Why winglets

[GVFlyer]

Winglets

Winglets not only reduce wingtip vortices, but also increase the effective span of the wing by approximately 1/3 the height of the winglet. In the case of the GV and derivitives, they also provide a forward thrust vector. Gulfstreams may be MEL'd to fly without a winglet, but range must be reduced by 7%.

Besides that, they look cool and marketing loves them.

The winglets for the BBJ were developed by Joe Clark and Aviation Partners, the same group of former Boeing engineers that got their start doing aftermarket winglets for the G-II.

GV

 

[Hugh Jorgan]

Why not winglets?

 

[banned username 2]

Re: Winglets

Besides that, they look cool and marketing loves them.

The G-V's winglets are much nicer looking than the G-IV...

 

[av8orboy]

winglets

Folding tips???? Just a guess..

 

[crudeoilpilot]

Winglets have also been coined as Flight Engineer tombstones on the (re-engineered) wide-body aircraft. Personally speaking, I dont care for that one.

 

[bafanguy]

mar,

Got the PM...thx. RPM/Kfactor=BHP/BMEP. Don't tell 'em here what it means...knowledge is power.

 

[TonyC]

mar,

Got the PM...thx. RMP/Kfactor=BHP/BMEP. Don't tell 'em here what it means...knowledge is power.

Did you mean RPM?

 

[bafanguy]

DARN !!! Messed up my own joke...story of my life...

 

[enigma]

I have an interview coming up in the near future and a friend of mine was asked the following question:

Why doesn't the 777 have winglets.


It was after he was asked what the winglets do, and what the purpose was.

His answer to the first question was: To safe fuel. Installed on modern aircraft. (and a few other things).Then the interviewer said: "Why not on a 777 then".

Any inputs would be greatly appreciated

Frix, winglets are a great way to enhance the performance of an existing wing design. They allow the aerodynamicist to gain the span effects of a longer wing, without gaining the root bending effects of a longer wing. In other words, if an engineer needs to upgrade his airplanes performance with wingspan, winglets let him do so without having to change the basic wing structure. He can't just add span, that would demand increased structure and the attendent weight.

The 777, as well as the CitationX, and Falcons don't need winglets because their wings were engineered properly to begin with. Please don't misunderstand, there are numerous examples of properly engineered wings getting winglets added later in life, but those applications exist where the wing is being asked to work harder than it was originally designed to work. For example, the Lear Longhorn wing is just the original Lear 23 wing with some aero mods and the tipsails (Lear name for winglets). Lear added the tipsails to a wing originally designed to lift around 15000 pounds as a way to get more work. Their redesign worked, because the Longhorn wing was eventually fitted to the 23000 pound Lear 60.

There are other valid reasons to design the wing for winglets in the beginning. One reason would be room, the wing can be made shorter with the winglet, allowing for easier hangar-ability, better ground manuverability, etc.

The best way to make the point is to look at the wings of the most efficient/highest performing aircraft. They generally don't have winglets. Examples would be the 777, the aforementioned Falcons, CitationX, etc.

regards,
enigma

 

[banned username 2]

Re: Re: Why winglets

The 777, as well as the CitationX, and Falcons don't need winglets because their wings were engineered properly to begin with.

Hehehehe... This can only mean ONE thing about the Gulfstream wings!

(Running to duck for cover before GVFlyer arrives on scene!)

 

[Frix]

Winglets

Wow,
You look away from your PC for a few days. Thanks a bunch for the inputs. Even though not all of the replies were about winglets, I still enjoyed reading them.

Fly safe. (with or without those darn things)

 

[CaSyndrm]

Cause they look cool and chicks dig them...

 

[ThomasMore]

> Max. Dem X/W

Bad crosswind technique...

 

[TopGun-MAV]

depends on the design of th aircraft. they are there for stablilty and also they reduce the flow of high pressude air to the low pressure area.

just my 2 cents

 

[Dizel8]

I meant to ask you, what is "Lauch", a new austrian lite beer or....?