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In 1903 the brothers built the powered Wright Flyer, using spruce, a strong and lightweight wood, and Pride of the West muslin for surface coverings. They also designed and carved their own wooden propellers, and had a purpose-built gasoline engine fabricated in their bicycle shop. Wilbur made a 1903 entry in his notebook indicating the prototype propeller was 66% efficient. Modern wind tunnel tests on reproduction show they were 75-82% efficient.
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In 1904 the Wrights built the Flyer II.
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In 1905 they built a new airplane, the Wright Flyer III.
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