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| When a Stall becomes uncomfortable! | |
David Bartlam   19th Jun 2012 13:03:35 | So, there was I.. flying along happily last night and coming onto final into Birmingham in my A380... All going so well! I decided to reduce speed from 200knts to 180knts for the approach.. Then the alarms start going off, I turn autopilot off and dropping from 3,500ft.. Was unable to recover from the stall.. Killing Mrs Morgans cat that I was transporting, much to the disgust of Mrs M.. Whoops..
Right, so theres the scenario... Now I need an answer (If possible)... I wasn't aware of the stall speed and not certain how to calculate it so I was just guessing (Bad mistake in the aviation world). Ive been searching online this morning for ways of calculating stall speeds but Ive come across a few methods where certain people of the sites are talking in german, french, latin or whatever language all those calculations were! Just wondering if anyone can shed some light on how to calculate the stall speed of an aircraft (In its simplest, understandable terms)... That way, I can use it in the future and avoid murdering my feline friend... |
James Nugent 19th Jun 2012 17:08:35 | I've never heard of a formula for calculating stall speeds. The speed an a/c stalls at depends on a number of things. If you're in a turn, the stall speed increases, same when you're heavy etc.
That's one thing I think is a problem; people just leaving full fuel in their tanks and not adjusting it. AFAIK, you should land with centre tank empty. This website has loads of A/c manuals, but unfortunately nothing for the A380 yet.. http://www.smartcockpit.com/ |
Martijn de Niet   19th Jun 2012 17:30:44 | how about getting a manual?? :P not sure where to get em but basically thats the only thing presenting some sort of speed graph. ( Minimum Flaps Down Approach Speed ) |
Andy Mooring   19th Jun 2012 17:41:35 | I have a better solution when going into a stall.......Hit the escape key ;o) |
| David Bartlam 19th Jun 2012 18:12:02 | Yep, definitely a formula... Take a look!
Never mind, I thought there'd be something like aircraft weight, speed, pressure etc but its all quite in-depth and more suited to the Carol Vordermans of the world http://www.aviation.org.uk/docs/flighttest.navair.navy.milunrestricted-FTM108/c3.pdf |
Clive Northrop  19th Jun 2012 18:14:28 | You probably need to know your flap extend speeds too... but the A380 is not known much about in these neck of the woods. |
| David Bartlam 19th Jun 2012 18:18:53 | Yea there's alot that needs to be taken into consideration... Suppose I'll have to make do with guesstimations ;)
Cheers for the replies though |
Graeme Brown  20th Jun 2012 10:13:04 | I don't fly Airbus, rather I fly the 737NG. I would have thought that as in the 737 the stall speeds would be clearly displayed on the speed tape on the PFD as colour coded regions. These update according to flap configuration, weight, etc.
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| John Godfrey 20th Jun 2012 12:38:12 | When in doubt fly on an AOA. In the Boeing there are yellow eyebrows on the EADI that show the critical angle of attack (in landing configuration)...long as your pitch doesn't exceed this your fine.
Another PFD options is an analogue angle of attack display. 
The red line is the angle for stick shaker activation, the green band is the range of approach AoA. Don't about airbus's equivalent system to display this sort of information. |
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