Merlin negative G cutout too quick?

[WTE_Galway]

Originally Posted by IvanK

The source paragraph comes from the reference document in the UK national archives AVIA 13/234. The Devs have a complete copy of this document. The "G number line" is mine to illustrate how I think things should happen in game. Reference G in Straight and level flight is 1.0G.

Interesting document. The G value given is likely correct but the suggested reason for cut out whilst not totally wrong only accounts for the initial momentary "splutter" the full cut out was for a totally different reason.

From Technical Order T. O. No. 02-55AC-2

"An idiosyncracy of the original SU carburetor was a condition known as "rich cutout" caused by negative g. In fact, the negative g cutout was a two-stage event. At the onset of negative g, fuel was forced to the top of the float chamber, which exposed the main jets to air. This caused the first, momentary lean cutout (Fig. 4.31). If a negative g condition continued, the floats reacted to the reverse of normal conditions and floated the wrong way, that is, they floated to the bottom of the float chamber. The needle valve opened wide, allowing full fuel pressure from the engine-driven pump to flood the carburetor. And excessively rich mixture was then admitted to the supercharger, causing the more serious rich cutout."


Note the two stage process over a period of time... which is why I was commenting that having the engine suddenly cut at a particular G figure is highly unrealistic.