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Q: How did Czarnowski form his hypothesis about the flap engines?
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What observations led Czarnowski to form his hypothesis about marine propulsion?

MIT researcher James Czarnowski made observations of penguins swimming. He observed how quickly and easily the penguins moved through the water. By 1997, he had designed a "flapping" propulsion system that was more efficient than propellers.


What is the plural form for engine?

engines


Why do engines get hot?

The energy produced by the engine is mostly used to power the car, but due to an imperfect design, some energy still remains in the form of heat.


Working principle of rocket engine?

A rocket engine, or simply "rocket," is a jet engine[1] that uses only propellant mass for forming its high speed propulsive jet. Rocket engines are reaction engines and obtain thrust in accordance with Newton's third law. Since they need no external material to form their jet, rocket engines can be used for spacecraft propulsion as well as terrestrial uses, such as missiles. Most rocket engines are internal combustion engines, although non combusting forms also exist.Rocket engines as a group, have the highest exhaust velocities, are by far the lightest, and are the most energy efficient (at least at very high speed) of all types of jet engines. However, for the thrust they give, due to the high exhaust velocity and relatively low specific energy of rocket propellant, they consume propellant very rapidly.


Why are heat engines important?

Heat engine is the gate way of transform thermal energy into another form of easy access energy. It allow us the refrigeration cycle and come the air condition, Popsicle and the refrigerator. It would take at least 3 times the electricity to heat up over winter compare to the transformation of electricity to heat by a heat engines. Our vehicle is operated base on heat engines principle and separated the medieval era with comfortness of modern society.