Page 116 - The phenomenal demographic and technological changes in the 21st century

energy per unit of mass of any source known. It must be noted that controlled

atomic energy has already produced electric power and marine propulsion power.

5. Another possible problem considered in any engine is its flexibility. Flexibility

is the ability of the engine to run smoothly and perform properly at all speeds and

through all variations of atmospheric conditions.

6. One more important problem worked at by the designers is the engine reliability.

The engine is to have a long, with maximum of time between overhaul periods.

7. It must be emphasized that in some cases the problem of balance is one of the

main. Balance has several possible meanings but the principle factor is freedom

from vibration. Besides any engine must be started easily and carry its full load in

a few minutes. The necessity of carrying away excess heat developed by the engine

has always been a problem of first importance too.

8. As mentioned before the power plant is a means of propulsion. Nowadays there

exist many types of engines used for various purposes. There are gasoline engines,

diesel engines, gas turbines, steam engines, steam turbines, jet engines and rocket

engines.

КОМЕНТАРІ ДО ТЕКСТУ

thrust реактивна рушійна сила, натиск
weight power ratio співвідношення ваги до потужності

output потужність
overhaul капітальний ремонт

it must be emphasized необхідно підкреслити
full load повне навантаження

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