Unmanned Systems Technology 042 | Mayflower Autonomous Ship | Embedded Computing | ElevonX Sierra VTOL | UUVs insight | Flygas Engineering GAS418S | Ocean Business 2021 report | Electric motors | Priva Kompano

Robot Aviation SkyView GCS ONE SOFTWARE FOR ALL UNMANNED NATO STANAG 4586 MULTI-VEHICLE & PAYLOAD CONTROL ADVANCED & CUSTOMIZABLE   FIELD PROVEN & SAFE MAVLINK COMPLIANT DEVELOPER KIT AVAILABLE www.robotaviation.com Reventec FLY FURTHER. FLY LONGER. Optimize your mission with a precision fuel level sensor you can trust. (-\ Accurate Compact Lightweight Reliable reventec.com/uav +44 (0)1725 510 321 [email protected] Combustion The GAS418S features two cylinder heads – one covering each pair of cylinders – with minor dimensional differences between the left and right heads. These account largely for the valve placements and ensure the camshaft can actuate all four intake and exhaust valves with just four cam lobes rather than eight. These, along with almost all the components in the engine, are cast and then machined to exact shapes. This is more expensive and potentially more time-consuming than cutting components from billet, and makes customisation more challenging (given the need to design and manufacture moulds for each part). “However, it ensures that the metal forms more strongly than billet,” Zucchini explains. “When you water- cut stock aluminium, you damage the crystalline structure and weaken its mechanical integrity. “And honestly, there are maybe five choices of aluminium grades when it comes to commercial bar stock. When you choose to cast, you can choose from hundreds of grades.” The cylinders themselves have a bore of 92 mm and a stroke of 68 mm; with four cylinders, that makes for a total displacement of 1.8 litres (450 cc per cylinder). As is to be expected for a largely symmetrical boxer, they fire in a 4-3-2-1 order, alternating between left and right to minimise vibration, with a combustion event at every 180 º turn of the crank. Cast iron cylinder liners are integrated, primarily for their rigidity, although Gamberini lauds the benefits of using nickel silicon carbide coatings as an alternative lining and suggests that Flygas might opt for the latter in the future. Three standard piston rings – two for compression, one for oiling – seal and lubricate the cylinders. Flygas Engineering GAS418S | Dossier We use two spark plugs in each cylinder, as we wanted an EFI system that would keep a cylinder firing on one plug if the other failed C M Y CM MY CY CMY K UST-Jan-2020-Final.pdf 1 04/02/2020 20:26