Design of a spar with applying present-day composites based on autoclaved carbons.

Cylindrical and conical carbon tubes for tail beams and pushing rods. Main dimentions are shown for you to choose parts in our catalogue or to order parts with your individual measurements.

Applied technologies

    Traditional design strength elements in high-technological models were completely substituted for parts made from carbon/kevlar composites. For the first time new parts were used in models of F-1 class. After that, traditional units were also replaced by composites in models of F3, F2 classes, Sunrise-Sunset Competition and HLG. Strength of new composites is 1,4-2,2 times higher than strength of composites made on bases of glass fibres and epoxy resins. At the same time with the considerable increase of strength, plasticity of new composites was increased, and probability of exfoliation of plastics based on composites was reduced. Thus, a unique possibility appeared to reduce dimentions and weight of strength elements of a model design by 1,3-1,6 times without decreasing of strength, on the contrary, in a number of cases with its increasing.

Composites materials of high technology.
(Autoclave technology and technology of pressure by rubber)

    Parts that are made from carbon/kevlar composites completely substitute strength elements of a design in:
    - aeroplane models. They are spars, edges, capstrips, D-boxes, fuselage, propeller;
    - yacht and launch models. They are body shell, masts and ship's propeller;
    - hang-gliders. They are all the parts except the engine;
    - submarines and airplanes. They are masts of antennas, radomes, other parts of fuselage and wing;
    - automobiles. They are bumpers, intakes, other parts of body and interior of prestigious automobiles.

    Autoclave technology and technology of pressure by rubber allowed (as compared with standard composites based on L 285, etc.)
    1. to increase the strength by 10-30%;
    2. to reduce possibility of exfoliation;
    3. to increase the temperature at which became possible to use these parts.
    Hence, weight and dimentions of a part can be reduced by 20-60% while strength remains the same.

    Differences of this technology lie in
    1. applied material with the temperature of polymerization 120-200?C as a hot setting binder;
    2. pressure effecting up to 32 bar on the part during polymerization.
It allows
    - to occupy areas by the hot setting binders not only between fibres but also between cells of a cloth.
    - to eliminate gas bubbles in parts.
    - to reduce the distance between layers of cloth

1. Balsa 2. Carbon composite 3. Kevlar composite

    Let us have a look at a design of a spar that has a square section. Spars is made from multi-layer unwoven carbon. Capstrip, leading and trailing edges are produced in the same way. So called 'sandwich', that is carbon-balsa-carbon or carbon-foam plastic-carbon, is applied as a spar web. Carbon cloth that has cross woven fibres is applied for a spar web. Design units are combined by epoxy resin of the "UHU Plus 300" or "VK-9" types. All carbons are produced in autoclave.
    Cutting of carbons is carried out on circulation machine with discs that have diamond cutting edge. At the same time squirt of water is fed onto the disc and dust and the volatile matter are drawn out from the working area.

D-Boxes