Quote:
Originally Posted by serialk11r
Except it would knock and the engine wouldn't be any more efficient than plain old gasoline?
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Orbital of Australia has an engine in development to replace the engines in military drones. This would remove the last need for aviation gasoline from the United States Military Logistics.
A balanced engine would have direct injection to provide an early injection event that introduces a sub critical amount of fuel (below combustible limits) followed by an injection closer to spark initiation. This would provide a mix of vaporized fuel and a rich cloud for ignition. No throttle would be necessary resulting in reduced throttle losses. The increased fuel density would be an advantage. The only detriment in comparison to a true diesel is the loss of efficiency due to decreased compression (13:1 compared to 15:1 and above for diesels). Increased thermal efficiency could be derived by use of the Atkinson Cycle but specific horsepower per weight is important to aircraft so a compromise in design is still an advantage over the original engine via improved logistics and longer flight times.
For Ecommoders, it could mean waste fuels could be used in a wider range of vehicle types.
Dustyfirewalker has a thread that may not succeed but his youthful energy is contagious to watch. But, his premise is sound. If you have a source of waste oil, why not burn it in your engine? The economy is largely immaterial as the fuel is essentially free.