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In Russia, they learned how to make ultralight blades for screws with a diameter of up to 16 meters

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Image source: rusnanonet.ru

The manufacturing technology of ultralight carbon fiber blades was developed by the Intersectoral Engineering Center "Composites of Russia" of the Bauman Moscow State Technical University. A two-bladed screw created using this technology has a number of advantages over traditional metal screws: at times less weight, greater durability, high wear resistance and attractive appearance.

Initially, this development was intended for the aeroelectric lifting aircraft AELA-100. The UAV weighing 315 kg and with a flight range of more than 100 km was created by JSC OKB Kristall as part of a project to develop a complex of unmanned aerial vehicles of aircraft and helicopter types with various mass-dimensional characteristics. A drone of this type and this dimension was created in Russia for the first time. In 2019, the development was presented to Russian President Vladimir Putin at the MAKS Air Show.

Initially, the AELA-100 screws were manufactured by JSC OKB Kristall from aluminum alloy and needed a significant weight reduction. Specialists of the MIC "Composites of Russia" of the Bauman Moscow State Technical University carried out work on the redesign and manufacture of samples of propellers using the technology of thermal vacuum molding from carbon prepreg.

"One of the main advantages of the screws manufactured by us is their weight, which was 1.6 kg, while the aluminum one weighed almost 12 kg," says the director of the MIT "Composites of Russia" Bauman Moscow State Technical University, Doctor of Technical Sciences.Vladimir Nelyub. "This product has improved rigidity due to the use of polyurethane foam as a filler for the central cylindrical element of the blade, as well as aluminum bushings to protect against deformation of polyurethane when fixing screws."

Due to the weight of the screw, which has become 7.5 times smaller, the moment of inertia of the rotor decreases, which leads to a decrease in the required power to change the rotation speed up or down. Thus, the control of the lifting force of the aircraft becomes less inert.

The technology of manufacturing ultralight carbon fiber blades using fiberglass tooling is universal and can be applied to larger aircraft.

"The size depends on the final product for which the screws are intended," explainsVladimir Nelyub. - The maximum length of the blade with the developed geometry can be used in wines up to 16 meters in diameter."

The two-bladed screw made of polymer composite materials is only one of more than 50 research and development works carried out by the Intersectoral Engineering Center "Composites of Russia" of Bauman Moscow State Technical University from 2013 to 2020. This is a good example of how the scientific and technical potential of one of the country's leading universities is embodied in real projects.

Source of information and photo: press office of the Engineering and Innovation project of the Industrial Project Management Center

The rights to this material belong to RusNanoNet.ru
The material is placed by the copyright holder in the public domain
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