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Purrpose of short struts

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stanislavz

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Aug 21, 2016
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I try to reinwent excel files for primary wing calculations, and explain it for myself. All was ok for strut less wing till i did stuck to draw proper spar cap load, if struts are placed not in middle of wing lift point.

But not pk for different position. As an.example. 10m wingspan, square load curve of 300kg per each meter. If we place struts at 2.5m. Position - load of spar will be zero at wing tip and wing root. strut transmit all load.

If we put strut at 2m from wing tip - strut transmit 1200kg of force, 300 kg - directly via wing root.

But if we put strut at 1 meter from wing root - how do all curves do look ? Found some old glider with even bigger ratio of strut to wingspan. What is the purpose of struts in it ? PIK-5 - Wikipedia
 
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