That old Contender was an extremely low aspect ratio setup - and was pretty stable .
The rudder placement was above thrust line . Adverse yaw wasn't all that bad.
On our low aspect ratio stuf (3-1 aprox), dihedral for stability is not needed . pretty much true for any really low aspect ratio setup
On my 3D stuff- Wing is closer to thrust line and rudder area is about 2/3 above it
back when I had the Contender (1970), I also tried doing a 40 Quickey type -with a flat wing.
pretty lousy on stability when trying any rudder corrections . lots of adverse yaw.