Ponnier M.1 Biplane Fighter
The French-originated Ponnier M.1 biplane largely failed as a fighter - it was outclassed by many other designs appearing during World War 1.
Entry last updated on 10/18/2016; Authored by Staff Writer; Content ©www.MilitaryFactory.com
While the earlier Ponnier L.1 biplane scout aircraft (detailed elsewhere on this site) failed to impress French authorities (despite it being based on the D.III monoplane racer), it served to provide a sound foundation for the company's next offering - the M.1. Design work on this aircraft was attributed to Emile Eugene Dupont with manufacture, once again, handled under the Avions Ponnier brand label. A first flight was recorded during 1915 as World War 1 raged in Europe and beyond and service introduction followed in 1916. However, the aircraft fared poorly as fighting platforms which led to an appropriately short service life - they were pulled from action as soon as November 1916. Adding insult to injury, just twenty or so of the design were manufactured in all.
With the earlier L.1, part of its failure resided in selection of a 50 horsepower engine. The fuselage was carried over from the D.III racer and biplane wing structure added to this. However the design held qualities that restricted its performance as a military product and no production contract arrived to award the work completed. Building upon this, the M.1 was given an unequal-span biplane wing arrangement featuring single bays and parallel struts with "cut outs" featured at both structures to help improve the pilot's vision out-of-the-cockpit. Power was now served through a Le Rhone 9C 9-cylinder rotary engine outputting 80 horsepower and this drove the usual two-bladed wooden propeller fitted to the nose of the aircraft. A rather oversized propeller spinner was added for aerodynamic integrity but, it was found, restricted engine cooling. On the whole, the new aircraft exhibited traditional fighter-like qualities of the period such as a slab-sided fuselage, an open-air cockpit and fixed wheel-and-skid undercarriage arrangement. Another key physical quality of note was the rather small tail planes used.
During January 1916, with ace Charles Nungesser at the controls, the prototype M.1 crashed (Nungesser survived) but this was not enough to derail the program for a production order called for a batch of the aircraft to be constructed. By this time, Avions Ponnier (as a brand label) was succeeded by La Societe Anonyme Francaise de Constructions Aeronautiques though Louis Ponnier still held control of his company. Despite a low production figure, the type saw operational service with Belgian air service units and a few examples were flown by the French though, in the latter, the aircraft did not attain official unit status. In Belgian service, the oversized propeller spinners were usually removed to improve airflow to the engine and several other control modifications were instituted but none of these changes produced a proper fighting aircraft. A poor review given by Belgian ace Willy Coppens all but doomed the M.1 and its use was given up before the end of 1916.
The related Ponnier M.2 was an attempt at a two-seat version of the M.1 relying on increased overall dimensions and intended to interest the British Royal Flying Corps. This version was never developed.
As completed, the M.1 could reach speeds of 104 miles per hour and managed a climb rate of 700 feet per minute. Armament was a single 7.7mm (0.303 caliber) Lewis machine gun. However, the M.1 lacked interrupter gear for this weapon and thus its placement was along the upper wing unit to clear the spinning propeller blades when fired.