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General Information
Boat Location
Boat Information
(in Pounds)
(in Feet)
Current Engine Data
Current Engine Data
Current Engine Rating Information
Maximum rated brake horsepower and RPM: This information should come from the engine manufacturer's specifications. In a propeller sizing we must use the maximum rating to ensure that the engine will not be in danger of being overloaded by the propeller. A propeller sized to a continuous rating (a lower power rating) may result in engine overloading and eventually engine damage.
If the engine is governed, at what RPM? Diesel engine manufacturers use devices to limit the engine RPM to avoid engine over-speed. An engine is typically governed above the engine maximum rated RPM.
: 1
Gear Ratio: This information can usually be found in a manual, or stamped into a placard located on the actual transmission. The gear ratio determines the optimal propeller size and thus the exact gear ratio is required to generate an accurate propeller sizing.
Old Engine (Only for Repower Analysis)
Old Engine Data
Old Engine Rating Information
(Maximum Rated Brake Horsepower and RPM: This information should come from the engine manufacturer's specifications. In a propeller sizing we must use the maximum rating to ensure that the engine will not be in danger of being overloaded by the propeller. A propeller sized to a continuous rating (a lower power rating) may result in engine overloading and eventually engine damage.)
(If the engine is governed, at what RPM? Diesel engine manufacturers use devises to limit the engine RPM to avoid engine over-speed. An engine is typically governed above the engine maximum rated RPM.)
: 1
(Gear Ratio: This information can usually be found in a manual, or stamped into a placard located on the actual transmission. The gear ratio determines the optimal propeller size and thus the exact gear ratio is required to general an accurate propeller sizing.)
Propeller Data
Please specify Inches or Metric (MM)
Maximum Propeller Diameter

Lack of adequate clearance between the propeller blade tips and the hull can create excessive noise and vibration, and possible decreased performance. If you know the vertical distance from the propeller shaft to the hull bottom, inthe region where the propeller would be located, we can determine the maximum propeller diameter.

Enter desired maximum propeller diameter above. If that is unknown, please enter the distance from the propeller shaft to the hull below:
Please specify Inches or Metric (MM)
Wide Open Throttle RPM

The RPM data should be read from the vessel's tachometer and the speed data should be read from the vessel's speedometer or GPS. The performance information is critical in determining how well the current propeller is loading the engine.

Additional Comments

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Request a Propeller Sizing Analysis

Choosing the right propeller for your boat requires several pieces of information to allow us to give you the best suggested propeller size for your boat and engine combination. By providing us with this information, we can complete a propeller analysis for you.


Inboard Resources

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