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Speed Brakes?

 
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ranjanmehta
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PostPosted: Sat Aug 15, 2009 12:14 am    Post subject: Speed Brakes? Reply with quote



Was wondering, isn't this a little too high for speed brakes to be deployed? Or are these not speed brakes Razz

Thanks,
Ranjan


Last edited by ranjanmehta on Sun Oct 04, 2009 11:16 pm; edited 1 time in total
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con spirito
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PostPosted: Sat Aug 15, 2009 11:17 am    Post subject: Reply with quote

Ofcourse it is, but these days speed brakes are not only used for reducing speed, but also for assisting the ailerons during a roll. So usually the speed brakes on the upgoing aileron side spring up during a roll.
The speed brakes which are used when airborne and during a roll are called Flight spoilers. Ground spoilers are used on the ground only to shorten the landing roll. The spoilers in this pic are flight spoilers.
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rutvij
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PostPosted: Sat Aug 15, 2009 11:41 am    Post subject: Reply with quote

Aren't the Flight Spoilers same as Ground Spoilers? From my 'layman'ish Observations, the Spoiler deployment is rather limited in air, than on ground. Is that the difference?
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iflytb20
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PostPosted: Sat Aug 15, 2009 11:47 am    Post subject: Reply with quote

Usually the outermost and the innermost spoilers are the Ground spoilers. They deploy on the ground only and their deflection is greater than that of the Flight Spoilers.

The flight spoilers work in two ways, like Mr Pink Panther explained. If you want to slow down, you use the Flight spoilers and all of the spoiler panels are deployed. You can use it all the way upto the aircraft's service ceiling.

Now many big planes have 2 ailerons - Low speed and High speed. Low speed ailerons are the one near the wing tip. High speed ones are closer to the root. In this pic you can see the high speed aileron between the two flap section. The reason is that at high speeds, the twisting force generated by an deflected aileron could lead to a control reversal. By placing an aileron closer to the root, this problem is avoided. An point to note - The A310 has an High Speed aileron only.

Now for aircraft with only Low speed ailerons, the flight spoilers are used as an secondary roll device. The main aileron deflection is reduced and the spoilers deploy to help roll the aircraft. The spoilers deploy on one side only [for obvious reasons] and they deploy one at a time - root to tip. That means that the first spoiler to deflect would be the innermost one, the the one outboard of it and so on. In our 737s, the spoilers start to deploy if the control wheel is moved more than 10 degrees.

PS: And the fact that the flaps are out indicates that the aircraft is below 20000 ft. This because most if not all of the aircraft manufacturers have a "maximum flap usage" altitude of 20000ft.

PPS: Is this a A310-200 in the pic??
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sushank320
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PostPosted: Sat Aug 15, 2009 12:50 pm    Post subject: Reply with quote

Yea looks like an A310 from the pic, could also be an A300-600 ?

btw, why have the flaps been extended so high ?
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iflytb20
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PostPosted: Sat Aug 15, 2009 12:53 pm    Post subject: Reply with quote

sushank320 wrote:

btw, why have the flaps been extended so high ?


How do you know its high?? I guess ranjan will know better about when/where this pic was taken
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HAWK21M
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PostPosted: Sat Aug 15, 2009 3:24 pm    Post subject: Reply with quote

Those are Flight spoilers that function along with the Aileron to assist roll & on ground function as Speed brakes.
Any details on the Alt of this Aircraft.
regds
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rutvij
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PostPosted: Sat Aug 15, 2009 8:33 pm    Post subject: Reply with quote

Many Thanks to all who took the pain to explain! I'm gonna read tb20's reply 10 times to understand. Confused

Btw, this is an A300.


A310 Wingtip:
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iflytb20
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PostPosted: Sun Aug 16, 2009 9:14 am    Post subject: Reply with quote

rutvij wrote:
Many Thanks to all who took the pain to explain! I'm gonna read tb20's reply 10 times to understand. Confused


I can try and explain it again if you want pal

Quote:
Btw, this is an A300.


Thanks for the pics...wasn't sure about it
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ssbmat
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PostPosted: Sat Aug 22, 2009 9:22 am    Post subject: Reply with quote

sushank320 wrote:
Yea looks like an A310 from the pic, could also be an A300-600 ?

btw, why have the flaps been extended so high ?


dont be fooled by the cloud cover below the wing. If you look at the sky above, it looks like the plane may have already left the higher altitudes.

This kind of cloud cover can be found even at heights below 10000 feet, which is a normal altitude for deploying the initial flaps.
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stealthpilot
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PostPosted: Mon Aug 24, 2009 11:28 pm    Post subject: Reply with quote

Just to add (yet again Smile) to iflytb20 who was presumably speaking about the 738.
The speed brakes can be used at any altitude (with certain considerations of course…) on most airliners that I am aware of.

On the a320 the speed brakes are the middle 3, roll spoilers are the outer 4 and all 5 ground spoilers deploy once you land.

By the way, nice picture...
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