Methods
The joint is formed by cutting opposing tapered ends on each member which are then fitted together. When working with wood, this gives better long grain to long grain gluing surface, which yields a stronger joint than would be achieved with a simple butt joint. The tapers are generally cut at an angle between 1:8 to 1:10. The ends of a plain scarf are feathered to a fine point which aids in the obscuring of the joint in the finished work, while in other forms of scarf the ends are frequently cut to a blunt "nib" which engages a matching shoulder in the mating piece.
Where scarfed joints are used in the restoration of vintage aircraft most developed countries will only issue an airworthyness certificate if all such joints have used an angle no less than 1:8.
Read more about this topic: Scarf Joint
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