Re: 727 rudder

From:         Patrick Ware <pware@whytel.com>
Organization: SmartWare
Date:         16 Feb 96 04:33:27 
References:   1
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Kathryn Hazlett wrote:
>
> Why does the 727 have a two piece rudder?
>
> What are the advantages or disadvantages of a two piece rudder?

Kathryn,
The purpose of two rudders is twofold. First, it gives redundancy and a
backup for flight controls and the hydraulic systems which control these
rudders. Second, is provides a large surface area for low speed flight
regimes where yaw control must be maintained during engine failure, and
during cruise flight only one rudder is needed for yaw damper
operations. Modern jet liners use only one rudder these days because
maintenance and inspection costs of the 727 rudder system were
expensive.

Patrick Ware
pware@whytel.com