It was proven decades ago that you didn't need a motion base under a flight simulator if your visual scene generator was good enough.
Don't need it to do what? To train pilots to operate the flight management system you don't need motion much, but you don't need an outside visual for that either. Manual control behaviour on the other hand has been shown again and again to benefit from motion cues. What you claim to have been proven long ago is in fact not settled at all in the simulation community. Regulations also still require a motion system for high-end training simulators and there's a reason for that.
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It was proven decades ago that you didn't need a motion base under a flight simulator if your visual scene generator was good enough.
Don't need it to do what? To train pilots to operate the flight management system you don't need motion much, but you don't need an outside visual for that either. Manual control behaviour on the other hand has been shown again and again to benefit from motion cues. What you claim to have been proven long ago is in fact not settled at all in the simulation community. Regulations also still require a motion system for high-end training simulators and there's a reason for that.