Weighing an airplane and its effect on the ground
I weighed an airplane… while it was flying!
https://www.youtube.com/watch?v=hnvtstq3ztI
Grok convinced me that the sound pressure level that you can measure with microphones is the better way to go. It is not the same as the pressure from air molecules moving. But the two pressures can combined. If you know the model of airplane you can use the videos to measure height and speed. You need the atmospheric pressure and a good infrasound recorder. The speed of sound is fast so you need the fast sampling from audio recording. Arrays help. And you need pressure too at high sampling rate. What you are doing is innovative and going sort of in the right direction but your click bait “weighing” is not what is happening since it is a dynamic pressure, and sound is one part of it. You are dissipating power. And it is all frequency and wavelength distributed.
In a way this is “hover craft ground effect” at the extreme. So your drone was much more likely to give you reliable data by looking at a continuously stable hovering target that can have good fast 3 axis accelerometer and a 3 axis gyro. The gyro is actually more sensitive and can give more information. It takes fast dynamic models to use that.
Circulation stores the energy in air. I was reviewing air turbulence again and the assumptions used are not complete. Kolmogorov did not have low nose amplifiers and Gsps ADCs, but they are cheaper now and computers to process the calculations.
When you get to high sound frequencies the speed of sound depends on N2 O2 H2O CO2 Argon concentrations and electrons and ions in some cases. And then droplets of waters in many real situations. It is not impossible.
The gravitational acceleration for a 100 gram lead sphere is G*m/r^2 and that signals does go at the speed of light (I measured it) but that signal is 6.67E-12 meters/second^2 or 6.67 pico (m/s^2) just barely possible but not with garage methods yet. Infer but not direct so easily. There are MEMS gravimeters now but they are not fast enough at low cost. If you search “low cost gravimeters” you will find my old notes. focus on sound pressure and dynamic air pressure, stagnation pressure, shock waves. Seismometers and gravimeters ares sensitive enough to detect the air density variations, and to be used in arrays to measure the atmosphere and oceans and inside the earth. But not cheap enough yet. I am RichardKCollin2 on X and links to gravity stuff is in my profile.
If you can detect a paper airplane you can detect and calibrate your measurements for a sphere . If you shoot the ball(s) across ad catch them and recycle them, you can record for days if needed. Planes are all different. A sphere is easy enough to find lots of data and models. You an use rods and bullets as there is lots of data there too. A bb will have a signal, but in sound, not load cells.
Acoustic levitation is advancing rapidly, the inverse of measuring the effects of a falling mass, or horizontal motion (magnus, Bernoulli and gravity) or parabolic motion (up and down) is possible and acoustic is one way, with video to back it up. Or lidar. Wit exact trajectories it gets simpler.
Really enjoyed your video, it analyses related questions I have had for a long time. I can tell you are going in some right directions. Other times I want to tell you to stop and go another way.
Ask Grok “Tell me the relation between sound pressure and dynamic air pressure””
Grok says clearly: “This shows that the dynamic pressure is orders of magnitude smaller than the sound pressure in typical acoustic scenarios, highlighting that sound pressure dominates in sound wave phenomena.” Not moving air but moving sound waves, compression waves.
All these survival stories are a test and survival. They are all unique, but illuminate the same core values. There are 8.2 Billion humans, all unique, all just trying to survive until the end of a normal life, not one cut short or wasted. This is about 36 minutes. It would take 36*8.2E9/(365.25*60*24) = 561,259.411362 years to tell a short story of survival for each of the 8.2 Billion humans now.
I wonder if early human groups, meeting each other, simply noted what others ate and shared, and mimicked. Offered what they knew was good, helped each other. Noted what animals and insects ate. Just pointed or gestures, maybe made small faces. When I would work with my Dad building things, often we would work without talking. We knew what to do, When the other would need things, we would go get them and bring them back just when they were needed – handed the right way to use, without asking or telling, without words or wasted effort, without anxiety. Any small change was noted, and observed, weighed, remembered, applied. Same in the kitchen, same with gardening, same with cleaning, same with sewing, same with most everything we did – together.
I do not feel particularly awesome, but I try to write from my heart when I enjoy a story. When it brings meaning and new things to mind. When it reinforces good habits, when it makes my day better and encourages. Your story(ies) are explorations, adventures in explaining things no one has ever seen. I see some writing the same story hundreds of times, each with a slight variation to explore all avenues and nuances. Those are also relaxing and affirmative when they reach toward the cores of human existence and choices. Old familiars get told many times, and the really good stories improve with telling, retelling refining.
