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GTIR
19,078 posts
135 months
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Cock Womble 7 said: GTIR said: What's in the other hand? If you have to ask, you can't afford it. Is £2.50 enough?
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mattdaniels
5,116 posts
151 months
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On the London Midland train in to Euston. Every now and again, the aircon blowers stop for a few seconds, and this coincides with the at-seat power cutting off too - there is a chorus of beeps from various laptops as they switch over to battery mode and then back again to mains power shortly after.
Why does that keep happening?
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GTIR
19,078 posts
135 months
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mattdaniels said: On the London Midland train in to Euston. Every now and again, the aircon blowers stop for a few seconds, and this coincides with the at-seat power cutting off too - there is a chorus of beeps from various laptops as they switch over to battery mode and then back again to mains power shortly after.
Why does that keep happening? As the train travels along the track it gets power spikes from the live line, either above or from the track, and as it switches over or gets a spike the inboard transformers cut power to the carriages and funnel all power to the motors/electrics. Once the electronics sort everything out they restore power. It also happens in tube trains. (I don't know. I just made all that up)
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Ayahuasca
16,058 posts
148 months
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Trim tabs on control surfaces (aircraft or marine) - how do they work? I get the idea that pressure on the little trim tab moves the big control surface, which moves the aircraft / boat. What I don't get is why the big control surface doesn't say 'f  k you' to the small trim tab and move back again to where it was happier. ??
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Jobbo
7,235 posts
133 months
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Trim tabs don't move the whole control surface, they move a small tab on the end of it.
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kiwifraser
4,264 posts
63 months
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Ideally, how many hours sleep should a healthy 37 year old male need each night?
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Pixel Pusher
4,703 posts
28 months
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kiwifraser said: Ideally, how many hours sleep should a healthy 37 year old male need each night? A male what? 
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DeadMeat_UK
3,053 posts
151 months
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Pixel Pusher said: kiwifraser said: Ideally, how many hours sleep should a healthy 37 year old male need each night? A male what? You're not really confused now are you, dear. I'm sure if you thought about it for, oh, a nanosecond, the right and most obvious answer might spring to you. If you are really confused, I'd hate to see how you coped with real life with so many bleedin obvious assumptions to be made every day.
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Ayahuasca
16,058 posts
148 months
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Jobbo said: Trim tabs don't move the whole control surface, they move a small tab on the end of it. They ARE the small tab on the end of it. But they must move the control surface.
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Silent1
17,600 posts
104 months
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Ayahuasca said: Trim tabs on control surfaces (aircraft or marine) - how do they work? I get the idea that pressure on the little trim tab moves the big control surface, which moves the aircraft / boat. What I don't get is why the big control surface doesn't say 'f k you' to the small trim tab and move back again to where it was happier. ?? Pressure equalisation, big movement on the small tab equals small movement on the big tab 
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PoleDriver
20,229 posts
63 months
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Ayahuasca said: Jobbo said: Trim tabs don't move the whole control surface, they move a small tab on the end of it. They ARE the small tab on the end of it. But they must move the control surface. No. They do the same job as the control surface but to a much smaller extent! They are small and just deflect the air sufficiently to 'trim' out any effects which are making the plane veer from a dead straight heading!
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Ayahuasca
16,058 posts
148 months
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Silent1 said: Ayahuasca said: Trim tabs on control surfaces (aircraft or marine) - how do they work? I get the idea that pressure on the little trim tab moves the big control surface, which moves the aircraft / boat. What I don't get is why the big control surface doesn't say 'f k you' to the small trim tab and move back again to where it was happier. ?? Pressure equalisation, big movement on the small tab equals small movement on the big tab OK, but then the big tab, as it is deflected by the small tab, moves further out into the airflow, so the air pressure on the big tab is muchly increased so WTF doesn't it kick back against the small tab?
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Pixel Pusher
4,703 posts
28 months
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DeadMeat_UK said: Pixel Pusher said: kiwifraser said: Ideally, how many hours sleep should a healthy 37 year old male need each night? A male what? You're not really confused now are you, dear. No. No I'm not, sorry.  8.1 hours should guarantee that you wake refreshed and ready to face the challenges of a new day Kiwifraser.
