@ Sokol1. I think it has to do with planes with carburettor engines, like the Merlin engine of the Hurricanes in your pictures. As an example: the German Daimler-Benz engines have direct fuel injection, so it can take much more negative Gs. Carburettor engines can't. The fuel won't reach the engine so the combustion isn't good, so you get dirty thick smoke and the engine may stop.
It is possible that it is related with altitude too, because on high altitude is less oxygen, so the combustion will be different.
__________________
If you are insecure: use more bullets.
|