Re: Strange 707 at Burbank

Date:         18 Mar 2001 12:06:16 
From:         Matt Weber <mattheww@Qwest.net>
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>So apparently these folks retrofitted the engines on an ol'
>707 to make them comply with the latest regulations.  Why the
>winglets?  No idea.  Maybe the engine changes impacted the
>aircraft's behavior enough that they were warranted?

The winglets reduce the parasitic drag a few per cent.  As long as you have
to tweak the engines and flaps and slat scheduling, for a few dollars more,
you can squeeze few per cent better fuel economy as well.  Many of the
stage III upgrades either reduce engine thrust, or reduce MGTOW, so
reducing fuel burn in flight is one way of recovering the last payload.