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REDLINE is a new engine product line of Thunder Tiger. High performance, extreme power will be the main features of this series engine. RL-53H(R) helicopter engine is the first engine in this series. With the biggest displacement and awesome power, RL-53H(R) is the best choice nitro power plant for your .50 size heli model. Install the new RL-53H(R), you will get the extreme power you never experience before!! New REDLINE series engine Biggest displacement with large power in the .50 class heli engine Fix type Carb. Installed with thermal Isolator gasket construction Ringed piston with XC2 cylinder construction Push-Pull throttle lever Anodize Machinery Cylinder Head LU Type RR Ball Bearing Reinforce beam structure