Aero carburettors work how?

[Rising Sun*]

I understand auto carbies.

If they're turned upside down the float arm is going to cut off the fuel and the engine will starve.

How did WWII aero carbies avoid this to allow flight in all attitudes?

[Man of Stoat]

They didn't, inverted flight was extremely limited with a carburettor equipped engine. The "break" manoeuvre used by the RAF just before attacking mitigated the problem somewhat, however.

[Man of Stoat]

You also weren't going to get much machine-gun fire out of a Spitfire or hurricane of the same period when inverted , because the Browning machine gun ejects by gravity out the bottom

[Rising Sun*]

What about centrifugal force?

I suppose the venturi effect will keep dragging fuel out of the fuel bowl as long as the pistons are maintaining the air pump effect, but in, say, a sustained high angle bank isn't the fuel going to get dragged away from the bowl outlet and starve the motor?

How did they manage a barrel roll with consistent fuel supply?

[Man of Stoat]

As I understand it, you've got enough grace (and a fuel pump) to do it, but try to stay inverted for more than a couple of seconds and you are going to have issues.

[Rising Sun*]

As I understand it, you've got enough grace (and a fuel pump) to do it, but try to stay inverted for more than a couple of seconds and you are going to have issues.

Fuel pump with conventional carbie will only fill bowl until float arm stops it.

Invert carbie and float arm stops fuel, but fuel in bowl is now in what used to be empty top of bowl, above (now below) float arm, with bottom of fuel bowl empty, which creates problems for fuel supply derived from anywhere under where fuel would normally be in roughly horizontal position.

[Rising Sun*]

Maybe there's some sort of non-return valve in the setup?