Use our Suzuki Prop Calculator to choose the ideal prop size and pitch. Boost speed, fuel efficiency, and overall performance of your outboard engine.
Propeller Results
| Metric | Value |
|---|---|
| Propeller Diameter | |
| Propeller Pitch | |
| Propeller Slip | |
| Propeller Material |
| Marking Example | Description |
|---|---|
| 3 x 13 x 18 | 3 blades, 13″ diameter, 18″ pitch |
| 4 x 14 x 20 | 4 blades, 14″ diameter, 20″ pitch |
How to Use
- Horsepower: Enter Suzuki outboard HP (e.g., 25 HP, check engine manual, 2.5–300 HP).
- RPM: Use max RPM from Suzuki specs (e.g., 5500 RPM for DF25A).
- Gear Ratio: Find in Suzuki manual (e.g., 2.08:1 for DF25A).
- Desired Speed: Enter cruising speed in knots (imperial) or kph (metric).
- Boat Weight: Estimate total weight (hull, engine, gear) in lbs (imperial) or kg (metric).
Understanding Results
- Propeller Diameter: Width of prop circle (inches/cm). Suzuki predetermines based on engine size.
- Propeller Pitch: Distance prop moves per revolution (inches/cm). Higher pitch = faster, lower = quicker acceleration.
- Propeller Slip: Efficiency loss (10–20% typical). High slip (>20%) indicates poor prop match.
- Propeller Material: Aluminum (2.5–60 HP) for cost; stainless steel (>60 HP) for performance.
- Fit Tips: Ensure prop fits Suzuki gearcase and operates within RPM range (Web ID: 2).
Common Issues
- High Slip (>20%): Prop too small or pitch too high; try larger diameter or lower pitch.
- Over-Revving: Pitch too low; increase pitch by 1” (≈150–200 RPM drop).
- Under-Revving: Pitch too high; decrease pitch by 1” (≈150–200 RPM gain).
Suzuki Prop Calculator – Choose the Right Propeller for Your Outboard
The Suzuki Prop Calculator helps you find the ideal propeller size, pitch, and slip based on your boat’s setup. By entering key details like engine horsepower, RPM, gear ratio, and boat weight, you can quickly estimate the perfect prop configuration to maximize speed, fuel efficiency, and overall performance.
How the Suzuki Prop Calculator Works
Simply input the following data into the calculator:
- Engine Horsepower (HP): Rated power of your Suzuki outboard.
- Engine RPM: Maximum wide-open throttle RPM.
- Gear Ratio: Your engine’s gearcase ratio (e.g., 2.08:1).
- Boat Weight: Total weight including hull, fuel, passengers, and gear.
- Desired Speed: Target cruising or top speed.
Once entered, the tool calculates the recommended propeller diameter, pitch, and estimated slip, giving you a precise starting point for selecting or upgrading your propeller.
Example Propeller Results
Here are a few sample outputs based on different setups:
| Boat Setup | Recommended Prop | Slip Estimate |
|---|---|---|
| 25 HP – 5500 RPM – 2.08:1 – 250 kg | 3 × 13 × 18 | ~12% |
| 75 HP – 6000 RPM – 2.5:1 – 600 kg | 3 × 14 × 20 | ~15% |
| 100 HP – 6000 RPM – 2.0:1 – 900 kg | 3 × 15 × 22 | ~18% |
Why the Right Propeller Matters
- Prevent Over- or Under-Revving: A matched prop keeps your engine in its ideal RPM range.
- Boost Efficiency: Better pitch and diameter improve speed and fuel economy.
- Optimize Slip: Ideal slip ranges between 5%–20% for most setups.
- Improve Handling: The right prop ensures smooth acceleration and stable cruising.
Tips for Best Results
- Always include total weight (boat, passengers, fuel, gear) for accurate results.
- Use your engine’s official WOT RPM range for correct pitch calculations.
- If slip is high, try increasing diameter or reducing pitch.
- Combine calculator output with real-world testing for final selection.
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Conclusion
The Suzuki Prop Calculator simplifies prop selection, giving you accurate recommendations in seconds. With the right prop, you’ll enjoy better speed, smoother handling, improved fuel efficiency, and longer engine life. Use the results as a starting point and fine-tune with real-world testing for the best performance on the water.