Why Helicopter Has Two Propeller - DriveSpark DriveSpark

Sinooutput patent Isuzu propulsion system from 20-75hp. Model SINO-ME23, Engine 23KW/1800rpm, Gearbox ratio 1.88:1, Shaft length: 1200mm,Propller: bronze CU3, 4 blades dia 400mm. Sinooutput

Sinooutput patent Isuzu propulsion system from 20-75hp. Model SINO-ME23, Engine 23KW/1800rpm, Gearbox ratio 1.88:1, Shaft length: 1200mm,Propller: bronze CU3, 4 blades dia 400mm. Alice Yan

how to make a small rc boat at home by own maker1 own maker1