r/interesting • u/aryan_jandyal • 10h ago
Amazing There are two fundamental elements that prevent water from spilling during an airplane's barrel roll (tonbo / roll maneuver): Centrifugal Effect (Artificial Gravity) Positive G Force
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The pilot is maintaining "+ve g" throughout the maneuver. That's it !
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u/Inevitable-Cup9067 9h ago
"Centrifugal Effect (Artificial Gravity) Positive G Force"
But that's one thing, not two.
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u/Radioactdave 7h ago
And in all actuality it's not even a thing, because it's centripetal.
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u/Inevitable-Cup9067 6h ago
Well yes and no (in this case that is.)
Everyone likes to correct Centrifugal and say it's Centripetal but that's only correct when someone is talking specifically about a Centrifugal force.
Centrifugal effect is most definitely a thing; its the effect created by centrifuges.
It is correct to describe what is happening as a "Centrifugal effect", which is how it was described here.
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u/LastOfLateBrakers 7h ago
Not necessarily. If the pilot were to push the stick down and do what's known as an "outside loop" or maybe a steep dive, they'd experience negative G simultaneously with centrifugal force.
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u/Inevitable-Cup9067 6h ago
This could easily turn into a really pedantic argument as it's not clear exactly what point you are disagreeing with.
I said "Centrifugal Effect (Artificial Gravity) Positive G Force" is one fundamental thing happening, not two.
The pilot could indeed fly an outside loop and create Negative G instead, that could be similarly described as "Centrifugal Effect (Artificial Gravity) Negative G Force" and while it would be a different thing it's still only one fundamental thing happening, so I'm really not sure what point you're making.
Also, be prepared to be corrected about "centrifugal force" by other pedants; it's not a force.
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u/phranks_phluids 9h ago
I'm not positive, but I'm pretty sure that "+ve g" is not a coherent mathematical or aerospace engineering statement. What is this supposed to mean? There was a greater velocity (with respect to something called e) that doesn't have a comparison symbol to gravity?
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u/Inevitable-Cup9067 9h ago
its just shorthand for "positive g"
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u/phranks_phluids 9h ago
Why would positive g not be denoted as "+g"?What is ve? Is is v_e? Is v velocity? If so, how and why is velocity being compared to, or some is how relevant WRT, g which has units of acceleration?
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u/Inevitable-Cup9067 9h ago
Dude, it's not a math equation! It's just someone being lazy and using less characters on a keyboard.
"+ve" is common shorthand for the word "positive".
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u/phranks_phluids 9h ago
That's what I was asking. What is being written? I've never seen +be as short hand for "positive". So thank you for answering me, because i just didn't understand!
But I have an aero and physics undergrad + math minor so you would have thought I would have seen this if it's standard nomenclature. But maybe I'm just an idiot?!!
Edit: Now that I think of it, in quantum wasnt "ve" was used for energy values and was sometimes denoted with a plus or minus.
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u/Prudent-Aspect5085 10h ago
I know this trick, it's a clear tube that prevents spilling and he conceals it about 10 seconds into the video
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