A new thrust in DERA micro air vehicle development

DERA has successfully produced and demonstrated a tiny powerplant for micro air vehicles (MAVs). Known as "Microjet", this 13mm long hydrogen peroxide fuelled engine is designed for the development of micro air vehicles for use in both military and civil surveillance operations.

The soldier of tomorrow may carry a number of these air vehicles as standard equipment for use in peering over hilly terrain or surveying enemy territory and jamming communications. In civil applications, inspection surveys of areas difficult to reach by other means will be possible.

Until now, no suitable form of propulsion system has been identified to power these tiny craft which have a wingspan of only 6 inches. Most attempted solutions have involved the use of either electrically driven propellers or model aircraft engines. These are either too bulky and heavy or do not provide sufficient flight duration.

By mixing the hydrogen peroxide with kerosene or a similar fuel, DERA has currently achieved flight duration times of up to 1 hour. Starting and stopping the engine is very simple and is achieved by a simple on/off valve, making it reliable and simple to operate in the field. The engine may be used as a pure jet, or used in conjunction with a ducted fan to improve propulsive efficiency. At around 13mm long by 5mm diameter and a weight of less than 2 grams, a thrust of around 0.063N (0.14lbf) has been demonstrated which is more than adequate for this application. The thrust to weight ratio is an impressive 75:1 when compared to a full size gas turbine which at best is around 10:1.

The invention was the result of an internal DERA competition known as 'Challenge Air' in which a small level of funding is made available to encourage scientists to experiment with new innovations.

Microjet has been operated on a test stand to demonstrate the concept and DERA is now seeking suitable partners or companies willing to invest in its further development.

REF XQQEE XQQSE