What is your scenario which sees the German's not attack West in 1940?
The December 11, 1939 contract between Brewster and the Belgian Ministry for National Defence, Aviation Department, did indeed cover license production. In addition to the order for 40 Model 339B's, the contract provided for Belgian license production. The Belgians were to notify Brewster that they were taking up that option by June 30, 1940, and if so they would have to pay Brewster $100,000 plus $2,800 per aircraft completed. The contract was very clear that this license did not include engines or engine equipment, instruments or armament. The extent of detail makes it clear to me that Belgium had plans to produce the Brewster.
That is not all the story, however. In the first week of September 1939 test flights were arranged for Yugoslavian and Belgian pilots and it is stated that 'The Belgians preferred the French Renard' (pages 74 to 76)
The conjectural Belgian Air Force of 1941 is a bit of a whimsey but surely the Renard R-38 is a bit of a stretch. The plane had been under development from November 1937 and still, even with a Merlin 11, was only on a par with the Hurricane in terms of speed in July 1939 though it was much faster climbing. That was a prototype, however, and the inevitable accretion of weight with the addition of military equipment would have seen that advantage diminish. A look at the Renard's proportions immediately make me question if it had cg problems. The armament was also only four rifle calibre Browning machine guns.
"Les qualités de vol et les performances de cet avion le situaient entre le célèbre « Hurricane » et le merveilleux « Spitfire»"
It is, so far as I am aware, the relationship between the centre of gravity of the aircraft and the centre of lift of the aerofoil that is the main determinant of basic stability.
If I go back 60 years to my days at primary school, and making balsa models, the way to get a stable flight was to stick some putty or plasticine on the nose and make the C of G well forward of the aerofoil.
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