalls and the airplane crashes. #wing #aerodynamics #bionic #lift #flight #feather #bird #nature #stall

In the vast expanse where oceans roam, Where waves dance and winds freely comb, There sails a vessel, bold and new, A beacon of innovation, tried and true. Its hull sleek, its lines refined, A marvel born of the human mind, Through stormy seas and tranquil bays, It charts its course, in innovative ways. Autonomous whispers guide its path, As sensors scan the aftermath, Of waves that rise and currents swift, Yet it sails on, with unwavering drift. No longer bound by human hand, It navigates the sea and land, A testament to progress made, In ship innovation's vibrant cascade. With eco-friendly engines, it glides, Through azure depths and ocean tides, A silent sentinel of the sea, Embracing nature in harmony. Innovative minds, with vision clear, Have banished doubt and conquered fear, For in their hearts, they knew the truth, That innovation, forever youth. So let us raise our voices high, To ships that sail the endless sky, Innovation's flag unfurled, Guiding us to a brave new world. #ship #vessel #sea #tide

In a planetary speed reducer, a spur gear can serve as either the sun gear, planet gears, or the ring gear. Each of these gears plays a crucial role in the operation of the planetary speed reducer. #planetarygear #spurgear #planetgear #ringgear

What is turbulence in an Aircraft ? Turbulence is an irregular motion in the air. It is caused by eddy currents and vertical currents. To be non-scientific it is caused by Rough air in the atmosphere. Lets talk about rough air in high altitudes. Turbulence at high altitudes has 3 causes - mountains, jet streams and stroms. Turbulence in planes is caused by mostly jet streams and thunderstorms. Air associated with jet streams—the narrow, meandering bands of swift winds located near the poles—is caused by differences in wind velocities as an aircraft moves away from regions of maximum wind speeds. The decelerating winds create shear regions that are prone to turbulence. Turbulence has never been the sole factor in a plane crash, though in the earlier days of aviation, it was much more of a threat than it is today. Aircraft are designed to handle light and even moderate turbulence with ease. These little things might help 1. Avoid sitting back of the plane. 2. Practice some grounding techniques 3. If you have a nervous seat mate, strike up a light conversation with them and tell them not to worry as turbulence is very common. 4. Do some breathing exercises. #turbulence #aircrafts

The airplane can fly at a whopping 1.4 times the speed of sound. That’s 925 miles per hour (or 1500 km/h) — while being 1000 times quieter than current supersonic planes.

Check out our recent article with Seongkyu Lee published in AHS Journal. Edge serrations on the rotor blades can reduce broadband noise by over 10 dB in urban air mobility. Read here: https://lnkd.in/e4TDnndk #aeroacoustics #aerodynamics #uam #eVTOL

Here's some information on how to perform a planetary flush on your final drive gearbox! #FinalDriveMotors #TexasFinalDrive #FinalDriveParts #PlanetaryMaintenance #PlanetaryFlush #FinalDriveMaintenance

Aerodynamic forces are generated by the difference in velocity between the rocket and the air.  https://lnkd.in/gHc7hgCQ

Wake Vortex Turbulence Description All aircraft generate vortices at the wing tips as a consequence of producing lift. The heavier the aircraft and the slower it is flying, the stronger the vortex. Among other factors, the size of the vortex is proportional to the span of the aircraft which generates it. At low altitudes, vortices generally persist for as long as 80 seconds, but in very light or calm wind conditions, they can last for up to two and a half minutes. Once formed, vortices continue to descend until they decay (or reach the ground). Decay is usually rapid and occurs more quickly in windy conditions. Cross-winds can carry a vortex away from the flight path of the aircraft.

Wake Vortex Turbulence Description All aircraft generate vortices at the wing tips as a consequence of producing lift. The heavier the aircraft and the slower it is flying, the stronger the vortex. Among other factors, the size of the vortex is proportional to the span of the aircraft which generates it. At low altitudes, vortices generally persist for as long as 80 seconds, but in very light or calm wind conditions, they can last for up to two and a half minutes. Once formed, vortices continue to descend until they decay (or reach the ground). Decay is usually rapid and occurs more quickly in windy conditions. Cross-winds can carry a vortex away from the flight path of the aircraft.