Prop question- Cup

[PORT]

I have a Drag4 prop that has been modified to have a "little extra cup". I know typically it is like adding pitch, it drops rpms and slip decreases.
But what does it do to the prop's characteristics for bow lift? less bow lift?

[staylor]

Usually on a prop of this type the person that added the cup added it at the blade tips- this increases the props rake angle which tends to add bow lift. If the cup was added to the back edge of the blade instead of the tip it will add some pitch but not affect lift.
Doug