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A note about the gear door deletion. On those aircraft modified with gear door deletion, the wheels "barn-door" (because of the rotoration of the gear arms) during retraction, thus increasing drag while retracting the gear -- even without gear doors. So, buying a gear door removal STC is like buying snake oil -- buyer beware.
As far as flate plate drag of the wheels themselves, I'ved give it about 3sq/ft per tire, for a total of 9 sq/ft.
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