He conceded that the engines had proved 28 long tons ( 28 t ) heavier than had been designed for .
The ship had been some 20 long tons ( 20 t ) over her design weight of 450 long tons ( 460 t ) when she set out .
He conceded that the engines had proved 28 long tons ( 28 t ) heavier than had been designed for and the ship had been some 20 long tons ( 20 t ) over her design weight of 450 long tons ( 460 t ) when she set out .