Winglets

mohsin habib · Post by **mohsin habib** » Sun Jan 21, 2007 8:19 am

How many of PIA aircrafts have the winglets ? i guess only few of PIA's a-310 have winglets. can anyone tell me the exact figure??

why dont PIA fix all their fleet with winglets since they save considerable amount of fuel ?

BOEING777 · Post by **BOEING777** » Sun Jan 21, 2007 8:54 am

A310's have wingtip fences, not winglets.

No PK airplane has winglets.

Abbas Ali · Post by **Abbas Ali** » Sun Jan 21, 2007 9:04 am

PIA's Boeing 777-240LRs and Boeing 777-340ERs have raked wingtips to improve fuel economy.

See following link for more info about Winglet, Wingtip Fence, Raked Wingtip and other wingtip devices:

Link: Wingtip Devices - Wikipedia

mohsin habib · Post by **mohsin habib** » Sun Jan 21, 2007 10:49 am

Abbas Ali wrote:PIA's Boeing 777-240LRs and Boeing 777-340ERs have raked wingtips to improve fuel economy.

See following link for more info about Winglet, Wingtip Fence, Raked Wingtip and other wingtip devices:

Link: Wingtip Devices - Wikipedia

Winglet, Wingtip Fence, Raked Wingtip
do they all serve exactly the same purpose ??

BOEING777 · Post by **BOEING777** » Sun Jan 21, 2007 12:18 pm

Yep, to reduce wake votices, lower fuel consumption and increase speed/range.

DEZI · Post by **DEZI** » Tue Jan 23, 2007 7:29 am

BOEING777 wrote:Yep, to reduce wake votices, lower fuel consumption and increase speed/range.

An ideal modification for PIA's B747s!!

BOEING777 · Post by **BOEING777** » Tue Jan 23, 2007 3:24 pm

Not really.

The 747-300 is old school tech. In fact, so is the 747-400.

DEZI · Post by **DEZI** » Tue Jan 23, 2007 3:26 pm

BOEING777 wrote:Not really.

The 747-300 is old school tech. In fact, so is the 747-400.

Then why do pilots fly the Cessnas' for their ratings??

BOEING777 · Post by **BOEING777** » Tue Jan 23, 2007 5:04 pm

What on Earth has that got to do with winglets?

ConnieMan · Post by **ConnieMan** » Wed Jan 24, 2007 12:13 am

Blended winglets are designed for narrow bodies and widebodies B747s also, i have seen test shots of 22' tall blended wingtips on test 747-100/200 and yes it dose save 5% on fuel consumption on long haul flights but none of the airlines ever order these for 747s, yet new NG 737s are built with these and some airlines have installed these in smaller size on B757s compaired to B747s!. BTW B744 does come with winglits except for D version, that is how its easily identified as 400 series by most regular people.

Now newer raked wingtips are more superior then blended one on wide bodies, new B748 is designed with them.

BOEING777 · Post by **BOEING777** » Wed Jan 24, 2007 5:17 am

I know of the blended winglets you refer to for the 747-100/200. Its the APB designed ones- and they DONT save 5% fuel.

If they did, like the 757's that have the retrofit winglets, so would these 747's.

The fact of the matter is, tha apart from the 747-400, there are no ad hoc winglets.

ConnieMan · Post by **ConnieMan** » Wed Jan 24, 2007 6:53 am

BOEING777 wrote:I know of the blended winglets you refer to for the 747-100/200. Its the APB designed ones- and the DONT save 5% fuel.

Hey don't quote wrong on me on this, i posted what i have read about these when they were first released. Do you know fuel saving with these type?

BOEING777 · Post by **BOEING777** » Wed Jan 24, 2007 3:01 pm

Yes, and its nowhere near 3% let alone 5%.

Lest we forget the additional weight the winglets add- it add's up to greater inefficiency.