There a lot of numbers higher than the 9Gs that are safe-ish and reasonable-ish for human drivers/pilots to experience regularly. A big bag of water with bones inside that likes to breathe doesn’t take well to high levels of acceleration, eg. really fast turns.
Outside of planes, I don’t know that any land or water based vehicle could pull 9Gs as you’re limited by the traction of the tires and whatever physics effect boats on the water.
There a lot of numbers higher than the 9Gs that are safe-ish and reasonable-ish for human drivers/pilots to experience regularly. A big bag of water with bones inside that likes to breathe doesn’t take well to high levels of acceleration, eg. really fast turns.
Outside of planes, I don’t know that any land or water based vehicle could pull 9Gs as you’re limited by the traction of the tires and whatever physics effect boats on the water.