However engines are roughly linear in displacement vs power output. A 15% increase in thrust would mean you can reduce the displacement of the engine by 15% and maintain the same speed. This would be compounded by the weight savings, smaller fuel tank, etc.
However, I think there is a far less than 15% increase in thrust, and due to the super-linear loss of efficiency at the top end to get a 15% increase in efficiency for the same output level might only require a 3% or so increase in thrust at that output level.
However, I think there is a far less than 15% increase in thrust, and due to the super-linear loss of efficiency at the top end to get a 15% increase in efficiency for the same output level might only require a 3% or so increase in thrust at that output level.