Morane-Saulnier P

 

Thanks to the success of the Morane-Saulnier Type L and Type LA Morane-Saulnier sought to design an improved parasol in 1916. By September 1915 the Nieuport 11 and 11 had replaced the Types L and LA in the frontlines of the Aéronautique Militaire in the fighter role. Although parasols were still useful in the reconnaissance role, the common feel was that with the advent of the Fokker E.III in 1915, a more powerful version of the Type L was needed.

The new design was given the denomination of "P" by Morane-Saulnier, that single letter standing for "parasol". It was a complete redesign of the Type LA with an important number of changes. It was powered by a Le-Rhône 9Jb engine which yielded 110 hp of power. Its fuselage was completely faired with a circular cross-section which contributed to the streamlining of the airplane and its higher speed. The tail unit was similar to that of the Type LA. Armament varied and some machine were field-modified with a 0.303 in Vickers machine gun on top of the wing shooting outside propeller's arc plus a second machine gun on a mounting behind observer's cockpit. The Type P was tested on 31st March 1916 and was accepted for service with the Aéronautique Militaire under the designation of MoS.21. A total of 565 Type Ps were manufactured.

The Type P was used to complement many French reconnaissance aircraft, but it didn't replace the Caudron G.4, Farman M.F.11 and Farman F.40, which were French's main recon aircraft at the time. Many of the French recon and bombing squadrons were assigned some Type Ps which were used for various kinds of missions like short-range reconnaissance, light bombing and spy-dropping behind enemy lines. 

A total of two Escadrilles (Squadrons) were fully equipped with the Type P. The first of which was the MS. 140 created in September 1917 with a total of 13 Type Ps. This squadron was part of the 4e Armée (4th Army) as an Army Co-Operation Unit. The second one was MS.215 which was formed in September too and was assigned to the 6e Armée (6th Army) with also 13 Type Ps in strength. They also served with some other squadrons. However, they didn't stay in active service for long time as they were obsolete by mid-1916. In spite of the large number of built machines, only 118 were in service by August 1917. These were 61 at the frontlines, 52 at the RGA (Réserve Générale de l'Aviation - General Aviation Reserve), three under reparation and two probably serving as a source of spare parts. Both MS.140 and MS.215 were re-equipped with SPAD 16 by early 1918.

Apparently, the Type P was withdrawn from the frontlines due to a mixture of structural failure, pilot error or improper handling of the aircraft by ground crews as it seems that the type required some extra mechanic works. During fall of 1917 the Type P was withdrawn from active service and on 9th August 1917 a memo was issued by the Aéronautique Militaire's HQ to replace all Type Ps with the MoS.26, which was an improved version with a strengthened fuselage a circular engine cowling and the addition of an enlarged spinner to improve aeronautics. It's unknown how may MoS.26 were built.

A fighter version was also built by fairing over the observer's position and with a synchronized Vickers 0.303 in machine gun placed on the nose. Two prototypes were tested and performance was satisfactory. However, it was found that the parasol obstructed pilot's vision. A second prototype was built with a lower wing and the pilot's position aft of the wing which was equipped with an adjustable seat which allowed him to see over the wing at will. This second prototype was armed with two synchronized Vickers 0.303 in placed on the nose and had bigger fuel capacity. This new fighter's performance was only slightly better than the Type P and was not selected for use.

In addition, the Type P was exported to various countries:

• Brazil: In 1919 Brazil acquired a single Type P which was modified to not be able to fly. This version was called "Rouleur" or "Penguin" by the Frenchs and in Brazil, it was used to train pilots how to taxi. It received the serial 1325 and was written off shortly later, in 1920. As we couldn't find a pic of the Brazilian Type P, the drawing should be considered as speculative.
• Japan: A single Rouleur or Penguin was obtained by Japan in 1919 which was used to train pilots how to taxi. Just its Brazilian counterpart, we couldn't find any pic, so the drawing should be considered as speculative.
• Russian Empire: The Imperial Russian Air Service bought an unknown number of Type P from France. Most of these machines were powered by a 110 hp Le-Rhône engine, although some aircraft were uprated with 120 hp Le-Rhône ones. The Type P was clearly better than the Type L or the LA, but Russian pilots found the Type P harder to fly. Some few machines seem to have been locally built in Russia, but due to unpopularity among the pilots it was never used in large numbers.
• United Kingdom: The Royal Flying Corps (RFC) obtained a single Type P in 1916, which, with the serial number MS.746, was tested by the No.2 Aircraft Depot at Candas, in the Somme Department in France. Based on a favorable report of the Type P an order for three additional machines was placed, with some of them being armed with a machine gun and a fairing for a camera and wireless, with a machine gun for the observer in every airplane. 
  Due to a shortage in the Le-Rhône engine, deliveries were delayed. However, once that issue was solved, additional 20 machines were ordered and by September 1916 forty-four additional airplanes were ordered too. Some of those machines were equipped with the fairing for the camera and the observer's gun, but the synchronized forward-firing machine gun was not present in every machine. Instead a Lewis was mounted on top of the wing, firing outside propeller's arc. It's known that some Type Ps served with No.3 and No.1 Squadrons.
  The Le-Rhône engine was still short on supply, and some were finished with an 80 hp Le-Rhône. Of the 36 Type Ps that served with the RFC, nine did so with the No.3 Squadron. By January 1917 every Type P had been relegated to training units. 
  A total of 106 Type Ps were ordered, both of the MoS.21 and MoS.26 variants. The No.3 Squadron used some few MoS.26. By October 1917 the MoS.26 were sent to No.2 Aircraft Depot and those remaining to were relegated to Pilot School No.1 AD at St. Omer, Pas-de-Calais, in France and No.1 Reserve Training Squadron at Gosport, Hampshire, United Kingdom.

Sources:

1. Flying Machines Press - French Aircraft of the First World War

2. https://en.wikipedia.org/wiki/Morane-Saulnier_P