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In what season of the year can a helicopter climb to the highest altitude and lift the greatest load?
Answer 1» The air density is higher in winter than in summer. With increase of the air density the induced power required for hovering decreases while the engine power increases. Consequently, in the winter the
excess power AN = N.. – N is greater, which leads to increase of the avaxl req ° ’
static ceiling and lifting capability of the helicopter.
Answer 2. The air density is higher in winter than in summer. Increase
of the air density leads to increase of the power required = m^^F (wR)^.
This means that the excess power AN = N.. – N decreases, and this leads to
avaxl req ’
reduction of the static ceiling and lifting capability of the helicopter.
Answer 3. The air density is higher in winter than in summer. With increase of the flight weight it is necessary to increase the main rotor thrust force, but this involves increase of the reactive moment, which will be the larger, the higher the air density. The conclusion is that in the winter the helicopter must develop more power than in the summer, i. e., the helicopter lifting capability and static ceiling decrease in the winter.
