Timeline for Why are fighter jets so loud when doing slow flight?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Oct 10, 2022 at 15:25 | comment | added | Michael Hall | Ok guys, please take the automotive metaphor over to chat - this is not productive or particularly insightful... | |
| Oct 10, 2022 at 15:21 | comment | added | quiet flyer | 2) If we say that a nose-high pitch attitude is somehow equivalent to climbing a hill, then the logical conclusion is that we are most efficient with the pitch attitude as flat as possible-- which is not true in most cases. Basically what I'm trying to say is that any analogy that misses the point that induced drag increases when we fly extremely slowly, regardless of the trajectory of the resulting flight path, is missing the main point. | |
| Oct 10, 2022 at 15:20 | comment | added | quiet flyer | @user253751 -- ok, so you are saying that when a plane flies slowly, it's like a car driving on a slope that is somehow automatically controlled to raise up steeper the slower the car goes. Ok.. so 1) how does that give any real insight? You might as well say that a drogue parachute is automatically programmed to open when the car goes slow, or the brakes are programmed to apply whenever the car goes slow. 2) If we say that a nose-high pitch attitude is somehow equivalent to climbing a hill | |
| Oct 10, 2022 at 13:22 | comment | added | sdenham | I have seen the claim that wake vortices somehow cause induced drag rightly disputed, but anyone wishing to dispute there being a causal dependency of induced drag on AofA should first consider what Peter Kämpf wrote in his 3rd. paragraph of aviation.stackexchange.com/a/5056/1981 : "The wing creates lift by deflecting air downwards. This happens gradually over the wing's chord, and creates a reaction force orthogonally to the local speed of air. This means the reaction force is pointing up- and slightly backwards. This backwards component is induced drag!" (my emphasis.) | |
| Oct 10, 2022 at 12:34 | comment | added | Criticizing Israel not allowed | @quietflyer I'm not sure what is so difficult about "think of slow flight as climbing a hill, not as driving slowly" for a layperson. Yes, you aren't going up. So what? It's an analogy. | |
| Oct 10, 2022 at 12:30 | comment | added | Criticizing Israel not allowed | @quietflyer hence why the analogy was the slope of the mountain and not the speed of the car! | |
| Oct 10, 2022 at 10:38 | comment | added | Criticizing Israel not allowed | @quietflyer it requires much more power if the reason it is going slowly is that it is going up a steep mountain! | |
| Oct 9, 2022 at 14:57 | comment | added | Michael Hall | @quietflyer, motivation for that phraseology is to keep the aero PHDs who insist there’s no cause and effect relationship off my back. ;) | |
| Oct 9, 2022 at 13:13 | comment | added | quiet flyer | @slebetman-- actually-- the car makes less drag, and requires much less power, going slower than going faster. With no exceptions. What you are talking about is just a gearing/motor rpm issue, which basically doesn't exist in airplanes, and certainly not in pure jets. (And also not in electric cars!) | |
| Oct 9, 2022 at 5:40 | comment | added | quiet flyer | What is the motivation for saying that operating at very high angles-of-attack does not actually cause the associated increase in induced drag? | |
| Oct 9, 2022 at 3:02 | comment | added | slebetman | Don't think of slow flight as the same as driving slowly in your car. Think of it as driving your car up a very steep mountain - you will slow down, yes, but you will also need to rev your engine up on low gear. | |
| Oct 8, 2022 at 15:39 | vote | accept | Boeing787 | ||
| Oct 8, 2022 at 15:23 | history | answered | Michael Hall | CC BY-SA 4.0 |