The petrol engines are equipped with an electronic ignition system which is operated by a LiPo battery, petrol/oil mixture is used as fuel. The motors are characterized by a robust and elaborate construction, they are made for those scale model lovers who want to give their model a unique character and stand out from the rest. The motors are characterized by a robust and elaborate construction, they are made for those scale model lovers who want to give their model a unique character and stand out from the rest. The glow-ignition engines are pre-annealed with an external battery, and commercial model construction fuel based on methanol is used as fuel. Especially the small volume engines make it possible to produce smaller scale models, especially warbirds, with true originality. All engines are delivered with silencers. UMS has developed a series of five petrol engines and three glow ignition engines each, covering the entire spectrum of types required.