cryoscum wrote:I've wanted to try random oriented strands in resin, i.e. make a thick paste of resin and lots of finely chopped carbon and compress it between 2 sheets of glass with a set of packers off to the sides to ensure an uniform and predictable thickness. From what I would guess the random orientation of the strands would at least provide uniform flexural capacity in any direction, unlike laminated layers of cloth that depend on a change in cloth orientation to increase stiffness. This method may also provide some options to the designer, such as fins that start thick at the root and taper towards the tip, something hard to achieve with layered cloth.
You will achieve non-directional strength, but it won't be as strong as using cloth:
The fibre length will be much shorter
The resin:fibre ratio will be much higher
So you won't have as much fibre in the laminate.
Cloth enables you to orientate the fibres to achieve the strength where you need it.
Which now prompts the question - how were the fibres orientated in the fins in question? How many layers? Did at least one of the layers have the fibres at a different orientation?
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