Adding a rotor blade (it had five on the main rotor and four on the tail) and using a modified exhaust system were among them.
增加一个桨叶(主桨有5个叶片，尾桨有4个)，并使用了改进的排气系统。
The 300 holes in each blade, most of them thinner than a human hair, are engineered to spread a coat of cool air over the spinning blades so they aren't melted by 3,000f exhaust gases.
每一个涡轮机叶上有300个小孔，这些小孔大多数比人的头发丝还要细，它们会被一层冷却空气所覆盖，以免被3000f的高温所融化。
The 300 holes in each blade, most of them thinner than a human hair, are engineered to spread a coat of cool air over the spinning blades so they aren't melted by 3, 000f exhaust gases.
每一个涡轮机叶上有300个小孔，这些小孔大多数比人的头发丝还要细，它们会被一层冷却空气所覆盖，以免被3000f的高温所融化。
Shutter Mounted Industrial Exhaust Fan models are available with a blade diameter of 12 ", 18 ", 24 "or 30".
快门式工业排风扇根据型号，刀片直径分别为12英寸，18英寸，24英寸或30英寸。
Shutter Mounted Industrial Exhaust Fan models are available with a blade diameter of 12 ", 18 ", 24 "or 30".
快门式工业排风扇根据型号，刀片直径分别为12英寸，18英寸，24英寸或30英寸。
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