I have installed the Tennessee Props 2-blade wood prop on the Hirth 3202 engine that develops 55 HP at 5500 RPM.
Use the AC43-13 to set torque values and tracking data for installing propellers, and remember proper safety when working with or around propellers.
I am using a calibrated torque wrench set to 120 inch pounds for the 8mm X 80mm prop bolts; this is the mid-range for these bolts .
The 8mm bolt is equal to the SAE 5/16ths inch AN5 bolt, and is used in a shear application. Care is taken in the installation to monitor the tracking setting to within 1/16th of an inch for both blades.
Proper tracking is essential for flight safety, it reduces vibration, and aids in the long term operational life of the engine. Always follow the manufacturers installation instructions, or the AC43.13 data when installing a propeller.
I removed one spark plug from each cylinder prior to beginning work, and made absolutely certain that the ignition modules were grounded; this will prevent compression in the cylinders from turning the prop, and to prevent any potential of the engine starting..
