Dear Stick.
Are you trying to pull someone's leg? Forward sweep plus anhedral yet ! Believe you are serious?
I doubt if this combo has ever been tried. Forward sweep yes,
Anhedral yes but in combo ???
I have no way of knowing if you understand what you are going
to use or not. So will summarize briefly>
Wing sweep: it detracts a bit from lift. it reacts a bit like hedral,
tending to right a craft upright or inverted.
Sweep back is primarily used to delay compressability when approaching Mach 1.
Many years agoit was used on rubber powered models supposedly so less dihedral would be required
Sweep forward reacts similiar and it is said to be more efficent.
Dihedral and anhedral react in a similiar fashion. When the craft
turns laterally on the longitudinal axsis one wing panel effectively
becomes longer and closer to horizontal while the other panel
effectively becomes shorter with an increase in hedral.
The longer panel has a lift increase tending to right the craft.
When a dihedraled craft flys inverted it has anhedral. So when a
anhedraled craft flys inverted it has dihedral.
There could be different control reactions between the concepts
but that is beyond the scope of this message
Hope this helps, good luck!

Hal [email protected]