| 41. | The wing spars were duralumin structures, though the first of the two Mussels had spruce ribs.
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| 42. | The rear fuselage section was a large, flat sided duralumin beam with frames and riveted skin.
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| 43. | The fuselage was built around four longerons, with rectangular frames and covered in longitudinally ribbed duralumin.
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| 44. | The wings were built around twin duralumin spars and pine and plywood ribs and had plywood leading edges.
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| 45. | The forward portion was clad in duralumin, and the remainder covered with fabric laced to the framework.
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| 46. | The hull is made from duralumin and features a stepped shape, similar to most powered flying boats.
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| 47. | They shared the same all-metal structure, mostly Duralumin covered with narrow aluminium strips applied longitudinally.
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| 48. | It used a new alloy called Alclad that combined the corrosion resistance of aluminum with the strength of duralumin.
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| 49. | In the final episodes, Duralumin stages a coup d'�tat to help Mr . X conquer Silverland.
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| 50. | The fixed tail was built of pine and plywood-covered, the moving surfaces duralumin with fabric cover.
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