The new e-flite electric retracts come in a size that is suitable for size 10 to 15 aircraft. They say that that is an airplane up to 4.5 pounds. What is the definition of a 10 to 15 airplane and a 60 to 90 airplane. I understand that it was originally based on engine size.

In the electric EDF jets there is a very large jet called the Eurofighter. It weighs 5 pounds. Since the jets have smaller wheels, would the size 10 to 15 retracts be suitable for this large jet? Thanks