Forge Aluminum
Why is steel wool impregnated into aluminum props?
Why do they stuff forged aluminum tubes with steel wool prior to forming them into propeller blades? Who came up with this idea?
Nope... Try again. Though it does add strength the added weight overshadows any gains in strength that was accomplished by adding steel wool.
The material used is lead wool. It is used for balancing the blades. The material is stuffed into the holes in the blades after they are manufactured, and it has nothing to do with strength. During overhaul t is removed, the blades inspected by non-destructive methods ((liquid penetrant) and lead wool is again tamped into the bores until the weights are within tolerances.
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