propeller
penises
condoms
dock is a four letter word for a place where boats are parked.
Umm...the question is a little vague (is it for a project, are there more details?), so I'll offer as much as I find relevant. You can split it into arm propulsion or leg propulsion. You can split it into the four strokes: butterfly, backstroke, breaststroke, freestyle. You can split it into surface propulsion and underwater propulsion. Be more specific and I can help you more.
The gas engine for boats was significantly advanced by Nikolaus Otto, who developed the four-stroke engine in the 1870s. However, the first practical gas-powered boat was created by Gustave Trouvé in 1880, who demonstrated a successful electric boat powered by a gas engine. While various inventors contributed to the development of gas engines for marine use, Trouvé's work is often highlighted in the history of gas propulsion in boats.
they are public roads- cars and other vehicles, railroads- trains, airports- airplanes and other flying transportation, and ports- boats and other water vehicles.
they are public roads- cars and other vehicles, railroads- trains, airports- airplanes and other flying transportation, and ports- boats and other water vehicles.
a dock
Four on the beach, four at sea.
The four numeric systems are Roman, Alpha, Mayan, and Arabic.
campers and boats
soccer ball, oil, people, boats
The nearest jetty had four small boats tied to it.
Four to the first power is four. Any number to the first power is that number.