The University of Manchester is demonstrating fluidic controls on its Magma UAV.

Basically, it uses small puffs of air to interfere with the Coanda effect prove out-sized control effects:

A flight-test program this spring will attempt to prove supersonic air bled from an engine can provide directional control equivalent to conventional flying surfaces. The program also is aimed at investigating the potential of using exhaust vectoring to replace vertical tails. Possible applications run the gamut from enabling maneuvering with minimal impact on a radar cross-section, to increasing lift on heavy transport aircraft.

Magma, a project run by the University of Manchester, England, and supported by BAE Systems, attracted attention late in 2017 when its first flight was revealed. The September flights were with conventional control surfaces on the subscale unmanned aircraft, and mainly were concerned with establishing that a new airframe built to test fluidic-control technologies behaved as expected. Further flights, planned for late spring, are intended to demonstrate not just that these technologies work, but could in theory be inserted or removed from platforms quickly and easily.

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The idea of using pressurized air from the engine to aid aircraft control has been around for some time. The Blackburn Buccaneer strike aircraft’s boundary-layer control system used air blown over the wings to assist carrier landings and increase control at low speeds, but Magma benefits from techniques and technologies that were unavailable during past programs.

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“The air sticks to that rounded surface,” says Bill Crowther, a reader at the university and the Magma project’s academic lead, “but it also drags in the other air around it. So it acts like a virtual flap, without moving anything.”

Cool.