The straight edged, lozenge shaped horizontal tail was mounted on the fuselage centre line; the fin and radiator but this was replaced with a transversely mounted, circular cross-section ventral radiator and the engine cowling revised.
The straight edged, cropped lozenge shaped horizontal tail was mounted on the fuselage centre line; the fin and rudder were also straight edged. The aircraft as first flown had a ring shaped radiator but this was replaced with a transversely mounted, circular cross-section ventral radiator and the engine cowling revised.