BERKELEY Jet-Drive Model 12J Series
Impeller Selector
Enter your engine's shaft horsepower and primary operating RPM. The tool reads your point against the impeller demand curves and returns the largest impeller the engine can drive — the same way you'd read the original chart by hand. This chart is valid for all Berkeley 12J pump models.
Click or drag anywhere on the chart to set your operating point
The demand chart is hidden on small screens for legibility. Enter your SHP and RPM below to get a recommendation — view on a larger screen to see the full curve plot.
Operating Point
SHP
RPM
Recommended Impeller
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Curves digitized from the original Model 12J chart and other notes; demand modeled as SHP ∝ RPM³. Above 500 HP requires a stainless impeller. Treat as a planning aid not an bulletproof choice. Differences in boat weights, boat lengths, hull types and engine models may require different impeller choices than this tool will provide.