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→Hard Mounts
=== Hard Mounts ===
In a standard mechanical-drive system, the engine is hard mounted to the engine bed because the propeller thrusts the engine A reduction-gear transmission such as [http://www.zf.com/ ZF ] reduces the engine rpm to the rpm required by the propeller. The propeller shaft is fixed, and great care is taken to align the shaft with the engine. Periodic re-alignment may be necessary.
The advantages are simplicity, low cost, reliability, ease of repair, and maximum mechanical efficiency of around 95%.
