Roughly 20 sounds about right (it is pretty steep!).
If you tie your tail hook to the floor to simulate 20 angle
you should be fine for the fuel free flow test.
BTW Vx and Vy change with weight, and Vx of 61 is only applicable
to the factory flight test article at max gross wt. If you know your
Vx at max gross then you can rule of thumb that it decreases about
1 kt for each 100 lbs below gross. Personally, I never had 224XS up
to gross wt until after my initial 40 hr flight test period. Of course the
test goes on, the test goes on (I think I hear Cher in here)
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Ira N224XS
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