Interesting Probes on A380

jwp_145

jwp_145

GhostRider in the Sky
In the picture below this Qantas A380 has the typical AoA probes, but it appears to also have sideslip detecting probes also... I'm sure these feed into the AirData Computer, but what do you think is the result of their sensings?

1790616.jpg
 
No idea about the data coming in, but that picture gives you a great perspective of just how big that thing is compared to a person.
 
Yup, they are sideslip sensors. On most other aircraft the sideslip values are derived from the accelerometers and aircraft attitude. It is novel (and good!) to have dedicated sensors. The 777 has a couple of sensors on the vertical stab to measure the pressure differential across the surface, but I suspect that is more about yaw damping than sideslip.

On Airbii the sideslip is displayed below the roll index on the PFD (like a turn coordinator) and the value is used by the FAC to generate a target sideslip during engine-out stuff to get the best climb performance with neutral ailerons.
 
Note the lack of Body Gear steering on the body gear.

Goodyear stock went up 10% due to the anticipated increase in sales. ;)
 
Fun fact: On the last row of wheels on the six-wheel trucks of the body gear, brakes are an option. :)
 
ComplexHiAv8r said:
What are the vents for on the bottom? Magneto-hydrodynamic propulsion?
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My SWAG is air inlets for the Air Cycle Machines (aka Packs). If you look in between the body gear, it appears that the exhaust for the packs is there.

As the jet climbs into colder air, the doors will close limiting the air coming in to the system (and thus drag).
 
Yaw probes feed into the ADC and are probably used for AOA limiting (stall prevention/mitigation)

The mighty Bro (EMB120) has a yaw sensor on the fuselage crown overhead the MCD and it's use for the stall warning system.

I'm pretty certain the Embrear E-Jets also have the Yaw sensor for AOA limiting

Cheers
George
 
ozziecat35 said:
No idea about the data coming in, but that picture gives you a great perspective of just how big that thing is compared to a person.
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That is why I originally inspected the pic so closely! I think it is an amazing picture. I would like to see this bird in person!
 
Thanks for that picture!

I would wager an "edumacated" guess that they provide another input, beyond the AOA sensors, for the stall warning system.

Ooorrrrr they might be a new fangled, fancy, European, touch free, laser windshield wiper system. The government has been using them for decades, but the powerful, rubber windshield wiper industry has been keeping them off the automotive and aircraft markets by using threats and unsavory strong arm tactics. ;) :D
 
Lee D said:
Thanks for that picture!

I would wager an "edumacated" guess that they provide another input, beyond the AOA sensors, for the stall warning system.

Ooorrrrr they might be a new fangled, fancy, European, touch free, laser windshield wiper system. The government has been using them for decades, but the powerful, rubber windshield wiper industry has been keeping them off the automotive and aircraft markets by using threats and unsavory strong arm tactics. ;) :D
Click to expand...
:yup:
 
Pépé le Pilot said:
It's incredible. Makes a 777 look like an A319. It's THAT big.
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I have seen them next to 74s in Singapore, and Qantas A380s lined up in Heathrow. They are huge, but they look short. It looks as if Airbus went conservative with length, knowing that they could stretch it and sell more of another model later on.
 
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