justifidejoe
Well-Known Member
Does anybody know if there a well-established winner (theoretically and in practice) in terms of prop efficiency between the following scenarios (for a twin engine aircraft)? Let's ignore the pusher vs tractor aspect. Also let's ignore the weight/complexity penalty of the gearbox and contra-props.
- Combining gearbox to a single prop
e.g. the LearFan
- Contra-rotating propellers, each connected to a different engine
e.g. the XB-42
- Independent props, as is most conventional
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