Airframe and structures
How an airframe is designed decides how fast it can be built. A structure that is two percent lighter but needs autoclave curing slows the whole production line. Apollyon designs airframes for out-of-autoclave resin transfer moulding and high-volume automotive stamping lines.
Designing for existing domestic industrial capacity
Missile production stalls when an airframe needs specialised tooling that nobody can supply at scale. Every structural choice in our portfolio satisfies a practical test: can an established Indian automotive or precision machining supplier manufacture this component at rate without two-year machine tool lead times?
India already has the commercial manufacturing base that attritable strike systems need: automated metal stamping, aluminum casting, multi-axis CNC machining, electronics assembly, and commercial composites. Apollyon builds its structures through this existing tier-1 base rather than waiting for dedicated defence aerospace lines.
Structural architecture by product
| Product | Structure | Manufacturing route |
|---|---|---|
| Hemlock | Composite skins over machined 7075-T6 aluminium ring frames around the payload and engine bays; chined nose. | Out-of-autoclave resin transfer moulding for outer skins; machined ring frames; zero autoclaves in the critical path. |
| Nightshade ADX-1 | Moulded composite airframe, low-drag aerodynamic contouring, internal fuel bladder with dynamic centre-of-gravity compensation. | Moulded composite layup engineered for volume production and repeatable assembly at commercial tier-1 suppliers. |
| Ahuti | Composite shell with topology-optimized internal infill; elliptical nose merging into parabolic aft; swept aerodynamic arms; flush NACA cooling ducts. | Hybrid additive tooling and composite consolidation; high torsional rigidity prevents aeroelastic flutter at certified 498 km/h speeds. |
Three structural decisions and their operational returns
Out-of-autoclave resin transfer moulding
Autoclaves are expensive, and they cap how fast composite parts can be made. Moving fuselage shells to out-of-autoclave resin transfer moulding (RTM) removes autoclave cycle times from the assembly schedule. This manufacturing choice keeps composite work off the critical path at the rates the family plans.
Stamped bulkheads and automotive steer-by-wire actuators
Internal bulkheads use progressive die aluminum stamping borrowed from automotive chassis manufacturing. Control surfaces rely on commercial brushless DC servos rated for the single-use mission profile of an expendable missile. Specifying 30,000-hour aerospace-grade actuators on one-way rounds adds cost and lead time without adding anything the mission needs.
Structural rigidity as a guidance parameter
In high-speed airframes, structural rigidity directly influences guidance precision. Aeroelastic deflection shakes the inertial measurement unit, which corrupts the high-rate state estimate. Our physics backbone models airframe bending modes, while optimized carbon infill maintains structural stiffness during high-g pull-ups.
For long-range platforms like Hemlock, frontal radar signature is managed through airframe geometry—such as a chined nose, planar facets, and flush joints—rather than delicate radar-absorbent coatings that require climate-controlled maintenance. Designing clean geometry into tooling keeps per-unit manufacturing simple on a serial line.
Products carrying this subsystem
Constrains: launch systems.