I guess what I’m really asking is, would it help a human to withstand higher g’s than our current technology, (g-suit alone)?
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This would not help.
The reason humans have difficulty with high G’s is that the blood flows away from the brain during positive G’s and towards the brain during negative G’s. Adding fluid to the cockpit would do little to alleviate this. Your body is still experiencing the acceleration and adding fluid to the cockpit just means that it is accelerating at the same rate.
It might help a bit in a crash since the G-force would be spread across the entire body and not just at the points in contact with the restraint harness. This is of little to no benefit, and would greatly increase the cost of the plane.
It would essentially do the same job as a modern G-suit. For example, the suit for the Eurofighter Typhoon compresses the legs and arms already (and possibly the lower torso, can’t quite remember). That only leaves the area around the lungs, and the head, unpressurised by the suit, and compressing those isn’t desirable anyway if you want to continue to breathe and stay conscious.
Liquids (I know you said fluids, but as G-suits already use gas I’ve assumed liquids) are also a lot heavier than air (and air can be drawn in from outside the aircraft constantly), so that’s just extra weight that isn’t needed on an aircraft.
No because a pilot is a sealed sack of fluid (blood), and the being immersed in a liquid will do nothing about bloodflow to the brain. G-forces arent something pressing on the person. Its the human body keeping up with the rapid changes in direction if the aircraft.
“We’ve succeeded!! According to the instruments the g-forces were spread out across his body! How’s the pilot feeling?”
“He drowned, sir.”
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