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Thx for your input Dragon.

Hmm, the total efficiency of a propulsion system can be calculated if the efficiency factors of each component is known. Please correct me if I'm wrong:

For example a simple electric propulsion system consisting of

1) battery (0.9)

2) speed controller (0.85)

3) motor (0.8)

4) propeller (0.75)

By multiplying the individual factors (0.9x0.85x0.8x0.75) we get the total efficiency.

In my example only 46% of the battery power drawn is converted into actual useful power! (my factors are guesstimated, but the result seems plausible)

In order to achieve an overall efficiency of 65%, each individual component must have an efficiency of 90%...quite a challenge