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Silent1
17,600 posts
104 months
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Ayahuasca said: Silent1 said: Ayahuasca said: Trim tabs on control surfaces (aircraft or marine) - how do they work? I get the idea that pressure on the little trim tab moves the big control surface, which moves the aircraft / boat. What I don't get is why the big control surface doesn't say 'f k you' to the small trim tab and move back again to where it was happier. ?? Pressure equalisation, big movement on the small tab equals small movement on the big tab OK, but then the big tab, as it is deflected by the small tab, moves further out into the airflow, so the air pressure on the big tab is muchly increased so WTF doesn't it kick back against the small tab? It does but it can't push it all the way back as the force decreases as it's deflection decreases whilst the deflection is increasing on the trim tab until it reaches equilibrium.
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Ayahuasca
16,058 posts
148 months
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Silent1 said: Ayahuasca said: Silent1 said: Ayahuasca said: Trim tabs on control surfaces (aircraft or marine) - how do they work? I get the idea that pressure on the little trim tab moves the big control surface, which moves the aircraft / boat. What I don't get is why the big control surface doesn't say 'f k you' to the small trim tab and move back again to where it was happier. ?? Pressure equalisation, big movement on the small tab equals small movement on the big tab OK, but then the big tab, as it is deflected by the small tab, moves further out into the airflow, so the air pressure on the big tab is muchly increased so WTF doesn't it kick back against the small tab? It does but it can't push it all the way back as the force decreases as it's deflection decreases whilst the deflection is increasing on the trim tab until it reaches equilibrium. OK, so far so good. What I don't get is, if the force on the large tab is not enough to push the small tab i.e both have equal pressure on them, how does the large tab then move the aircraft / ship around?
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walm
3,441 posts
71 months
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Ayahuasca said: OK, so far so good. What I don't get is, if the force on the large tab is not enough to push the small tab i.e both have equal pressure on them, how does the large tab then move the aircraft / ship around? I thought they were to help adjust the equilibrium. So instead of applying a constant pressure on the LARGE tab in order to get an aircraft to climb, you move a trim tab to apply the pressure for you. So you start by forcing the LARGE tab into the flow of air by pulling on the yoke. That moves the plane. Then once you are in a constant climb you still need to apply some pressure to keep the plane climbing. You could either keep pulling on the yoke or use a trim tab in the opposite direction to the LARGE tab in order to do the work instead. Once at equilibrium like that you will be in a constant climb with no pressure needed by the pilot. Then if you want to slow the climb you could either push down on the yoke or release some of the pressure created by trim tab by lowering it back down. I think.
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Ayahuasca
16,058 posts
148 months
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I am thinking more of a yacht where a small windvane moves a small trim tab that moves a large rudder that turns the boat.
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PoleDriver
20,229 posts
63 months
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Ayahuasca said: I am thinking more of a yacht where a small windvane moves a small trim tab that moves a large rudder that turns the boat. The trim tabs on an aircraft are a separate entity. They don't move the main control surfaces but act on their own to give a semi-permanent offset!
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Carthage
2,975 posts
13 months
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ISPs - I've been trying to get BT to connect me all day. Not only haven't they done it (after waiting a fortnight) but they now can't tell me when they will be able to. I need it for work.
A friend recommended another Broadband provider - beginning with an 'e' but I have forgotten the name and googling hasn't worked (for me anyway).
Anyone know?
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Famous Graham
26,537 posts
94 months
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BlackVanDyke said: Carthage said: BlackVanDyke said: You seem to have mistaken me for someone who wears such garments.  My apologies, I assumed you were speaking from experience rather than observation. I remain unconvinced that adding padding is for either covering nipples (I mean, who cares?) or comfort. If it's (mostly) not covering nipples, it's got to be SOMEthing, though... could it possibly be just to make the bras on the shelf look the same as the smaller sizes, so that women don't feel somehow left out, despite patently not needing the padding? Shape? I suspect it's all of the above tbh.
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