In which aspect does Douglas fir outperform Sitka spruce?

Douglas fir excels in strength when compared to Sitka spruce. This characteristic is crucial in aviation applications because strong materials can better withstand the loads and stresses experienced during flight. The superior strength of Douglas fir allows it to support aircraft structures effectively, making it a preferred choice in areas where load-bearing capabilities are essential.

While weight is also an important factor, both Douglas fir and Sitka spruce are relatively lightweight, with the latter generally being preferred for very lightweight applications. Regarding cost, the two woods may vary based on regional availability and demand, but strength is a more critical performance factor in aviation. Corrosion resistance does not apply to these woods since they are both susceptible to environmental degradation if not properly treated, making strength the standout characteristic that gives Douglas fir an advantage in aviation contexts.