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In the Canadian air traffic control radar replacement programme, a Cossor monopulse SSR will be interfaced to a Raytheon primary radar. Shown is the SSR's large vertical aperture (LVA) antenna...

In the Canadian air traffic control radar replacement programme, a Cossor monopulse SSR will be interfaced to a Raytheon primary radar. Shown is the SSR's large vertical aperture (LVA) antenna...

In the Canadian air traffic control radar replacement programme, a Cossor monopulse SSR will be interfaced to a Raytheon primary radar. Shown is the SSR's large vertical aperture (LVA) antenna...

Final phase – flight testing — of a multi-blade propfan, under development in a 3-year U.S. programme, is expected later this year. Shown is the prototype undergoing static tests in Southern...

Final phase – flight testing — of a multi-blade propfan, under development in a 3-year U.S. programme, is expected later this year. Shown is the prototype undergoing static tests in Southern...

Final phase – flight testing — of a multi-blade propfan, under development in a 3-year U.S. programme, is expected later this year. Shown is the prototype undergoing static tests in Southern...

Tethered at up to 3,000 metres above their ground- or sea-based mooring pads, aerostats located along the southeastern United States provide unmanned platforms for coastal and sea surveillance,...

Tethered at up to 3,000 metres above their ground- or sea-based mooring pads, aerostats located along the southeastern United States provide unmanned platforms for coastal and sea surveillance,...

Tethered at up to 3,000 metres above their ground- or sea-based mooring pads, aerostats located along the southeastern United States provide unmanned platforms for coastal and sea surveillance,...

Here we see a classical microburst in association with heavy rain, immediately northeast of Denver's Stapleton International Airport in Colorado (U.S.A.). The horizontal outflow is seen only to the...