What Marine Engine Duty Ratings Mean To You

Fuel map for 105, 90 and 70 kW versions of the same 4 litre diesel engine

Just what is a commercial or continuous duty rating on an engine, and should you get that? Matt starts this chapter with the reason that these ratings exist, and then moves on to how to select the correct engine duty rating for a displacement boat.

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Propeller Efficiency

Matt brings his customary clarity to a complicated subject: propellers. Reading this post will cause you a bit of brain sweat, but doing so can help you get big gains in engine efficiency.

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Controllable Pitch Propellers (CPPs)

So far in this Online Book we have learned about the fundamentals of engine and propeller efficiency and, in the last chapter, we looked at a way to make our existing engines a bit more efficient. In this chapter Matt explains a much better way to get the very most out of every drop of diesel fuel.

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