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57

GPS master clock and network time

server that delivers accurate, software-

configurable time and frequency signals

in all circumstances, including GNSS-

denied environments”.

He told us that its compact size and

high level of ruggedisation (to MIL-

STD 810G) make VersaSync suitable

for mobile air/land/sea applications in

harsh environments. “Its small footprint

allows for easy integration of the time

and frequency functionality into systems

architecture,” he added.

In addition, Sohn remarked that

VersaSync accommodates an OCXO

or CSAC oscillator, allowing the unit to

maintain frequency and time accuracy

for long periods of GPS/GNSS outage.

“It can also be re-synchronised by an

external reference,” he said.

It provides time and frequency

interfaces in all formats: NTP, PTP, IRIG,

1PPS, 10 MHz, serial and more, with

other interfaces available upon request;

for military applications, SAASM GPS is

also available.

Reference Technologies had on

display a version of its Hummingbird,

a VTOL unmanned craft that combines

a central ducted fan with peripheral

multiple rotors, giving it an unusually long

flight duration for this type of craft.

Model I is battery powered with a

medium flight duration and light payload

capacity, while Model II is a hybrid with

an IC engine generating power for its

electrically driven 19 in central counter-

rotating dual fans and six external rotors.

Model III, which uses eight external rotors

in conjunction with a 24 in central ducted

fan, provides a payload capability of

more than 20 lb, and flight times in the

region of six hours.

Each version is equipped with multiple

hard points so that it can carry and

release mission-specific payloads. Direct

flight control and pre-programmed

flight plans are managed via a range of

ground control interfaces.

Allen Bishop told us that ‘Gen 2’ is

currently in development and that this

will have the capability to carry a 75 lb

payload for a flight duration of about ten

hours.

HiTec RCD has recently launched

IP67 industrial servos for UAV applications,

Shawn Spiker told us. These feature a

digital MOSFET amplifier, a brushless

motor, a magnetic encoder position

sensor, multi-rotation capability feedback,

hardened steel gears with low backlash

and a rugged aluminium alloy case.

Moog recently invested in an

additive manufacturing business, Tim

Wutz told us. It is a company called

Linear Mold and Engineering, of which it

has acquired a 70% stake.

Based in Livonia, Michigan, Linear has

120 employees and specialises in metal

additive manufacturing. The company

provides engineering, manufacturing

and production consulting services to

companies across a wide spectrum,

including the unmanned vehicle industry.

Kokam announced a new battery

at Xponential for UAV use. It has a

lithium-polymer chemistry originally

developed for military use, now available

for commercial applications.

Ike Inkwan Hong told us that the battery

“has an energy density of 265 W/h/kg

compared with 180-200 for established

technology. That means 30-40% more

energy for the same weight, so saves 30-

40% space and creates more flight time.”

Ike Inkwan Hong added that batteries

of similar technology were chosen for the

Solar Impulse project’s round-the-world

solar-powered aircraft.

Unmanned Systems Technology

| June/July 2016

The VersaSync time and frequency

system, from Spectracom