Compression struts tie the front and rear spars together. They are steel tubes with a flat plate (flange) welded to each end. Bolts through the wood spars and the flanges attach the compression struts to both spars. Large diameter wood washers are used under the bolt heads.
The wing begins to aquire rigidity with the addition of compression struts, like building a lightweight box.
Go to Wing 7: Rib Installation
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