Does a prone position for the pilot minimize g-force effects?
It is true that the body can withstand higher g-forces in the prone position. The reason is that in the prone position, g-forces don't pull blood down to the lower body and away from the brain, as happens in the seated position.

The concept was explored for combat aircraft with the Italian Savoia-Marchetti SM.93 and the British Gloster Meteor F8. These aircraft revealed some practical issues with the prone position:


It is much less comfortable for the pilot than a seated position, especially during long flights.
It is much more difficult to design an ejection/escape system. The Meteor F8 required the pilot to jettison the rudder pedals and crawl backwards to an escape hatch.
It affords much less visibility to the pilot.


In light of these issues, it was found more practical to stick with seated pilots. In modern times, g-suits and advanced training techniques like the "hook" maneuver have allowed fighter pilots to withstand higher g-forces than in the past. Both involve reducing blood pooling in the lower body by squeezing or flexing leg and abdomen muscles to restrict unwanted blood flow and pooling.