CNC help required for final year Uni project

[ChristoT]

Can you not just make a hot wire cutter and use polystyrene?  Non pre-preg is cheaper and doesn't need to be kept in a freezer   you can pre preg it yourself prior to use or do a wet layup. Why the need for high temp resin?

Weight is going to kill us on this project. Whilst I know non-pre-preg (i.e. sandwich composite) is substantially cheaper, there is no way it can be made lighter. Last year's winner still had the petrol engine, which gave over 2x the power this years' single e-flight 10 gives us. Their plane weighed a scant 960g. That includes the 500g engine + ancillaries! If we have CF ribs with a single CF skin over the top, it will weigh next to nothing, yet still be sturdy enough. We need this thing to be under 1kg in weight, with the full 2m span.

The high temp resin is required because the pre-preg will be autoclave cured. And whilst the moulds will be single use, I don't want to risk warping. Not when the centre of lift and centre of gravity have to line up so critically!