High Speed Aileron on the 747

Question. What is the high speed aileron for on the 747? What does it do, and where is it located on the fuselage?

Hey!

The high speed aileron on the 747 is one of the two ailerons it has, and is located towards the inner rear section of the wing. Also referred to as a “flaperon”, this inner aileron can be found on all Boeing widebody aircraft. Here you can see it deflected in the downward position on the wing of a 747, and is located in a similar position on all others in their lineup. You can also find a similar design on the McDonnel Douglas widebodies, the DC-10 and MD-11.

The flaperon is essentially just another aileron, which combined with the outer aileron in the more traditional position beyond the outer flaps helps the aircraft roll left or right.

As you may know, Airbus aircraft do not have this concept of a double aileron - and this is down to a variation of aerodynamic principles and design considerations that are dealt with using math that is beyond my head. Instead, Airbus uses a single aileron section in the traditional position that is in of it itself composed of 2-3 aileron flaps (this is how you see the famous aileron dance of the a380).

I hope this answered your question somewhat!

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Thank you for the description. It was very helpful.