Composite materials for drones and eVTOL: fibers, prepregs and resins
Updated November 3, 2026
Composite structures combine strong, stiff fibers with a polymer matrix that holds them together and transfers loads. In drones and eVTOL aircraft, carbon fiber composites make up most of the airframe, rotor blades and many internal parts. Choosing the material system is choosing a manufacturing process, a certification route and a cost.
Fibers
Carbon fiber: the standard for primary structures. Standard-modulus fibers offer a balance of strength and cost; intermediate-modulus fibers (such as the IM7 or T800 classes) give higher strength and stiffness for weight-critical parts; high-modulus fibers maximise stiffness.
Glass fiber: cheaper, tougher and radio-transparent, used for fairings, radomes and secondary parts.
Aramid: high impact and abrasion resistance.
Quartz fiber: very low dielectric loss, used for radomes and antenna covers.
Matrix systems and product forms
Epoxy prepregs: fibers pre-impregnated with resin, laid up and cured under heat and pressure. Systems curing around 120 °C suit tooling and cost; around 180 °C give higher temperature resistance and are common for primary aerospace structures. Toughened epoxies resist impact damage better.
Out-of-autoclave (OOA) prepregs: cured with vacuum only, reducing equipment cost.
Dry fabrics and infusion resins: for resin transfer moulding and infusion of large parts.
Thermoplastic composites (PEEK, PEKK, PAEK): fast forming, welding, recyclability and high toughness; increasingly used for high-rate production.
Core materials: honeycomb and foam for sandwich panels with high stiffness at low weight.
Key specifications
Property
Why it matters
Tensile and compressive strength / modulus
Sizing of laminates
Glass transition temperature (Tg), dry and wet
Maximum service temperature
Cure cycle and out-life
Manufacturing window and cost
Compression after impact (CAI)
Damage tolerance
Qualification and allowables database
Certification effort
Fire, smoke and toxicity behaviour
Battery-related safety in eVTOL
Choosing a material system
Qualified prepreg systems with public allowables shorten certification for piloted eVTOL. For high-rate drone production, cost and cycle time often favour OOA, infusion or thermoplastics. Talk to the material suppliers early: changing the material later means requalifying the structure.
A reinforcement fabric or tape pre-impregnated with a partially cured resin. It is laid up in a mould and cured with heat and pressure, giving precise fiber content and high-quality parts.
What is the difference between 120 °C and 180 °C cure prepregs?
The cure temperature largely sets the maximum service temperature. 180 °C systems are standard for primary aerospace structures and hot areas; 120 °C systems are cheaper to process and suit many drone parts.
Why use quartz fiber composites?
Quartz fiber has very low dielectric loss, so radar and radio signals pass through it with little attenuation. It is used for radomes and antenna covers.
Are thermoplastic composites used in eVTOL?
Yes, increasingly. They can be formed and welded quickly, are tough and recyclable, which suits the high production rates eVTOL programmes plan.
What is out-of-autoclave curing?
Curing a composite with vacuum bag pressure and an oven instead of a pressurised autoclave. It lowers equipment cost and allows larger parts, with materials designed to keep porosity low.
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