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Stress testing wings

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deskpilot

Well-Known Member
Joined
Jun 30, 2009
Messages
1,132
Location
Morphett Vale, South Australia. Just south of Adel
I have a couple of questions regarding the testing of wings to establish positive and negative 'g' limits. I understand that the normal thing is to load the top surface for negative limits and then turn the plane/wing over and load the top(underside) for positive limit. This seems a lot of work particularly loading and unloading and maintaining equal loads on each wing. Now I might be missing something but why not load as per this sketch

Wing strength testing.jpg then raise or lower the central cradle to stress the wing either positively or negatively.

2nd question. Test loads are normally spread along the wing span, using either a static load or a wiffle tree system. What's the difference if the load was applied only to the wing tips with the fuselage held firm?
 
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