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Old 28th Mar 2017, 02:43
  #37 (permalink)  
Pilot DAR
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Join Date: Aug 2006
Location: Ontario, Canada
Age: 63
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When I worked for deHavilland in the early '80's, during the infancy of the Dash 8, it was designed with the aid of rather basic computer assistance. I think that even though computers were involved, there was a lot of old school slide rule calculations which really made the plane.

Following the fatigue test program of the "iron bird" airframe, the wing was to be pulled to failure. I recall that they installed the longest stroke hydraulic pull cylinder they could find - 8 feet of stroke. They pulled up on the wingtip with it (with the wing root very firmly held in the frame). The cylinder used up all 8 feet of stroke, yet the wing did not break. I don't recall if it "yielded", but had that been done in flight, the aircraft would still have been whole. Imagine a Dash 8 wingtip displaced 8 feet up, and not broken!
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