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Old 03-22-2011, 06:50 PM   #1
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4 blade vs 3 blade props, is this a way of over-propping?

And will it harm my engines?
Now i know whey i have EGT gauges...

Anyone have experience with this?
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Old 03-22-2011, 07:10 PM   #2
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Re: 4 blade vs 3 blade props, is this a way of over-propping?

As with any prop, they are fine as long as you have the correct pitch for the boat / engine / transmission setup.

Ted
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Old 03-23-2011, 05:03 AM   #3
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Re: 4 blade vs 3 blade props, is this a way of over-propping?

Overproping is the intentional "overloading" (the engine will no longer be able to reach max rpm ) to increase the engines efficiency at a lower ,power setting.

Adding an extra blade is not the best solution as 4 blades are not as efficient as 3, if the 3 has sufficient blade area.

For a cruiser who understands the process a cruising prop can save large amounts of fuel and extend the engine life.

For the uncomprehending it can harm the engine.
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