2 were experimental aircraft built and flown in France in the early twentieth century by Robert Esnault-Pelterie.

The REP 1 was a single-seat tractor configuration monoplane powered by a 22 kW (30 hp) seven-cylinder two-row semi-radial engine[1] driving a four-bladed propeller with aluminium blades rivetted to steel tubes.

The fuselage was made largely of steel tubing covered in varnished silk and the wings of wood.

1 in having a slightly different undercarriage (of the same general arrangement) in addition to a large ventral balanced rudder.

It was entered for the Grande Semaine d'Aviation in Reims in August 1909, but Esnault-Pelterie did not compete there owing to an injury to his hand.