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CapnOz

Windmilling on the NGX

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I would like to know if she is going to have realistic windmilling effects on the ground?

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I don't think so. Ryan can explain why. :(

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I don't think so. Ryan can explain why. :(
As robert said, yes. And Ryan had actually explained back in January how it was modeled...sort of

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Windmilling effect?? Someone can explane what that is?Ryan or Robert?? :(

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Windmilling effect?? Someone can explane what that is?Ryan or Robert?? :(
It's what a windmill does. Engines do the same if there is enough wind.Look here. Cheers.

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It's what a windmill does. Engines do the same if there is enough wind.Look here. Cheers.
Ooh that's windmilling? Ha! I thought something whole different, but okay....

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Windmilling effect?? Someone can explane what that is?Ryan or Robert?? :(
Cmon your dutch! You should know :(

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Cmon your dutch! You should know :(
HA!Does Windmilling create power though?

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On the ground, not really, no. Hopefully the wind is not blowing that fast.That's also not mentioning that, even if it was, the aircraft is normally parked at a gate, which has a terminal of a pretty good height in front of it, blocking most, if not all of the wind. The fan will still spin, but the wind still won't be fast enough to do much other than spin it. It's actually kind of interesting in that a lot of them sound like tumblers when they spin.

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HA!Does Windmilling create power though?
1_5_Mega_Watt_1500kw_Windmill_Generator.jpg

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HA!Does Windmilling create power though?
It doesn't. It's similar to idling in a car if a jet engine does it. No energy is being produced to move the plane forward.Windmills in and of themselves use a series of gears and levers to do the work they were designed to do (pump water, mill wheat, etc.). It's a relatively simple mechanical system, but is prone to breakdowns.

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Lol guys, I'm not joking but I live in the polder here and if you take off from Lelystad - EHLE, you see a "sea of windmills" I'm not exaggerating but I think you will see a few hundred's of windmills

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Gents-Yes.
hahahahahahahahaha, I dunno why but that is the funniest post Iv seen from Rob. He normally gives out great loads of details for little things but this time its just "Yes"

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Lol guys, I'm not joking but I live in the polder here and if you take off from Lelystad - EHLE, you see a "sea of windmills" I'm not exaggerating but I think you will see a few hundred's of windmills
Windmills or windturbines? There's a difference. In Delft we have 1 windmill and a few windturbines around the Technische Universiteit.

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Windmills or windturbines? There's a difference. In Delft we have 1 windmill and a few windturbines around the Technische Universiteit.
Windturbines yes, sorry.

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- windmilling does NOT produce energy. Its is simply the first stage (N1) compressor blades spinning due to wind blowing across them.

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something I always wondered about seeing engines windmill is does it not cause extra wear and tear having an engine slowly turning with no Oil pump/Oil Pressure to keep it lubricated? I know its only turning slow but its still metal + metal

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It's what a windmill does. Engines do the same if there is enough wind.Look here. Cheers.
You never asked a question on these forums without going to google first?

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something I always wondered about seeing engines windmill is does it not cause extra wear and tear having an engine slowly turning with no Oil pump/Oil Pressure to keep it lubricated? I know its only turning slow but its still metal + metal
Im guessing whatever the fan is connected to - some sort of shaft (no sexual innuendo implied...) is lubricated so it can spin freely.Im guessing the noise it makes is to warn ground grew that the turbine is spinning which I'm guessing if something did get drawn into it by the wind cause some minor damage to the fan blades themselves, or a moor extreme example of someone sticking their hand into the fan blades and even at that speed could cut it clean off.Cheers,Tim

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Im guessing whatever the fan is connected to - some sort of shaft (no sexual innuendo implied...) is lubricated so it can spin freely.Im guessing the noise it makes is to warn ground grew that the turbine is spinning which I'm guessing if something did get drawn into it by the wind cause some minor damage to the fan blades themselves, or a moor extreme example of someone sticking their hand into the fan blades and even at that speed could cut it clean off.Cheers,Tim
I'm in training on the 737, but I flew the 727 for a while which had the old JT8D engines. I'm assuming the noise the CFM56 makes when windmilling is the same that the JT8D made, though I suppose I could be wrong, but what caused that was actually the fan blades. Click here to see that the base of a fan blade is shaped so that it fits into a slot (ignore the arrow and mid-span shroud - just look at the base of the blade). When the fan stage is just windmilling, the blade has a little room in the slot, so as it rotates, it makes a clinking sound. But don't worry, there is no grinding metal as it windmills.David Lynn

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David,Ahh ok that makes sense.I was watching a documentary on Rolls Royce making their turbofan engines and they showed the gap and it is literally nanometers. I just thought it would of been more of a safety feature but i guess that seems to be a by-product... Unless you hear it so much you stop listening. Cheers,Tim

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Inflight if a turbine engine fails and is still windmilling (assuming it doesn't seize when it fails) it will produce some benefits. The core will windmill at a considerable speed which will be turning the accessory gearbox. So you will get some residual hydraulic power. If the engine failure was due to a flameout from weather or an interuption of the fuel flow, the engine can be relit by simply reintroducing fuel and ignition. The starter isn't required. There are minimum N2 speeds listed in the checklist for an inflight restart. The checklist will usually tell you a minimum speed to fly at various altitudes to achieve the N2 speed for a restart without starter assistance. If the N2 is below the minimum you will use the starter just like a normal start on the ground. It's all layed out in the abnormal checklists. Hiram Hunt

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something I always wondered about seeing engines windmill is does it not cause extra wear and tear having an engine slowly turning with no Oil pump/Oil Pressure to keep it lubricated? I know its only turning slow but its still metal + metal
Not really- the Engineers took that into account. There are very very high precision bearings on the spools and shafts. Not to mention they are very well lubricated.Little or no wear.

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You never asked a question on these forums without going to google first?
Nope. I even google what I'll have for lunch every day. I can't live without Google. But what does it matter to you?

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