Nobody likes to be found out, not even one who has made ruthless confession a part of his profession. Any autobiographer, therefore, at least between the lines, spars with his reader and potential judge. Erik Erikson
Although it is used for spars in modern times there is as yet no evidence the Vikings used spruce for masts. Source: Internet
Also, the structural forces in the spars of a biplane wing tend to be lower, so the wing can use less material to obtain the same overall strength and is therefore much lighter. Source: Internet
Composite clippers had the strength of iron spars with wooden hulls, and copper sheathing could be added to prevent the fouling that occurred on iron hulls. Source: Internet
Cordage is attached to the spars and sometimes the sails by systems of metal pulleys and clips. Source: Internet
Dancer & Hearne processed much of the wood from start to finish, receiving timber and transforming it into finished wing spars at their High Wycombe factory. Source: Internet