The wing was in three parts, with a short span, constant chord centre section and two straight-tapered, square-tipped outer panels.
[1] The 30 kW (40 hp) Chaise 4-E engines were air-cooled, inverted V-4s with a narrow angle between the cylinders, so were unusually compact.
The fuselage design made it easy to modify; for example, a hinged panel in the side could admit patients on a stretcher.
[8] In December 1937 it changed engines again, with the installation of smaller, 30 kW (40 hp) Train 4Ts, similar to the 6Ts but with four cylinders, in order to make record attempts in the low power category.
[9] A year later, in December 1938 the Duverne-Saran had begun tests powered by two 52 kW (70 hp) air-cooled [Minié 4.D0 Horus flat fours.