It took 15 years and a million man hours to design , build and test but in
1977 International Harvester introduced the 1440, 1460, 1480, and later
the 1420 Axial-Flow combines series. The Axial-Flow System featured a single
in-line rotor with impeller on the front rotor and a stationary rotor
housing with concaves and separating grates. This simple system the
cylinder, rear beater and straw walkers of the IH 15 series conventional
combines. Ertl sold a Blue Print Replica 1/32 Axial flow toy and two
versions of a 1/80 model. The first 1/80 model had a corn head only and a
later revised edition had interchangeable heads.