Diesel-Engine Woes Hurt Collins-Class Subs

The Australian navy has placed tight operational restrictions on its Collins-class submarines after a series of mechanical and maintenance problems, reports the Australian.

Some experts maintain that the Swedish-supplied Hedemora diesel engines may need to be replaced, a major design and engineering effort that would cost hundreds of millions of dollars and take years to finish.

Other mechanical issues affecting the subs include the performance of the electric motors,...