Project developed in partnership with Gizmo Engineering
The Idea
A conventional drone is limited by its reach: it has to take off from the ground and fly all the way to the target, burning battery and exposing itself the whole way. Spear was built to solve that — a folding drone launched inside a missile body that deploys in mid-air and begins its mission already near the target. The system is autonomous, with imaging capability and the ability to carry small payloads.
Three Challenges With No Parallel in a Regular Drone
1. Surviving the Launch
Launch acceleration loads are orders of magnitude beyond anything a drone experiences in flight. Every component — motor, battery, camera, electronics board — must withstand that load while folded and clamped. It changes the design end to end: no components hanging on cables, no large masses on long arms, and everything secured along at least two axes.
2. Deploying Reliably, Once
The deployment mechanism is the critical failure point: there is no second chance, and if one arm fails to unfold the drone cannot fly. The design answer is to minimize the number of components that must act — spring-driven arms that deploy themselves on a single lock release, instead of motors performing the deployment. Fewer active components means fewer things that can fail — a principle straight from disciplined mechanical engineering.
3. Weight and Volume at the Same Time
In a regular drone you fight for weight. Here you also fight for volume, because the drone must fit the launcher's internal diameter. The two constraints push in opposite directions: a compact structure demands folding, folding demands joints, and joints add weight. That balance is the entire design.
Development Scope
- Mechanics and mechanisms: folding, locking, and deployment.
- Composite materials: stiffness-to-weight ratio — see the production methods in manufacturing technologies.
- Electronics and flight control: stabilization at the instant of deployment, the hardest moment of the flight — see drone development.
- Imaging and payload: a mechanical and electrical interface for carrying a small payload.
A Note on Context
This is a defense-sector project, so the details presented here are deliberately general. Defense projects are subject to confidentiality constraints and export regulations, and we work accordingly.
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Photos from the project
