The acute angle between the fuselage and the canard creates interference drag. Air flow moving past the fuselage"tangles" with airflow moving up and over the canard. (corvairq.info/Canard)

Moreover, the spin-rate of the fin system is governed not only by the wind vector and canard deflections, but also by the strength and location of the convected canard vortices, whose induced velocity field differentially loads the tail fins at low angles of attack. (people.nas.nasa.gov)

In addition to its 12-foot-diameter rotor/wing, it has an 8.9-foot-span canard and an 8.1-foot-span horizontal tail. (Boeing)