Unmanned Systems Technology 004 | Delair-Tech DT18 | Autopilots | Rotron RT600 | Unmanned surface vehicles | AMRC | Motion control | Batteries

46 into the side plate there is no significant oil pressure. There is no requirement to mix the oil with the fuel, two-stroke style (note though that the oil system is likewise total loss). On the outside of each side plate is the rotating counterweight that cancels out vibration attributable to the respective rotor. Each engine has its balance weights individually drilled for optimum balance. Air cooling Both the LCR and the XE versions of the RT600 have cooling air fed through the rotors. With the LCR version the incoming charge air is ducted through axial cooling fins in each apex of the rotor before flowing to the inlet ports. The engine is naturally aspirated, and each induction stroke is exploited to pull its charge in through the rotor cooling system. On each side of a twin-rotor LCR is a throttle body fed through an air filter. It contains a servo-operated butterfly, and just below that is the fuel injector. The air- fuel charge is then fed into the respective side plate, from which it passes through the middle of the adjacent rotor into the centre plate. The charge flows from the left and right side plates through the respective rotors and combines in the centre plate, which in turn feeds a common external plenum spanning the width of the two rotor housings. The respective rotor intake port is fed from one end of the plenum via an inlet tube. Each rotor is sandwiched between plate walls that have a ‘lemon’ shape aperture through which the eccentric shaft passes. The aperture is an area never exposed to the exterior of the rotor, consequently Autumn 2015 | Unmanned Systems Technology Dossier | Rotron RT600 UAV rotary engine The RT600’s rotor housings Engine preparation at Rotron