The last couple of years development in aircraft engines has been more or less concentrating on diesel engines. We have seen one off installations to fully developed engine production lines. A number of companies are active on this market primarily due to major concern of long term availability and the relative high price of AVgas (Europe). JET fuel (avtur) is available worldwide and can be used in diesel engines. This fuel can also be made of renewable sources (biomass) which contribute to a cleaner environment.
In the United Kingdom there are a number of aircraft diesel engine manufacturers active: Wilksch Airmotive, Diesel Air Limited and Powerplant Developments. We will shine a light on each to see what they have to offer to the experimental aircraft market.
Gemini 100 Principle of Operation.
Excerpt from the document:
Principles of operation
The above schematic view shows the basic layout of an opposed piston engine in which the combustion chamber is formed between two pistons occupying the same cylinder. Inlet and exhaust ports are formed by orifices in the cylinder walls, opened and closed by the movement of the pistons in the cylinder. Induction and scavenging are achieved by positive pressure from an engine driven supercharger.
As well as eliminating the camshaft, valve gear and cylinder head joints that are the main sources of unreliability and high maintenance activity in conventional aircraft engines the simplicity of the layout allows significant weight and cost savings to be made in a well designed opposed piston engine.
To continue reading see the pdf below: