Tugboat, or Tug, a boat with a powerful engine used to tow or push ships and barges. Tugboats are usually small and are used mainly in harbors, rivers, and canals. They are generally about 100 feet (30 m) long and about 25 feet (8 m) wide. Most tugs use diesel or diesel-electric engines of up to about 2,000 horsepower. Larger, oceangoing tugs, up to about 300 feet (90 m) long, are used to aid disabled ships.
Air University, the center for the professional education of officers and senior noncommissioned officers of the United States Air Force.
The four-engine Boeing B-17 Flying Fortress was almost certainly the best-loved bomber of World War II. Despite the plane's superiority, Congress didn't authorize its purchase in quantity until war was certain. Learn the story and specs of the B-17.