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Old 12-02-2012
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Re: Looking at a Alberg 35

Quote:
Originally Posted by cupper3 View Post
Can you expand on that? Maximum torque and hull speed doesn't intuitively make sense.
No? I think it does - torque is the "grunt" that actually pushes your boat - horsepower is only torque delivered over time. When you step on the gas at a light, it's torque that pushes you back in your seat (and please don't say it's inertia, I know that subtlety )

The peak torque RPM is where a diesel is most fuel efficient so having it placed to coincide with a boats hull speed is going to give you the best "gas mileage".

Stationary engines chug along around their torque peak - they are sized to do that - it's more efficient than running a larger engine slower or a smaller engine faster.

This is the basic concept behind varying or modifying a props pitch - it moves the engines RPM into a more efficient range.
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