How does noble fir's shear strength compare to that of spruce?

Noble fir typically exhibits a lower shear strength when compared to spruce. Shear strength is a critical mechanical property in aviation and structural applications since it determines how well the material can withstand forces that tend to cause sliding between the layers of the material.

In the context of timber, spruce is known for its superior strength characteristics, including shear strength. This makes spruce a preferred choice in many aviation applications where mechanical integrity and resistance to structural failure are paramount.

While noble fir has other beneficial properties, such as being lightweight and having good dimensional stability, its shear properties do not match those of spruce. This understanding of wood properties is significant in selecting materials for aircraft structures where performance and safety are crucial concerns.