Don't get why i am getting downvoted. What in particular can drive such a huge efficiency improvement? like, 100+ L/D ratio? Impossible. 10x more efficient engi

Don't get why i am getting downvoted. What in particular can drive such a huge efficiency improvement? like, 100+ L/D ratio? Impossible. 10x more efficient engines (especially as engine is stock one and science of propeller design has been perfected in 100 years)? Clearly impossible.