Well, as you probably know, when you fly the A20 inverted it noses towards the ground. So basically, it IS impossible to fly inverted...while using combat trim. For basics: If you are flying level and trim your elevators up, the plane starts to nose up. So, I used that same concept. Before I went inverted I trimmed my elevators all the way down (which is why you see the plane start to nose over before I roll) making my plane fly "level" while inverted.
NOTE: Also, Mr. Strip, notice that that was the small FH...and not the rounded FH (which is much, much easier to go through
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