Originally Posted by Genghis the Engineer
On the question of anti-g suits: conventional g suits require support from the aeroplane that whilst not impossible, would be very hard to achieve in a piston engined aeroplane. I don't think it's been tried.
As far as I understand the anti-g suits, they are usually connected to the bleed air derived from the engine via the controller, which senses the amount of G and adjusts the air flow (and thus pressure from the suit on the legs) to the suit accordingly. Usually, only turbine-powered aircraft require wear of anti-g suits, so using a small amount of bleed air isn't a problem, but I don't think it would be as hard to achieve as you point out. One could use supercharger, similar to the ones used for cabin pressurization piston aircraft and modify it to deliver sufficient amount of airflow for use of anti-g suits. But as you point out, if they exist, I don't think they are widely used on piston aircraft.