What a gas-turbine Lion-class refit would require

How many gas turbines would replace the Lion class's proposed boiler machinery?

About five WR-21s, or roughly six Olympus TM3Bs, would match or exceed the proposed 130,000-shaft-horsepower plant.

The proposed Lion class needed roughly 130,000 shaft horsepower. Five modern WR-21 gas turbines would exceed the original output, while six Olympus TM3B units would reach about 150,000 shaft horsepower. Either arrangement could add speed, but the machinery, gearing, intake, exhaust, and hull work would make the conversion substantial. The watch point shows why propulsion refits must be assessed at ship scale rather than by counting engines alone.