Patrol Boat, or Patrol Craft, a small, high-speed naval vessel used for antisubmarine warfare, coastal patrol, harbor defense, and river warfare. The patrol boat classification includes motor torpedo boats, motor gunboats, fast patrol boats (successor to the PT boats [torpedo patrol boats] of World War II), and various kinds of river patrol boats. (Exact designations vary from navy to navy.) Patrol boats are generally about 75 feet (23 m) long, displace less than 100 tons, and carry crews of 11 to 25 men. Many are capable of speeds of better than 40 knots. Hydrofoil patrol boats, which travel on underwater foils (similar to aircraft wings) rather than on their hulls, travel even faster.
The Nieuport 17 incorporated the best features of monoplanes and biplanes in what was termed the sesquiplane setup. It featured a large top wing and a smaller lower wing joined by a V-shaped strut. Learn the advantages of this classic hybrid design.
The Lockheed SR-71 Blackbird first flew in 1964, and since that time it has remained the world's fastest aircraft. Tanks in the inner wings and upper fuselage carry the 80,000 pounds of special, superheated fuel.