What is a device that pushes a ship or aircraft called?

What is the ratio of gas to oil for a 4 hp mercury outboard engine? What does a submarine do that a warship cannot? When are you required to fill out an accident report during boating? What is your 75 horsepower mercury outboard engine worth? What do two short horn blasts form another vessel mean in a meeting situation? What should i do after fueling your boat and before starting the engine? What does a keep out buoy look like in the water? What instrument measures speed in boats or ships? What forces are used when a boat moves in water? What is a pedal cycle-boat called? Compound word for boat that carry cars and people? What is the fuel mixture for 1976 evinrude 9.9 model 10624h? Are there bathrooms on a ferry boat? Do you need a boat license with just a trolling motor in Alabama? You see a white boy with an orange crossed diamond and black lettering what does this marker tell you? What is the spine of a boat called? Water in the oil of a Chevy 350 marine engine means what? Is boat insurance required in Florida? What is required to be carried aboard a 25 power boat? What is point gap for 72 Evinrude Sportwin 9.5HP outboard?