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Old 11-05-2014, 03:54 PM   #30 (permalink)
RustyLugNut
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That is a simplistic analysis.

Quote:
Originally Posted by serialk11r View Post
Except it would knock and the engine wouldn't be any more efficient than plain old gasoline?
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.
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