Concept2 Drag Factor & Damper Calculator
Dispel the "Damper 10" myth. Discover your true flywheel drag factor across RowErg, SkiErg, and BikeErg with environmental adjustments for elevation and cage airflow.
Within optimal competitive & physiological sweet spot (matches Olympic & world championship race standards).
How to Check True Drag Factor on Your PM5 Monitor
Never trust the damper lever number alone. Two Concept2 ergs in the same gym can produce completely different drag factors at damper 4. Always verify on the monitor before beginning your session:
- 1Press Main Menu
Power on the PM5 monitor or press Menu to return to the home screen.
- 2Select "More Options" → "Display Drag Factor"
The monitor screen will display a large zero and wait for flywheel rotation.
- 3Take 4 – 5 Full Firm Strokes
Row with your natural drive speed. The monitor will calculate the precise rate of flywheel deceleration and display your true drag factor number.
- 4Adjust the Damper Lever until Target is Reached
Move the lever up or down until the PM5 displays your target (e.g. 130 for Heavyweight Men, 120 for Lightweight Men).
Competitive Drag Factor Guidelines (World Rowing Standards)
Elite rowers and Olympic champions do NOT row on damper 10. National federations (USRowing, British Rowing, Rowing Australia) mandate strict drag factor ceilings for official 2k ergometer testing:
| Athlete Category | Target Drag Factor | Typical Damper (Sea Level) | Water Equivalent |
|---|---|---|---|
| Heavyweight Men (>75kg / 165lbs) | 125 – 135 DF | 4.0 – 4.7 | Eight (8+) / Quad (4x) |
| Lightweight Men (<75kg / 165lbs) | 120 – 130 DF | 3.6 – 4.4 | Four (4-) / Double (2x) |
| Heavyweight Women (>61.5kg / 135lbs) | 115 – 125 DF | 3.2 – 4.0 | Eight (8+) / Four (4-) |
| Lightweight Women (<61.5kg / 135lbs) | 110 – 120 DF | 2.8 – 3.6 | Double (2x) / Single (1x) |
| Junior Rowers (U17) | 105 – 115 DF | 2.4 – 3.2 | Coxed Quad (4x+) / Trainer |
| Masters Rowers (50+) | 110 – 125 DF | 2.8 – 4.0 | Single (1x) / Headwind |
The Physics of Concept2 Flywheel Damping
Many fitness enthusiasts mistake the damper lever for a weight stack on a leg press machine, assuming that setting the damper to 10 provides a "better" or "harder" workout. In reality, the damper functions like bicycle gearing or the hull shape of a boat.
Why Damper 10 Increases Injury Risk
At damper 10, the louvers are wide open, maximizing airflow into the flywheel housing. As soon as you stop pulling at the finish, the wheel decelerates abruptly. At the catch, the flywheel is moving very slowly, forcing your lumbar spine, intercostal muscles, and lower back to absorb maximum initial torque before momentum begins.
How the PM5 Measures Power Independently of Damper
The Concept2 Performance Monitor does NOT assume a fixed resistance. On every single recovery phase, the monitor samples flywheel deceleration over time (k = Δω / Δt) to calculate the exact drag factor. Whether your damper is at 3 or 10, pulling at 250 Watts requires the exact same physiological power output.
Connect your Concept2 Logbook to MyNextRow
MyNextRow audits every workout stroke-by-stroke, monitoring drag factor consistency, stroke rate adherence, and cardiovascular drift. Free forever.