| 11. | Faster aircraft usually have retractable undercarriages, which folds away during flight to reduce air resistance or drag.
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| 12. | Like most airliners it is a monoplane with fixed wings and has a retractable undercarriage in tricycle configuration.
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| 13. | This increases internal storage for fuel, retractable undercarriage, armaments and in some cases even passengers and crew.
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| 14. | The amphibious floatplane Otter features a unique four unit retractable undercarriage, with the wheels retracting into the floats.
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| 15. | More complex types, like those with retractable undercarriage or variable pitch props, require additional training and licensing.
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| 16. | It was a twin-engine, low-wing monoplane with a retractable undercarriage, and a tailwheel.
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| 17. | The resulting machine introduced several features not found on trainers : retractable undercarriage and trailing edge flaps amongst others.
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| 18. | As an amphibian the Kittiwake needed to have a retractable undercarriage, a most unusual feature at this time.
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| 19. | The F . K . 54 was most notable as Koolhoven's first aircraft with a retractable undercarriage.
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| 20. | Though the Discus and the Carat share wings, they position them differently : the Discus is a retractable undercarriage.
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