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Old 06-03-2008 | 03:17 PM
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We were sitting in the Q in-line in EWR and were wondering what the 4 Yellow strakes under the tip of each wing are for on the ERJ?

Also on most jets, just happened we saw on a 757, what is the door that opens just under the captains side rear elevator, is it a back up air vent for the APU? I am pretty sure the one on the FOs side above the elevator is.

thanks ! If you got any Q400 questions Ill try to answer in return !
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Old 06-03-2008 | 03:39 PM
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Originally Posted by sinsilvia666
Also on most jets, just happened we saw on a 757, what is the door that opens just under the captains side rear elevator, is it a back up air vent for the APU? I am pretty sure the one on the FOs side above the elevator is.
That is part of the pressurization system. The one on the FOs side is the APU inlet door.
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Old 06-03-2008 | 04:17 PM
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ERJ = "Vortilons"

Create an aerodynamic fence at lower airspeeds/high AOA to help prevent spanwise flow.
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Old 06-04-2008 | 12:22 PM
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As what Swaayze said. In other words, the vortilons act as fancy vortex generators to re-energize and re-direct the airflow over the ailerons at low speeds high AOA.

Side note: the ERJ has only ailerons for roll control, the spoilers are purely for speed brakes and ground spoilers.
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Old 06-04-2008 | 03:40 PM
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Originally Posted by swaayze
ERJ = "Vortilons"

Create an aerodynamic fence at lower airspeeds/high AOA to help prevent spanwise flow.
At XJT we have an alternate name. The Beaumont rake.
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Old 06-04-2008 | 06:15 PM
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Originally Posted by sinsilvia666
were wondering what the 4 Yellow strakes under the tip of each wing are for on the ERJ?!
They're missile pods for war time.
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Old 06-05-2008 | 04:46 AM
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Originally Posted by sinsilvia666

Also on most jets, just happened we saw on a 757, what is the door that opens just under the captains side rear elevator, is it a back up air vent for the APU? I am pretty sure the one on the FOs side above the elevator is.
Possibly they are the outflow valve (lower left aft side of the fuselage) and the APU intake (upper right extreme aft)
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Old 06-06-2008 | 04:36 PM
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thanks for the answers, yeah i figured they had something to do with vortex generator-ish traits, but looked way different - interesting !
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Old 06-22-2008 | 06:28 AM
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Originally Posted by dojetdriver
At XJT we have an alternate name. The Beaumont rake.
hahah classic
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Old 06-22-2008 | 03:35 PM
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when the Q400 takes the runway, how come the spoilers always go up until they start rolling??
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