Posts: 205
Joined: Fri May 19, 2000 4:07 am

Winglets Question

Thu Feb 21, 2002 11:35 am

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 !!!
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RE: Winglets Question

Thu Feb 21, 2002 11:36 am

... and why wasn't the 777 outfitted with winglets?
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RE: Winglets Question

Thu Feb 21, 2002 1:43 pm

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.

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RE: Winglets Question

Thu Feb 21, 2002 4:04 pm

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.
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RE: Winglets Question

Thu Feb 21, 2002 4:17 pm

"TWAMD-80" I do not think that all the 747 classics are to old for winglets as some 727's are equipped with winglets
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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! ;-)
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RE: Winglets Question

Thu Feb 21, 2002 5:24 pm

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.

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

I thought I was doing good trying to avoid those airport hotels... and look at me now.
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742 W/winglets

Thu Feb 21, 2002 5:30 pm

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.
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RE: Winglets Question

Fri Feb 22, 2002 8:00 am

"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

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