This question already has an answer here:
The people from cruiser-feeder started a project called RECREATE.
However, for the concept with fuel transfer from feeder to cruiser (civil air-to-air refuelling operations), the results of our collaborative research indicate a fuel burn reduction potential on isolated aircraft level between 11% and 23 % for a typical 6000 nautical miles flight with a payload of 250 passengers.
That sounds very good, doesn't it? I answered this question about civil air-to-air refuelling with the cruiser feeder concept. A User said:
with the Breguet equation it is easy to see that the savings are modest.
This concept will never be certified
They even created a high-realistic simulation environment in which they tested the refuelling-process with real pilots as you can see in this video.
The feedback from the pilot is very good and promising that the concept might become real.
I'm curious why the savings are modest, because the planes can reduce the fuel burn from 11% to 23% and why this concept will never be certified.
Can the cruiser-feeder concept become real? That a feeder pumps fuel to a cruiser after he took of?
When does the use of the feeder burn more fuel than it saves?
What could stand in the way to make the RECREATE Project become real?