Bearclaw Figure

Bearclaw figure, also known as hazelfichte in German-speaking regions, refers to a distinct rippling or shimmering pattern in the grain of Sitka Spruce.

Structural Integrity and Density

Bearclaw occurs when the longitudinal fibers of the tree undergo a structural shift, creating asymmetrical indentations in the growth rings.

Stiffness: These indentations indicate a higher degree of cross-grain stiffness.
Density: Bearclaw specimens are typically found in older, slower-growing trees, resulting in wood that is denser than average Sitka Spruce.

Acoustic Properties

A soundboard must maximize its strength-to-weight ratio to vibrate efficiently while under the tension of steel strings.

Velocity of Sound: Increased stiffness allows vibrations to travel through the soundboard at a higher velocity.
Harmonic Complexity: The structural irregularities in the grain break up standing waves, often resulting in a richer, more complex harmonic profile.
Headroom: Due to the inherent density, bearclaw tops can be driven harder before the sound "breaks up," offering greater dynamic range.

Master Grade Classification

In the context of Master Grade selection, bearclaw is valued for both its physical performance and its scarcity.

Rarity: This figure is found in less than 5% of the Sitka Spruce population.
Longevity: Because it originates in old-growth timber, the wood has reached peak cellular stability, reducing the likelihood of warping over time.

Working the Master Grade Top

Because Master Grade Bearclaw is essentially a "stiffness upgrade" due to its interrupted grain, you must adjust your standard build parameters:

Thicknessing: Bearclaw is typically denser and stiffer than straight-grained Sitka. You may find that you can take the top 0.1 mm to 0.2 mm thinner than your standard spec while maintaining the same target deflection.
Run-out Management: Bearclaw figure involves localized grain "dips." Be extremely careful when using a hand plane or a scraper; these areas are prone to tear-out. It is often safer to do final thicknessing with a drum sander or very light passes with a cabinet scraper.
Tap Tone: You will likely notice a higher "glassy" ring. Because of the cross-grain stiffness provided by the "claws," the lateral vibrations are often more pronounced.