时间:2011-04-05 11:32来源:蓝天飞行翻译 作者:航空 点击:次
To view this page ensure that Adobe Flash Player version 9.0.124 or greater is installed. As the helicopter becomes light on the skids, make necessary cyclic pitch control adjustments to maintain a level attitude. When airborne, use the antitorque pedals to maintain heading and the collective to ensure continuous vertical assent to the normal hovering altitude. When hovering altitude is reached, use the throttle and collective to control altitude, and the cyclic to maintain a stationary hover. Use the antitorque pedals to maintain heading. When a stabilized hover is achieved, check the engine instruments and note the power required to hover. You should also note the position of the cyclic. Cyclic position varies with wind and the amount and distribution of the load. Excessive movement of any flight control requires a change in the other flight controls. For example, if while hovering, you drift to one side, you naturally move the cyclic in the opposite direction. When you do this, part of the vertical thrust is diverted, resulting in a loss of altitude. To maintain altitude, you must increase the collective. This increases drag on the blades and tends to slow them down. To counteract the drag and maintain r.p.m., you need to increase the throttle. Increased throttle means increased torque, so you must add more pedal pressure to maintain the heading. This can easily lead to overcontrolling the helicopter. However, as your level of proficiency increases, problems associated with overcontrolling decrease. COMMON ERRORS 1 Failing to ascend vertically as the helicopter becomes airborne. 2 Pulling through on the collective after becoming airborne, causing the helicopter to gain too much altitude. 1 Overcontrolling the antitorque pedals, which not only changes the handling of the helicopter, but also changes the r.p.m. HOVERING |