A coaxial twin propeller model helicopter comprises a power assembly, a twin propeller rotation assembly, a tail rotation assembly, a motor assembly and a gear assembly. The twin propeller rotation assembly comprises a main rotation assembly and a minor rotation assembly. The power assembly comprises a motor assembly having a motor, a motor gear, and a fuel tank and a gear assembly having a main gear, a synchronous belt gear and a belt pulley. The main gear is engaged with the motor gear, and connected to the main rotation assembly. A lower part of the main gear is connected to the synchronous belt gear which connects to said minor rotation assembly. An upper end of the belt pulley is connected to said tail rotation assembly. A middle part of the belt pulley is engaged with the main gear. A lower end of the belt pulley is connected to the synchronous belt gear.
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