I have recently heard some friends of mine talking about the "Quiet Wing" modification for 737-400's, vice using a winglet mod. I don't know know of any approved winglet mods for a -400, but I could be wrong. Do any of you know anything about the quiet wing? Good, bad, or indifferent. I would love to hear from those that have the -400 experience to see if this application would be good for any of the -400 variants (pax/combi/freighter). I know my pilot friends are a little skeptical, about it. Their biggest argument point is that if it was such a good thing, operators like Alaska, US Airways, or Southwest would be all over it, but to their knowledge each of them are trying to suck the flaps up in tighter to get the out of the air stream vice putting them out further into it. Would love to see what your thoughts and comments are on this.
Here is a link to the mod in question: