Hi Daniel.Let me inform you that this construction was made in 1999.From what I remember and as you can see in photos 6,11,15 I did not use any stooges in the joint of wings and fuselage,which gives us the right dihedral angle.Not to mention that the application of Hasegawa was excellent.This model participated in the nationwide competition. I'm not an expert.However, the 3 judges told me nothing about the dihedral.I guess it's a mistake of the Hasegawa or maybe that’s the way it looks in the photos.Thank you for the observation.