Re: 747 wing flexibility

Date:         10 Sep 98 02:08:15 
From:         k_ish <kenish@ix.netcom.com>
Organization: ICGNetcom
References:   1
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MARKWRK wrote:
> I heard once that a 747 wing is designed to flex in turbulence up to 6
> feet at the tip (3 feet up, 3 feet down). Does anyone know if this is
> correct and where I might find the facts on this. I checked the Boeing
> site and was unable to find anything.

A wing was put into a test jig and bent to failure in the upward
direction.  IIRC, the deflection was something like 25 feet.  It's routine
to see a 747 wing deflect +/- 5 feet in normal turbulence.  Also, you can
watch the wingtips slowly sag when parked at the gate as the plane is
refueled; again about 5 feet.

Ken Ishiguro