B767 why no winglets

[beerlover]

Can somebody please tell me why B767 do not have winglets, I have an interview soon, and believe this will be one of the questions.

Beerlover

[mary_hinge]

I believe they will have soon, still under development though.

http://www.aviationpartners.com/apboeing.html

[mainwheel]

If it is a legitimate question, then there is really only one answer.

Winglets were not, and still are not, a option from boeing on this aircraft.

It's the same as asking why the 767 dosent have 4 engines? It wasn't designed to!!!

However, why are they asking the question?

[matkat]

Well the B757 and the B737 were never designed for winglets but still some have them, my guess would what is the performance advantages over having them? its maybe that on the B767 wing puting them on may no give a fuel burn advantage, theres also the cost element.

[mary_hinge]

If it is a legitimate question, then there is really only one answer.
Winglets were not, and still are not, a option from boeing on this aircraft.
It's the same as asking why the 767 dosent have 4 engines? It wasn't designed to!!!
However, why are they asking the question?
But they are now:

Blended Winglets for the Boeing Business Jet
The joint venture of Aviation Partners and The Boeing Company created a Blended Winglet Performance Enhancement program that has redefined the Boeing Business Jet, 737-700, 737-800 and 737-300. Launch customer programs are in position for the Boeing 757, 767 and the MD-80. Aviation Partners has the excllusive right to market and sell Blended Winglets to all corporate & VIP owners/operators of Boeing aircraft in service and on the production line.
Up to 6% drag reduction
Built in fuel hedge
Improved takeoff performance
reduced engine maintenance costs
Increased payload-range
Lower airport noise and emmissions
Improved operationalflexibility
dramatically different appearance
Higher airplane residual value

[TURIN]

The -400 already has, they just happen to be horizontal. Strakes I think they are called.

[TheGorrilla]

Because Boeing designed the wing properly in the first place.