The British Navy Motor Launches were developed for Coastal Patol and Anti-Submarine duty during World War I. There were (4) primary versions. The particular design was later abandoned by the mid-1920s (with many being sold off to Foreign Navies). A typical Motor Launch was roughly 300-tons displaced, and were 75-feet long.They stood 15-feet (Beam). Most versions included a 3-pound Deck Cannon (some with Deck Machine Guns). The primary weapon systems was Mine and Depth Charge. A crew of (8) was used. Only (1) surviving Motor Launch is known to exist.