A house boat with a launching device on the roof was used to launch Langley Aerodromes No. 4, No. 5 and No. 6. The use of a house boat permitted the Aerodromes to be launched into the wind, no matter from which direction the wind was blowing, and to be launched over water, which reduced the chance for serious damage on landing. A similar, but larger, house boat was built to launch the Langley Quarter-Size Aerodrome and the Langley Large Aerodrome "A." Both house boats were operated at a point down the Potomac River several of miles from Washington, D.C.