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Winglets Question  
User currently offlineMorecy From United States of America, joined May 2000, 216 posts, RR: 0
Posted (12 years 5 months 4 days 16 hours ago) and read 831 times:

OK, so when the 747-400 came out they outfitted the wings with winglets in order to improve performance. My question is why didn't they retrofit -100, -200 or
-300 versions with these same winglets?

Thanks !!!

7 replies: All unread, jump to last
 
User currently offlineMorecy From United States of America, joined May 2000, 216 posts, RR: 0
Reply 1, posted (12 years 5 months 4 days 16 hours ago) and read 815 times:

... and why wasn't the 777 outfitted with winglets?

User currently offlineTWAMD-80 From United States of America, joined Oct 2001, 1006 posts, RR: 4
Reply 2, posted (12 years 5 months 4 days 14 hours ago) and read 807 times:

My guess as to why the earlier 747 models (-100, -200, and -300) aren't retrofitted with winglets would be the fact that they are getting old. It would likely be a waste of time and money to fit an older 747 with winglets when it may be ritired in a couple of years. I'm sure that it could be done if the owner of the 747 was willing to pay the amount for it to be retrofitted.
I'm not sure about your second question: why the 777 wasn't fitted with winglets.

TWAMD-80



Two A-4's, left ten o'clock level continue left turn!
User currently offlineYeeha From Australia, joined Apr 2001, 70 posts, RR: 0
Reply 3, posted (12 years 5 months 4 days 12 hours ago) and read 785 times:

The reason as to why 777 is not fitted with winglet is because,

777 uses the most aerodynamically efficient wing shape ever developed for subsonic commercial airliner. Therefore it climbs quickly and can cruise at higher levels and higher speeds. The wing also effective at hot and high airports where full passenger payloads can be carried.


User currently offlineBa777-236 From Canada, joined Oct 2001, 673 posts, RR: 4
Reply 4, posted (12 years 5 months 4 days 12 hours ago) and read 781 times:

"TWAMD-80" I do not think that all the 747 classics are to old for winglets as some 727's are equipped with winglets
Click for large version
Click here for full size photo!

Photo © Brian Wilkes


The reason might be that winglets big enough for a 747 might be to heavy for the older 747's.

But that's just my opinion,
ba777-236 Smile/happy/getting dizzy



I like British Airways! I'm not sure why, but I do! ;-)
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 5, posted (12 years 5 months 4 days 10 hours ago) and read 769 times:

The reason for the 777 not having winglets is that it is better to simply use the same weight to make a longer wing in a new design. Airliners are retrofitted with winglets since extending the wings would mean that the entire wing had to be structurally reinforced. I e, you'd have to rebuild the entire wing.

As for the older 747s... Adding winglets costs money. The reduction in fuel over the remaining life of the airliners has to pay for this. They just aren't planning to keep the older 747s in the air long enough for winglets to pay off. Besides, most of them are already paid off and are generating pure revenue. They can get rid of them anytime they want and not have a net loss. They might be reluctant to tie themselves to these old airframes for additional years.

Yehaa,
was that quoted or just paraphrased from the Boeing ads?  Big grin

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineBlatantEcho From United States of America, joined Sep 2000, 1903 posts, RR: 1
Reply 6, posted (12 years 5 months 4 days 10 hours ago) and read 761 times:

Aviation Partners, (supplier of 737NG winglets) is currently testing some 10ft tall winglets for the 747-200. This was going on some time ago, I do not know where the project stands now.

Winglets are also being planned/tested for the 737-700, and the 737-300/400??

As for the 777, as everyone pointed out, the wing has so much efficency built in, no winglets are needed. The 773ER and 772LR will have raked wingtips though, in the same fashion as the 764ER.



They're not handing trophies out today
User currently offlineTWAMD-80 From United States of America, joined Oct 2001, 1006 posts, RR: 4
Reply 7, posted (12 years 5 months 3 days 20 hours ago) and read 736 times:


"BA777-236" - In my first post I never said that the older 747 versions were too old to be fitted with winglets. I said that it wouldn't be economical for the older planes to be fitted with winglets. It would cost time and money to retrofit an airplane with them. This move would be a waste if the airplane is not far off from retirement. Yes, it could be done just as long as the airline or owner of the 747 is willing to pay for it.  Smile

TWAMD-80



Two A-4's, left ten o'clock level continue left turn!
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