The Peyret-Nessler Libellule (Dragonfly) was a French two-seat, low-powered () parasol wing light aircraft built in 1927 to provide practical but economical flying. It was one of the first of these French avionettes. Design and development Eric Nessler was well known as a French glider pilot and builder in the inter-war period and Louis Peyret was an experienced aircraft designer and constructor. Peyret had designed and built the tandem wing Peyret Alérion glider which won the first British gliding contest in 1922 and had also frequently collaborated with others, the Peyret-Le Prieur seaplane being one example. When Nessler began to consider the design of a very low-powered two-seat lightplane, Peyret was a natural choice of partner. The intention was to produce a practical aircraft with costs no greater than those of a car. The three part parasol wing of the Libellule was rectangular in plan and without dihedral. Built around two box spars, its centre section was held high above the fuselage by pairs of parallel, outward-leaning struts from the spars at its extremities to the upper fuselage longerons and the outer panels were braced with duraluminum V-struts from the lower longerons out to the spars at about 60% span. The wing position had the advantage of keeping it largely clear of the prop wash and, by lowering the centre of gravity, increasing lateral stability. The centre section was entirely covered with Rhodoïd, a transparent material used to provide an uninterrupted upward view from the cockpits, and the outer panels covered with fabric. The Libellule's unusual ailerons, designed by Peyret, ran from the tips to about mid-span; mounted on the rear spar, they were divided span-wise into two roughly equal chord parts, hinged together and interconnected so that the rear surface had a greater deflection than the forward one, particularly in the case of upward deflections. The intention was to retain lateral control down to the lowest speeds. The Libellule was powered by a Salmson AD.3 three-cylinder radial engine within an aluminium cowling through which the cylinder heads projected for cooling. Behind the engine the wooden fuselage had a rectangular section, formed by four longerons with a series of frames. It was covered with thick plywood in the cockpit area under the wing but only thick further aft. Below the wing there was a single cockpit, long, with tandem seats for the pilot and his passenger behind. The passenger had