Unmanned Systems Technology 023 I Milrem Multiscope I Wireless charging I Logistics insight I InterGeo, CUAV London & USA show reports I VideoRay Defender I OS Engines GR400U-FI I Ultrabeam Hydrographic Ultra-2 I IMUs

68 A safety valve is built into the fuel pump. The ECU controls the pump according to the data from the pressure sensor so as to maintain a consistent fuel pressure. Using this system, there is no need for an excess fuel return line. The ignition is of the CD type; it fires a 10 mm spark plug. The EC-11 ECU has a 32-bit CPU. It controls the fuel pump, ignition timing and the throttle, while the injector driver is incorporated into it. The EC-11 also controls the injector in respect of readings of throttle opening, crankshaft speed, intake manifold pressure, atmospheric pressure, intake air temperature and cylinder head temperature. A Hall effect crankshaft speed sensor is used, with its wheel located immediately behind the generator drive pulley. The manifold pressure sensor is located on the rear mounting flange and has a tubular connection to the intake manifold. The OGA-100 generator is three-phase AC with a maximum output of 100 W and a 20 minute continuous rate of 60 W. It is accompanied by a patented open- type regulator rectifier, the ORF-200. This stabilises the output of the OGA-100 and converts it to DC. The ORF-200 regulates the output according to the input voltage from the generator and the output of its DC conversion. Thus the generator supplies only the electrical requirement over a wide range of crankshaft/generator speed, reducing mechanical frictional loses to the benefit of fuel consumption. The GF40U-FI is 222.5 mm long, 183.8 mm tall and 118 mm wide. Its maximum output is 2.66 bhp at 9000 rpm and it is rated to a 3000 m altitude. Weight is 1.92 kg for the engine plus 1.40 kg for associated equipment (3.32 kg total) while time between overhauls is 100 hours. Since introducing the GF40U-FI, OS Engines has developed a 7.4 kW, 120 cc boxer; that is a two-stroke, since weight becomes more critical at the higher power level. Within its class the GF40U- FI four-stroke offers a very attractive compromise between weight, power and fuel consumption. December/January 2019 | Unmanned Systems Technology Dossier | OS Engines GF40U-FI Born in Tajimi, central Japan, Shigeo Ogawa (1917-1992) was interested in all things mechanical from an early age, and he studied engineering at an industrial school. Having received a special award for it at a student science model fair, he launched his Type 1 two-stroke model engine in 1936 and OS Engines Mfg Co Ltd was established in 1941. In 1984, Ogawa received a Paul Tissandier Diploma from the Federation Aeronautique Internationale. Such an award recognises those who have served the cause of aviation, and private and sporting aviation in particular, by their efforts. By that stage OS Engines was a major manufacturer of model aero engines, embracing two- and four-strokes and even a rotary produced under licence from NSU since 1968. OS Engines’ first, pioneering four-stroke was produced in 1976, and in 1980 the company even introduced supercharged versions. Fuel-injected model engines were introduced in 1999, by which time the company had been acquired by the Futaba Corporation, a major Japanese concern that includes radio control equipment among its products. Today’s extensive range of OS Engines for model aircraft and model cars includes everything from single-cylinder units to a 70 cc seven-cylinder radial four-stroke. At its base, in Osaka in central Japan, OS Engines has state-of- the-art design, development and manufacturing facilities, so it is logical that it should have moved into the UAV market. Currently it offers a range of UAV-dedicated electric motors, a horizontally opposed 120 cc two-stroke twin and the 40 cc four-stroke single described here. Background OS Engines makes its own ECU for the GF40U-FI