Windy have a 1.5hp, 4-cycle gasoline engine, compared with most of these machines driven by 2-cycle engine, which drive a rotary vane pump to discharge air through the nozzle Over 90%of particle size sprayed from this machine are below 20, thus creating great effects even with small amount of chemicals at 1~10%, compared with ordinary sprayers.   Most effective droplet size for flying insects, less than VMD 20 Powered by HONDA 4-cycle engine Connected by a clutch drum in direct Air pump with two rotational vanes Simple design and structure