Oops I missed the note about being set to 0 deg incidence. The original design called for significantly higher Angle of attack than 0 (relative to the C/L or roughly speaking, the middle longeron).
Not knowing for sure how yours is built etc I cannot state that this is a contributing issue...
Gday Alby
Im currently building a full scale Dva in NSW and have a solid pile of data for the full size machine.
What are your angles of incidence for the wing and tailplane set up to?
The wood and fabric horizontal stabs should be angled 1.5 deg above the C/L at the forward attachment point...
