The paper is base on reference and gives theory method for estimating vertical drag, and for example of one helicopter, lias computed,Obtains a good agree of computing result with main rotor/fuselag wind tunnel lest result.

• 本文根据参考文献,给出估算垂向阻力的理论方法,并以某机为例进行了计算,计算结果与该机的旋翼/机身组合风洞试验结果相比,获得了很好的一致。