Re: Why no wingtips for B777???

Date:         29 Aug 97 00:53:42 
From:         luisma@spainmail.com (Luis Manuel Perez Llera)
Organization: Unisource Espana NEWS SERVER
References:   1 2 3 4 5 6
Followups:    1
Next article
View raw article
  or MIME structure

El día 08 Aug 97 05:41:16 , David Lednicer <dave@amiwest.com> dijo:

>k_ish wrote:
>> Winglets have nothing to do with handling or ride characteristics.
>
>	Not true - winglets add to the effect of dihedral of a wing.  I
>know of at least one airplane where winglets were added to increase
>dihedral, with the drag improvement being only a secondary consideration.

IMHO, winglets are introduced for drag reduction purposes. You have to
note that they were first developed in the 70s fuel crisis. No doubt they
have also some effects on the A/C's lateral stability.

BTW, does anybody know if it exists a general stablished theory to design
both winglets and vortices generators? AFAIK, they are only a
trial-and-error matter.