Hi Ptulmer,
I think the term I was after was polyhedral rather than dihederal!
I read somewhere that there were a few rules of thumb regarding dihedral.
After posting my question I found one reference that the minimum dihedral angle (angle 1 in my pic) for a low winger with v-dihedral without ailerons was 7 degrees, so on my model, about 2 inches under each tip if it had v-dihederal. So angle 2 would be approx 10 degrees for my wing.
Work really detracts from clear aeromodelling thoughts
