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A comment on Footage of Australian Raven Attacking a Wing Drone in Canberra, Australia. Parent comment

Re:Footage of Australian Raven Attacking a Wing Drone in Can... by Scene_Cast2 on Monday September 20, 2021 @01:01PM (#28595997)
There are different types of efficiency. I think you might be referring to power per weight, while the parent comment is talking about emissions per (unit of) power.

To dig further, you can also differentiate between peak and sustained power; MTBF, maintenance (and dollars of maintenance) per hour of operation, volume, overall environmental effect (due to lifespan and manufacturing), etc etc.

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Re:Footage of Australian Raven Attacking a Wing Drone in Can... by anonfornoreason on Monday September 20, 2021 @01:21PM (#28596237)
I am referring to both thermal efficiency, and power to fuel ratio. Meaning, for any given amount of work needed, a two stroke will produce more work for the same input of fuel as compared to an equivalent quality/design four stroke motor.

Your point is a good one though, but I think the common use case of the word efficiency, when talking about vehicles, if fuel required to produce a given amount of work (miles, horsepower, etc).

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