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Boeing 737-300 With Blended Winglets  
User currently offlineLN-MOW From United States of America, joined Jan 2000, 1916 posts, RR: 12
Posted (13 years 1 month 3 weeks 3 days 1 hour ago) and read 4889 times:

Yesterday I saw this Aviation Partners B733 when passing Boeing Field:

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Photo © Andreas Mowinckel

It's sporting blended winglets as a part of a program to determine it may be economical to retrofit these older Boeing models (733/734). It is actually not the first 733 with winglets. This was also tested out a couple of years ago.

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As airlines mostly find it too expensive to retrofit 'old' 737NG's with winglets, one must wonder if this really is a feasable project. Nothing seemed to happen with the same project on 747's either.

- I am LN-MOW, and I approve this message.
3 replies: All unread, jump to last
User currently offlineGreg From United Kingdom, joined May 2005, 0 posts, RR: 0
Reply 1, posted (13 years 1 month 3 weeks 3 days ago) and read 4845 times:

It all depends on the price, right?
At one million a set....there won't be many takers.
Lower that to one third...and the payback becomes a bit more realistic.
Also, I imagine it was hard to get more performance out the NG wing (being a current design)...the older wing will be easier to improve on. I would expect fuel burn savings in the 5-6% range.

User currently offlineBlatantEcho From United States of America, joined Sep 2000, 2010 posts, RR: 1
Reply 2, posted (13 years 1 month 3 weeks 2 days 23 hours ago) and read 4809 times:

Greg - Your predicted fuel burn savings for the 737 -300/-400/-500 is roughly that achieved on the NG series with blended winglets.

Just curious what data you are basing your above assumptions on.


They're not handing trophies out today
User currently offlineGreg From United Kingdom, joined May 2005, 0 posts, RR: 0
Reply 3, posted (13 years 1 month 3 weeks 2 days 22 hours ago) and read 4793 times:

Boeing's website has/had a link to Aviation Partners website. This was probably around Feb/March this year. Also, you can check the AW&ST archives...there are two articles on retrofitting...one on the 737 Classics (300/400) and the other on the 747 (200/300).

If I'm not mistaken (and I haven't searched), I think the realistic fuel burn savings on the NG series is 'nearly' 4%--but only achieved at less than maximum take off weight. There is a Boeing statment regarding it...you can search the press releases. I've noticed that Boeing is now 'playing up' the range increase instead of the fuel burn savings---a little peculiar since the NG's have fairly healthy legs for mid size jets.

Have you heard differently? I'd be curious to what you've learned.
Thank you for your reply.

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