Redman, Migdalia (2012) Handbook of propeller aircrafts. Orange Apple, Delhi, India. ISBN 9788132328629
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Abstract
Aircraft propellers convert rotary motion from piston engines or turboprops to provide propulsive force. They may be fixed or variable pitch . Early aircraft propellers were carved by hand from solid or laminated wood with later propellers being constructed from metal. The most modern propeller designs use high-technology composite materials. The propeller is usually attached to the crankshaft of a piston engine, either directly or gearing but on larger engines and turboprop aircraft it is essential through a reduction unit. Light aircraft engines often do not require the complexity of gearing but on larger engines and turboprop aircraft it is essential. The twisted airfoil (aerofoil) shape of modern aircraft propellers was pioneered by the Wright brothers. They found that a propeller is essentially the same as a wing and so were able to use data collated from their earlier wind tunnel experiments on wings. They also found that the relative angle of attack from the forward movement of the aircraft was different for all points along the length of the blade, thus it was necessary to introduce a twist along its length. Their original propeller blades were only about 5% less efficient than the modern equivalent, some 100 years later. Alberto Santos Dumont was another early pioneer, having designed propellers before the Wright Brothers (albeit not as efficient) for his airships. He applied the knowledge he gained from experiences with airships to make a propeller with a steel shaft and aluminum blades for his 14 bis biplane. Some of his designs by him used a bent aluminum sheet for blades, thus creating an airfoil shape. These are heavily undercambered because of the construction of an aircrew this and combined with the lack of a lengthwise twist made them less efficient than the Wright propellers. Even so, this was perhaps the first use of aluminum in the construction of an airscrew.
| Item Type: | Book |
|---|---|
| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics |
| Divisions: | Electronic Books |
| Depositing User: | Esam @ Hisham Muhammad |
| Date Deposited: | 13 Nov 2022 08:23 |
| Last Modified: | 13 Nov 2022 08:23 |
| URI: | http://odlsystem2.utm.my/id/eprint/3596 |
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