Twenty-four aircraft were produced with redesigned front fuselages and dihedral added to the outer wing.
It had no tail-skid, using a single large skid under the front fuselage with a spur extending rearwards for support and stability on the ground.
Last two digits of the F-5's tail number painted in red on front fuselage, highlighted in white.
The Hornbill had a mixed material construction, having a steel engine mount and front fuselage covered with duralumin sheet.
The configuration is also often used for unmanned aerial vehicles, due to requirements for a front fuselage free of any engine interference.
These transformed into all three modes, but required swapping the front fuselage for Battroid mode.
The front fuselage had aluminium skin, while the rest of the surface was plywood covered with fabric.
Accordingly, the front fuselage underwent a major redesign.
The front fuselage was shortened to give the pilot a better view.