Recent content by Bretoal2

Thanks, I wrote most of this text. You may read about HS radials : https://fr.wikipedia.org/wiki/Hispano-Suiza_14AB https://fr.wikipedia.org/wiki/Hispano-Suiza_14AA and understand how and why these engines were a failure.

The production SE100 was to receive a conventional landing gear. And PE Mercier had already modified his drawings for 14R cowlings, and Hercules too....

Henri Déplante, who drawn the Bloch 152 / 155, writes that the plane was not suitable for a more powerful engine. The Bloch 157 was an entirely new design. The G&R 14R was much heavier than 14N and had to drive a larger propeller to withstand the extra power.

Power curves and boosts of post-war 12Z (12 Z-17) are in this thread : https://ww2aircraft.net/forum/threads/hs-12z-17-engine.53473/

No. In 1940 the G&R 14 N, in its latest versions 38/39 and 48/49, reached its peak power owing to the lack of a 2-speed supercharger and absence of a central crankshaft bearing. After the war, SNECMA (nationalized G&R) had to make hundreds of modifications to the 14 N to improve its...

The Lorraine-Dietrich company was moribund well before the nationalizations. Becoming the SNCM (Société nationale de construction de moteurs) by the nationalization laws,, its engineers worked on a type 130/137 24-cylinder beast, aiming for 1600 to 1800 hp...

About Marc Birkigt, an essential moment in his career took place at the time of the massive nationalizations of the aeronautical industry by the French Front Populaire (end of 1936). Having understood that Hispano-Suiza could not be nationalized, the government imposed the entry of Robert Blum...

Hope your sleep-deprived eyes saw (page 143 from Kotelnikov) that side views of VK 107 in Yak-3 and I-320 show SEVEN exhaust pipes....

You may read this (and other pages from the site) https://replicair.fr/avions/dewoitine-d551/dewoitine-histoire/

Three points : 1) The French aeronautical industry sought in 1940 to solve their issues caused by the aberrant management of programs and orders (1931 - 1936) and political instability (1936 - 1938) and nationalizations. And this in all areas: airplanes, engines, weapons. Hence the impression...

Another weakness of French fighters were the 7.5 mm machine guns, whose bullets were too light and lost their effectiveness at short distances. From this point of view, very good machines were the Bloch 155 series (well developed in the spring of 1940) or 157 (released later): with their two...

From Emmanuel Lage, five HS 12B prototypes were built, but the engine never flew. It was approved after type-tests in 1951.

Here - from Flight....

No. The 14 R was the development of the 14 P, which itself was the development of the 14 N. Certainly not a "new" engine. The 14 R was presented at the Paris aero show in December 1938 under the misleading name 14 N-50 "dont les essais encore secrets se poursuivent". But the pictures clearly...

About Saurer : above all, they had carried out a massive redesign of the original 12 Y crankshaft, whose weight had virtually doubled. And for Klimov.... The VK 107 was a "copy" of the 12Z principle : dual inlet, with differential opening diagram, one valve with carbureted air and one valve...