I never turned any sycamore into lumber, but I think it is rather prone to checking and splitting. It's definitely wet, heavy wood when green.
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Color/Appearance: Similar to maple, the wood of Sycamore trees is predominantly comprised of the sapwood, with some darker heartwood streaks also found in most boards. (Though it is not uncommon to also see entire boards of heartwood too.) The sapwood is white to light tan, while the heartwood is a darker reddish brown. Sycamore also has very distinct
ray flecks present on
quartersawn surfaces—giving it a freckled appearance—and it is sometimes even called “Lacewood.”
Rot Resistance: Sycamore is rated as non-durable to perishable regarding decay resistance, and is susceptible to insect attack.
https://www.wood-database.com/sycamore/