NACT Engineering

Using of Tethered Drone System

Drones are deemed as one of the most versatile robots available today. Many equipment and sensors can be mounted to the drone to enable many different applications and solutions spanning across many sectors. The applications are only limited by imagination and drone physical limitations.

Drone limitations are well known to be of:

  1. Limited flight time and endurance
  2. Limited power capability for power hungry payloads
  3. Loss of thrust maximum thrust during operation as battery voltage reduces
  4. Susceptibility to jamming and interference affecting reliability and repeatability of results

The root cause of the limitations is due to the physical constraints of the energy source, in most cases, the lithium battery. Other causes revolve about the reliability of signal and surrounding interferences that can affect aircraft antennas even in the case encryptions are used.

With the rise and rapid popularity of drones, drone jamming devices are getting traction as well. One can easily acquire a practical jamming device from commercial and internet sources and severely disrupt drone operator operations. Besides the widespread availability of jamming devices, many new cities are built with power transmission cables and wireless communication devices embedded into the ground, walls, and buildings, affecting the reliability of drone signals, resulting in drone inability to take off, or in severe cases, crashes.

The use of Tethered Drone System

The essence behind a good performing multirotor UAVs is the ability to instantaneously adjust motor rotational speed so as to correct positional errors as fast as possible. This requires a power source with a stable voltage. The more stable the voltage, the better the response, resulting in a more stable flight performance.

The concept of Tether Drone System will address the matter by:

  1. Utilizing energy sources on the ground, thereby decoupling the stringent weight requirements of energy sources on the UAV.
  2. Using electrical cables to provide the power tether medium, which serves as a reliable medium of power transfer from ground to the UAV. At high enough voltage, the electric tether cable can be relatively lightweight so as to allow a longer operation distance from the source.

Additionally, the UAV can utilize the electrical tether cable to

  1. Provide a faster means of data transfer between the ground and aircraft.
  2. Provide un-jammable control signal from ground to aircraft, improving flight safety against hostile environmental.
The advantage of using NACT Tether Power Solution

Nact tether power solution had operated for many Singapore government agencies and has been awarded waivers to operate in no-fly zones. This is because Nact electric tether power systems are considered safe for use in critical airspace, with redundant electrical power and safety systems in place for the most important missions.

Nact Tether Power Systems come with:

  1. Ground batteries and/or adapter for mains power
  2. Reliable ground power systems built to Mil-Std 810
  3. Reliable tether power and data cable
  4. Proprietary adjustable constant tension winch for multiple mission and terrain uses
  5. Reliable aircraft power card built to Mil-Std 810 and 704
  6. Option of backup battery for aircraft redundant reliable operation

Nact differentiates ourselves from the competition as we have the highest power density aircraft power card, at very high voltages of up to 6000V. We are able to deliver solutions up to 20W/g, which can be much lighter than the original battery weight (inclusive of the tether cable), allowing the UAV to carry more payload than it originally could.

At Nact we house some of the best UAV specialists in the world. We build and support developments of micro-UAVs to those of large scale. We develop many solutions to support different customer drones, inclusive of avionics-power card link, all successfully demonstrated with zero failures to date. Our Aircraft Tether power module carries not only the propulsion power, but also auxiliary voltages for electronics and payloads, inclusive of voltage and current monitoring devices for the best possible UAV integration.

Contact us at if you want to find out more about tether drone system.

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Mr Ooi Joon Hin

Board Director

Mr. Ooi is a director of Millennia-VFT Ventures Pte Ltd, and a managing director at Millennia Investment Management Pte Ltd, with more than two decades of investment management and banking experience. Prior to Millennia, he was with Lehman Brothers’ Investment Banking Division from 1994 to 2002 and worked in that firm’s New York, Hong Kong, and Singapore offices. He served as Senior Vice President and Co-head of Lehman Brothers Asia Energy Group from 2001-2002 and prior to that was Vice President of corporate finance execution for Lehman Brothers’ Southeast Asian investment banking team. Before joining Lehman Brothers, he was a senior accountant with Grant Thornton in New York from 1988 to 1992

Mr Raymond Lum

Board Director

Mr. Lum is currently the Managing Director of JLB Alliance Pte Ltd, a corporate finance advisory firm in Singapore. He brings more than 24 years of experience in operations and management, of which 17 years within the technology sector. Mr. Lum led efforts in digital transformation, mergers & acquisitions, corporate planning, business operations, and international business expansion within the technology, built environment, real estate, retail, distribution and logistics & fulfilment sectors.

Prior to joining JLB Alliance, Mr. Lum was the COO of Boustead Projects Ltd, and held various roles in TeleChoice International Ltd, SIA Engineering Company Ltd, KPMG Corporate Finance Pte Ltd, Infocom-Media Development Authority, ST Electronics (Info-software systems) Pte Ltd and Squire Mech Pte Ltd.

Mr. Lum is a Senior Member of the Institution of Engineers Singapore, a Fellow Chartered Accountant of Singapore, a Chartered Accountant of the Institute of Chartered Accountants in England and Wales, and a Member of the Singapore Institute of Directors. He holds a Master of Business Administration from Nanyang Technological University (Singapore), Master of Science in Applied Finance from the Singapore Management University, and Bachelor of Engineering (Honours) from the National University of Singapore.

Mr Chang Yew Kong

Board Director

Mr. Chang Yew Kong is Chairman of SIT IAC (ICT), Chairman of Wizvision, and serves on the Boards of HTX, DSCO and Tag Team. He is also Mentor/Advisor to SMEs in various technology sectors since retiring in 2016.

Mr Chang was President of ST Electronics Limited Software Systems Group (SSG) in July 2010, comprising ST Electronics (Info-Software Systems), ST Electronics (Training & Simulation Systems) and ST Electronics (Enterprise 1). He was also President / General Manager of STEE-InfoSoft from 1997 to December 2013.

Mr Chang served in the Defence Science Organisation/MINDEF (1978 to 1985) and Data General Singapore (1985 to 1987) before joining Singapore Technologies. He held various senior management positions in the then Singapore Computer Systems Ltd (SCS) from 1987 to 1996.

Mr. Chang graduated from the then University of Singapore with a Bachelor of Electrical Engineering (First Class Honours) in 1978. He completed his Masters in Engineering and a Diploma in Business Administration in the National University of Singapore in 1982 and 1984 respectively and attended the Stanford-NUS Executive Program. Mr Chang is a Senior Member of Institution of Engineers (Singapore) and a Fellow of Singapore Computer Society.

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