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RE: real life seismic house test

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OT,  but possibly intersting to you, I helped document the restoration of
this DH-4.

> As far as deHavilland (designer of the Comet I) there were actually 3
> crashes relating to fatigue cracking around the windows. The explosive
> decompression occurred when the cracks reached a critical size
> according to the principles of fracture mechanics. At the time fracture
> mechanics wasn't commonly considered in design--people still thought
> fatigue occurred when metal 'crystallized,' and that local yielding
> would mitigate stress concentration. Like with the Liberty ship
> fractures a decade earlier and the moment connections that broke during
> Northridge. de Havilland didn't exactly quit making airplanes. The
> company was bought by Hawker-Siddley and eventually incorporated into
> British Aerospace. The Canadian and Australian subsidiaries were bought
> by Bombardier and Boeing. Still plenty of de Havilland designs flying
> only under the new brands. If you've ever had the good fortune to get
> close to a de Havilland Mosquito at an air show, they really look
> timeless, like a Duesenberg automobile or the Chrysler building.
> >
> Christopher Wright P.E. |"They couldn't hit an elephant at
> chrisw(--nospam--at)   | this distance" (last words of Gen.
> .......................................| John Sedgwick, Spotsylvania
> 1864)

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