Consider also that a prop is an e=ADssential
non-redundant monolithic structure, which if aluminum, is ma=ADde of a

material (2024-T3) that has good tensile, but mediocre fract=ADure
toughness properties.

Lightplane props are universally made of 2025T6, according to my
Sensenich prop manual. 2024T3 is used mostly for aircraft skins. The
2025 lacks the manganese and magnesium of the 2024, but has silicon
that the 2024 doesn't have. The yield and tensile strengths of 2025T6
are a bit less than 2024T3, but the metal isn't as hard, likely
reducing crack tendencies somewhat. The copper is still present, making
the prop corrosion-prone, and in Canada, at least, we have to remove
the prop, strip it and inspect it for corrosion at least every five
years. Corrosion pits can be as bad as nicks for starting cracks.
Dan