| 1. | It had three-bay wings without sweepback, wing folding.
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| 2. | The wings of both the monoplane and biplane versions featured prominent sweepback.
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| 3. | The wing is tapered in plan with less sweepback outboard.
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| 4. | Too much dihedral or sweepback generally causes Dutch roll.
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| 5. | There was then no flight experience with wings of this amount of sweepback.
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| 6. | Analysis work by Boeing engineer Vic Ganzer suggested an optimum sweepback angle of about 35 degrees.
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| 7. | The wings were sharply tapered with straight trailing edges, which introduced sweepback on the leading edge.
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| 8. | The trapezoidal wing has a 20-degree sweepback on the leading edge and a straight trailing edge.
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| 9. | The second version had a reduced sweepback to 32? allowing the wing and cockpit to be moved rearward.
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| 10. | Other changes to the wing included the removal of stagger from the design and the introduction of slight sweepback.
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