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| So I've been building an ultralight |
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| RandyT:
That's why I don't fly. I'm lucky if I take a minute to kick the tires on my vehicle before piling in and driving off. :D But on the large jet airliners, I get the feeling that the engines are so powerful and the passengers/cargo make up such a small percentage of the overall weight distribution, it only becomes an issue if they get overloaded. I could be wrong, but I have never seen passengers moved around on a half-booked flight or the luggage guys do anything other than just toss the baggage into the hull of the craft "willy-nilly". |
| danny_galaga:
The further away from the centre of gravity, the more effect it will have. Trust me, you may never see them ever have to move people around, but they have to do those calculations by law. If you think about it, 100 passengers is maybe 8000kg. That's not insignificant.. pretty much any wing stalls at about 14° angle of attack. If that's exceeded it doesn't matter how powerful the engine is, you've stalled. And if you are tail heavy, you may not have enough elevator to unstall it. In fact being tail heavy probably caused the stall in the first place. Here's the basics of what happens with weight and balance https://aerocorner.com/blog/aircraft-weight-and-balance/ https://youtube.com/shorts/nkYgznZLgyo?si=VvVBVoSdhWv6SpX3 |
| RandyT:
--- Quote from: danny_galaga on July 22, 2024, 11:31:32 pm ---The further away from the centre of gravity, the more effect it will have. Trust me, you may never see them ever have to move people around, but they have to do those calculations by law. If you think about it, 100 passengers is maybe 8000kg. That's not insignificant.. pretty much any wing stalls at about 14° angle of attack. If that's exceeded it doesn't matter how powerful the engine is, you've stalled. And if you are tail heavy, you may not have enough elevator to unstall it. In fact being tail heavy probably caused the stall in the first place. Here's the basics of what happens with weight and balance https://aerocorner.com/blog/aircraft-weight-and-balance/ https://youtube.com/shorts/nkYgznZLgyo?si=VvVBVoSdhWv6SpX3 --- End quote --- I think the thing that makes commercial airlines a bit more forgiving is that the wings (and engines) are pretty much centered with the cargo. I'm not sure it's possible for the positioning of people to throw that off beyond what the flaps, etc. are rated for, unless for some reason 1st class and half of coach is empty and everyone else is sitting together. But on the luggage side of things, I can see them weighing the carts full of luggage, and doing their best to distribute that as evenly as possible in multiple holds. But like you said, in the case of a rugby team, they would flock together. Everyone else would find a new seat and naturally disperse if allowed to (from personal experience.) Although, I'm not sure that is permitted anymore. On the flip side, I wonder how all of that changes when the craft is empty. I know they are loathe to move them in that state, but I imagine it must be done on occasion. |
| pbj:
Yeah, I’ve been asked to move before for weight distribution. Can’t recall having to do it on anything like a 737, but it’s happened several times on smaller ones. Hooray obesity. |
| danny_galaga:
As long as you are under 160, we can fly in my plane 🙂Although at 160, I do t think we can carry any fuel... |
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