I designed a 1/4 scale model of the D VIII. My observations:
Engine mounted at zero zero to the fuselage datum line.
Scale offset used in the verticle stabilizer as per full scale.
Both wing and horizontal stabilizer set at a positive angle of attack to the
fuselage datum line there by creating a tail high attitude and ergo down
thrust. I believe the wing is set a +3 and the stab at +4 but let me confirm
that.
Tally Ho
Guy