As to the selection of rotorblade number for light and medium helicopter, 4 blade and 5 bladerotor are typical.
而旋翼桨叶片数的选择，对轻型和中型直升机来讲，4片桨叶旋翼和5片桨叶旋翼具有典型意义。
2
The comparative tests of the pinrotor with conventional two bladerotor in a domestic internal mixer were reported.
本文介绍了在国产密炼机上采用销钉转子和普通二棱转子进行对比试验的情况。
3
Then there's increasing the number of rotor blades. This helps because each additional blade carries less of the weight of the helicopter, and thus produces less noise.