67 with a maximum power output of 16.5 kW (22.5 hp) at a crank speed of 6750 rpm and a peak torque output of 24 Nm at 6000 rpm. Most recently, Suter has unveiled the TOA 330 as its largest engine, developed with a 330 cc displacement instead of 288 cc to satisfy inevitable customer requests for increased power, although this system is otherwise air-cooled and 95RON gasoline-powered (with options for 91MON Mogas or LL100 Avgas), like the TOA and TOW 288. Additionally, each engine operates with a service ceiling of 6100 m (and can be cold-restarted), is digitally managed via a 12 V ECU and lubricated with two-stroke oil API TC, which burns up via combustion. However, it is promised that Suter’s portfolio will continue growing to suit the widening range of UAVs and other light aircraft being designed today, the company disclosing to us that a heavy fuel version of the TOA 330 – a HF TOA 330-SDI – is in the works. That project has not gone into production yet, and cannot be revealed in detail, but it will be once validated and made certifiable through testing. As well as having the same service ceilings (tested up to 9000 m), all four engines are spark-ignited with capacitive discharge ignition systems and EFI, controlled by an ECU that manages based on an Alpha-N strategy. That focuses on adjusting crank speed, according to throttle position and air flow (governed via a Volz DA 15-N, a servo prized by Suter for its precision, reliability and longevity), but also compensates for readings on exhaust gas temperature, cylinder-head temperature (CHT) and other readings. In addition to this fourfold expansion of its aviation engine offerings, a similar scale of change has happened at Suter Industries itself since our last investigation. While long known for its engineering services across different categories and seasons of motorsport (see boxout), the relative stability and steady growth Suter Industries | Dossier Uncrewed Systems Technology | February/March 2025 Since we last covered them in 2020, Suter Industries has advanced to series production of multiple engine models (All images courtesy of Suter except where stated otherwise)
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