Abstract: A cross flow rotary mower has a rotor with horizontal outer cutting edges and upwardly extending blower vanes. A conduit having upper, lower and side walls cooperates with the rotor to form a cross flow blower. The rear semi-circle of travel of the rotor is within the conduit. The inlet opens forwardly and has a lateral extent preferably as great as the diameter of the tip circle of the rotor. The cutting edges extend forward of the lower wall, and preferably the lower wall extends to the cutting edges. An extension of the upper wall extends forwardly beyond the tip circle with front and side skirt portions. Means for producing and strengthening vortex air flow are described, and also inlet air flow control vanes. A number of rotors and conduit arrangements with advantageous features are described. These include dual blower vane arrangements.