| 11. | Opposing-rotation aircraft propellers that share a common axis are known as contra-rotating propellers, rather than counter-rotating.
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| 12. | B�ttner also builds two-bladed carved wooden and two, three and four bladed plastic ultralight aircraft propellers.
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| 13. | His task at the committee, the forerunner of NASA, was to assess the vibration of aircraft propellers.
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| 14. | An aircraft propeller in the United Kingdom.
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| 15. | A military aircraft propeller and a plaque commemorating LtCol Bolt's accomplishments was erected at the airport in 2006.
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| 16. | Honda also aided the war effort by assisting other companies in automating the production of military aircraft propellers.
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| 17. | He specialized on problems connected with the design of aircraft propellers and of seaplane floats and flying-boat hulls.
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| 18. | Manufacturing companies, aircraft propellers, aero engine systems and terminology articles are also within the scope of the task force.
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| 19. | Most early aircraft propellers were carved by hand from solid or laminated wood, while metal construction later became popular.
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| 20. | Automotive gearboxes ran the opposite way to an aircraft propeller, and changing direction required modification of the camshaft lobes.
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