Engine Cowl Fun
 

Hi Folks,
On all modern passenger jets there is either one or two fins on the engine cowling. They are on the 737, 747-8, 777, 787, A320 series, A330/340-5/600, A380. What are they for, how do they work and what are the advantages of having them there? What would happen if they weren't. At high angles of attack in moist weather there is a generated vortex off them over the wing. Can someone link me to a site that explains their use please?
Cheers...

Search this site for "Chines", quite a few threads about it.

Basically they are there to generate a high energy vortex at landing angle of attack to maintain flow over the wing near the engine. Typical stall speed reduction of 5 knots or so.

Edit: here you go:

http://www.pprune.org/tech-log/33944...e-cowling.html