RPM vs. G-Force
| Metric | What It Measures | Useful for Comparison? |
|---|---|---|
| RPM | Rotational speed only | No — meaningless without rotor diameter |
| G-Force (RCF) | Actual separation force (multiples of gravity) | Yes — the correct metric |
The Engine Analogy
A model airplane engine (COX .049) runs at 17,000 RPM yet produces only 0.08 hp. A large stationary diesel turns at 60–200 RPM and may produce over 100,000 hp. Speed alone means nothing without context. The same is true for centrifuges.
Key Principle
- G-force = centrifuge 'horsepower' — the actual working power
- A small rotor at high RPM may produce less G-force than a large rotor at low RPM
- G-force scales with the square of rotor speed AND with rotor radius
US Filtermaxx G-Force Ratings
| Model | Rated G-Force |
|---|---|
| US Filtermaxx 2400G | 2,400 × gravity |
| US Filtermaxx 3000G | 3,000 × gravity |
| US Filtermaxx 10,000G (variable speed) | Up to 10,000 × gravity |
What to Ask When Buying
Always request the rated G-force. If a manufacturer cannot provide it, they either do not know (poor engineering) or the figure is unfavorable. A properly engineered centrifuge is designed from the G-force specification outward — frame, spindle, bearings, and motor are all sized for that rated force.
Note: G-force, not RPM, is the specification that determines whether a centrifuge will effectively clean your oil, separate emulsions, or harvest algae.