FF
Guru
- Joined
- Oct 12, 2007
- Messages
- 22,552
Over propped ,a prop not chosen to spin at peak rated RPM , does NOT mean the vessel is overloading the engine.
Each engine has a long term proper rating at most rpm below full tilt .
Most eng mfg provide a graph.
Operating at 40 hp on our 50 hp at that rpm rated engine INCREASES engine life , and lowers fuel burn too.
The best place to look for acceptable low rpm loading is at the graph for the engine when selected for use as a generator.
Usually 1200, 1500 and 1800 will have suggested loading that the eng mfg finds safe 24/7 .
Operating at 1200 or 1500 at rated loading is far kinder on the engine than proping for never used WOT and pulling back to minor hp at high rpm..
Each engine has a long term proper rating at most rpm below full tilt .
Most eng mfg provide a graph.
Operating at 40 hp on our 50 hp at that rpm rated engine INCREASES engine life , and lowers fuel burn too.
The best place to look for acceptable low rpm loading is at the graph for the engine when selected for use as a generator.
Usually 1200, 1500 and 1800 will have suggested loading that the eng mfg finds safe 24/7 .
Operating at 1200 or 1500 at rated loading is far kinder on the engine than proping for never used WOT and pulling back to minor hp at high rpm..