Vivek1979
Topic Author
Posts: 50
Joined: Thu May 30, 2002 5:40 am

Spoilers Vs. Airbrakes

Thu May 30, 2002 10:43 am

Aren't they same thing? Or are they different on bigger planes.
 
FredT
Posts: 2166
Joined: Thu Feb 07, 2002 9:51 pm

RE: Spoilers Vs. Airbrakes

Thu May 30, 2002 6:31 pm

They're not always the same, no. Check the airbrakes on an F-28. They're very clearly not spoilers...

Cheers,
Fred
I thought I was doing good trying to avoid those airport hotels... and look at me now.
 
Fokker Lover
Posts: 523
Joined: Fri May 10, 2002 10:05 am

RE: Spoilers Vs. Airbrakes

Fri May 31, 2002 8:35 am

On F28's and F100's the spoilers are called lift dumpers. There are 5 on each wing and they can only be deployed on the ground. The speed brakes are two large barn doors that are mounted where the tail cone should be. When they are open there is a span of twelve feet from tip to tip. Speed brakes are used in flight and they work very well. On an F28 the control lever is about a foot long (on the captains side of the center pedestal) and the pilot can control how far he wants to open them. On an F100 the lever is about 3 inches and the speed brakes are either open or closed. There is no in between. Man, I love talking about Fokkers. I think it's some kind of sickness.......
10,000 years ago we would have eaten you. Today, we drag you along and allow you to pollute the gene pool.
 
NKP S2
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Joined: Mon Dec 20, 1999 3:16 am

RE: Spoilers Vs. Airbrakes

Fri May 31, 2002 4:03 pm

For most A/C out there, Spoilers ARE speedbrakes in many cases, but it depends upon the A/C...and/or whether the A/C is in flight or on the ground...and/or if the spoilers are used for roll control or true "speedbrakes". Often, a distinction must be made between 'Flight Spoilers' and 'Ground Spoilers', even if flight spoilers are deployed on the ground. A "one size fits all" answer is difficult in this ( and most other systems ) questions on commercial airliners. -- As 'Fokkerlover' ( and 'FredT' ) pointed out, Fokker jets do not combine the two functions in one set of flight controls.
 
broke
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RE: Spoilers Vs. Airbrakes

Fri May 31, 2002 8:19 pm

Boeing jets pretty much use spoilers for three different things. First, as part of the flight control system in conjunction with the ailerons to roll the airplane (you'll will see the outboard spoilers go up on the wing that is going down); second, as speed brakes (usually used when you want to descend quickly, can also be used if ATC gives the crew a significant speed reduction, outboard spoilers only); third, to decrease lift when landing (used only after the airplane is on the ground, all spoilers).
The DC-8 only uses spoilers on the ground to reduce lift. In flight, it can use the inboard thrust reversers to slow or descend. The DC-9/MD-80 family uses spoilers in a similar manner as the Boeing jets.
I believe that the A-300/A-310 family also uses spoilers similar to the Boeing jets.
I believe the BAE 146 has a speed brake similar to the Fokker's, but I don't know about it's spoiler system.
 
SailorOrion
Posts: 1959
Joined: Tue Feb 06, 2001 5:56 pm

RE: Spoilers Vs. Airbrakes

Fri May 31, 2002 9:39 pm

Broke is right about the BAE146:


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Photo © Daniel Werner



you can clearly see the deployed spoilers (lift dumpers) on the wing, and the speedbrakes at the tail.

SailorOrion
 
Vivek1979
Topic Author
Posts: 50
Joined: Thu May 30, 2002 5:40 am

RE: Spoilers Vs. Airbrakes

Sun Jun 02, 2002 12:24 am

Thank you all for your input.
 
MagicMan_841
Posts: 177
Joined: Sat Jan 19, 2002 8:12 am

RE: Spoilers Vs. Airbrakes

Mon Jun 03, 2002 3:00 am

usually, Airbrakes are there to make drag and slow the airplane so they dont have to reduce power while descending, which prevents icing problems. Spoiers are lift-killers, used mainly on the landing roll. They slow down the airplane and make it "stick to the ground" more.

Hope this helps
Magic  Yeah sure
 
Sonic99
Posts: 625
Joined: Sun Jun 03, 2001 8:39 am

RE: Spoilers Vs. Airbrakes

Thu Jun 06, 2002 1:38 am



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Photo © Stephan Curkowskyj



Spoilers, flaps, airbrakes.

Sonic99
 
sllevin
Posts: 3312
Joined: Wed Jan 30, 2002 1:57 pm

RE: Spoilers Vs. Airbrakes

Thu Jun 06, 2002 4:01 am

Speedbrakes are devices like on the Fokker that only create drag by extending into the airstream.

Spoilers cause a wing to dump lift, therefor requiring a greater AOA for the same amount of lift, thereby creating drag. But they are also used, as mentioned for things like roll control.

I didn't realize that F100's had TR's -- on my two flights in them TR's weren't used.

Steve
 
Fokker Lover
Posts: 523
Joined: Fri May 10, 2002 10:05 am

RE: Spoilers Vs. Airbrakes

Thu Jun 06, 2002 11:46 pm

Sonic99
In your picture I see.... Lift dumpers deployed, flaps at 42 degrees, thrust reversers deployed, and speed brake closed. I also noticed that the "band aid" repair above the emergency exits has not been installed yet. The the thrust reverser mod to lengthen the finger stops has been completed, and the red beacon is installed on top of the vertical stab (panel 339AT) The USAir beacons are installed on the top of the mid fuselage. The T/R's were causing too much wear and tear on the tail so longer fingers were installed to prevent them from fully deploying. Eventually USAir changed policy when deploying the buckets power could only be pulled during an emergency stop. They could still open the buckets during landing but only at idle. I don't know if AA still powers back from the gate, but they were causing more damage than we were.
10,000 years ago we would have eaten you. Today, we drag you along and allow you to pollute the gene pool.

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