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Old 09-13-2019, 11:06 PM
  #80  
Alex Voicu
 
Join Date: Aug 2006
Location: Trollhattan, Sweden
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Thank you for the image and details Claude. Most of the strength comes from the balsa sheeting anyway; for example a wing made of foam and balsa doesn't have any spars. If we isolate the foam core its strength is almost 0 against the bending forces.