Re: Why no wingtips for B777???

Date:         03 Aug 97 02:50:14 
From:         jf mezei <"[non-spam]jfmezei">
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> C. Marin Faure wrote:
> > Winglets are a compromise, used to improve the efficiency of an existing
> > or flawed wing design.  If you have the opportunity to design a wing from
> > scratch and you get it right, as was done with the 777 and the New
> > Generation 737 family, there is no reason to install winglets.  While they

k_ish wrote:
> Also, the efficiency improvement from winglets is only fully realized at
> high altitude sustained cruise.  Although winglets yield an efficiency
> increase at any altitude/airspeed, this improvement does not offset the
> weight and manufacturing penalties C. Marin describes.

What about the other extreme of the 747-400, the Canadair Regional jet
(flying skidoo).  It is designed for short hops, yet has winglets. Is
this because Canadair didn't build the wing from scratch, using designs
from its Challenger programme ?

Or are the winglets on the CRJ purely for manoeuvrability/smooth ride
purposes ?
(do they make a difference ?)