美国卡曼航空公司研制的单座起重吊运直升机K-MAX。其最大特点是它的两副旋翼没有采用纵列式和横列式布局,而采用的是并列交叉式布局。两旋翼轴在机体上方相距较近,且均向机体外侧倾斜。因设计已考虑了两副旋翼旋转的协调性,所以它们工作时不会互相碰撞。该机空重为2180千克,吊运重量为2700千克。 K-MAX, a single-lift crane developed by the United States Kaman Airlines. Its most prominent feature is its two rotors did not use tandem and line layout, and the use of parallel cross layout. Two rotor shaft close to the body at the top, and are inclined to the outside of the body. Because the design has taken into account the coordination of rotation of the two rotors, they will not collide with each other when they work. The aircraft empty weight of 2180 kg, lifting weight of 2700 kg.