Hi Maverick.
I will try to put this as gently as possible
In simple terms....
NO!! These cannot be turned off, because it would give you an advantage over the pilots in the arena.
Blackouts and Redouts are a result of pulling too many "G's". This is basically the force a pilot feels (and its results on the human body) when he performs certain manuevers.
Think of this like what you feel when you get pinned back in your seat when your car accelerates very fast, or how you are thrown into your seatbelt when you brake very fast. Or rollercoasters are another way to imagine it. However realize that in an aircraft the effect is magnified by many times, because of how fast you are going.
The way to minize these effects in the game is to make sure you go easy on the joystick when you perform a turn or other manuever. You should also realize that the faster your plane is going, the easier it is to blackout or redout.
So go easy on the stick. Ease it from position to position, and don't just yank it back and forth.
Hope that helps.
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Vermillion
**MOL**, Men of Leisure,
Dicta Verm: "Never give the suckers an even break!" or translated "Never engage without an advantage"