Amongst other warbirds over the past year, however, they have worked on a Piper L-4H Grasshopper ... The L-4 is, of course, a Piper J-3 Cub after modest modification for military service.

The Piper J-3 Cub is among aviation's most iconic light ... every 20 minutes at its peak The military variant, designated L-4 ...

The Grasshopper—a Piper Cub as a civilian—was flown during the war as a liaison and observation airplane, but Carpenter, war-weary and homesick, became dissatisfied with flying as an artillery ...