What we do 

Callen-Lenz is a UK leader in the design, development, testing, delivery and after sales support of next-generation Uncrewed Aerial Systems (UAS), from micro-UAS to Medium Altitude Long Endurance (MALE) aircraft exceeding 150kg MTOW. Leveraging in-house expertise, we deliver platforms built for highly contested and challenging environments.

Our full-spectrum capabilities include prototype design, end-to-end hardware, firmware, and software design, payload integration, and ground control systems, supported by secure, rapid flight test and evaluation processes. We can deliver high-rate manufacture, operational delivery, training and in-service support.

Through full engineering and software design lifecycle, cyber-secure communications, and operational ‘capability as a service’, we provide tailored solutions to government, defence, and commercial partners, ensuring operational readiness, safety, and mission success.

Callen-Lenz - 2025 Showreel
Trusted UAS capabilities with operational success globally

Platforms

We are specialists in the rapid development of platforms including multi-rotor, fixed-wing, electric, hybrid, internal combustion and jet. We develop platforms to perform in a variety of highly contested and challenging environments based on operational experience alongside our civil and defence partners.


Koios 

Fregata

Products

Our multi-disciplinary teams provide OEM avionics system design, payload integration, and support across the aerospace domain, including autopilots, flight control systems, platform management computers, and ground control stations. This capability enables us to rapidly adopt new technologies while  remaining cyber secure.
 

 
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Technical services

We have extensive knowledge and credible experience across crewed and uncrewed aircraft design, development, manufacture, production, delivery, test and evaluation and regulatory compliance. We offer our customers unbiased advice and support to optimise programmes, reduce risk and deliver pioneering technical solutions.

Platform development

High integrity software

Operational services

We have a history of delivering reliable, repeatable, international UAS operations since 2008. The rapid evolution of UAS capabilities and integrations is often best exploited as a ‘capability as a service’. To help clients achieve mission success, we offer planning, commissioning and execution of operational services in challenging environments globally.
 


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How we work 
  • Define precise operational needs.
  • Capture mission objectives.
  • Define project plan for design and delivery.
  • Sub-scale prototyping.
  • Agile and spiral development.
  • UK CAA and MAA approved UAS trials process.
  • Mission matched payload integration.
  • Platform validation and performance testing.
  • Test and evaluation on CL airfields or military ranges.
  • Full scale system development.
  • Client demonstration flights.
  • High-rate manufacture.
  • Transition support to operational area.
  • Operational ‘capability as a service’ options.
  • Training courses in UK or in-country.
  • OEM technical support.
  • Operationally tailored spares support.
  • Maintenance schedule support.
Get in touch 

3 The Old Barns, Manor Farm
Chilmark
Salisbury
Wiltshire SP3 5AF