I have an Ace Seamaster & in stock form it has a small amount of dihedral. The aircraft has a pylon-mounted engine & the airframe is a high/shoulder wing type. I am toying with the idea of removing the dihedral to enhance inverted aerobatic capability, but I am not quite sure whether this will be beneficial.

With the thrust line well above the center of lift, I am assuming that the effect is somewhat like a conventional low-wing design (ie. needs a small amount of dihedral), However, the center of drag is below the center of lift & the center of mass is close to the center of lift, but slightly below it.

Has anyone actually modified a Seamaster in this manner, or a similar type, & what can I expect from such a change?