Choosing the right propulsion system is a key decision for any yacht owner or charterer. The two most common systems — traditional shaft drive and Volvo Penta’s IPS (Inboard Performance System) — each come with distinct advantages and trade-offs. At UNICO Yachting, we help our clients make informed decisions based on real-world needs, cruising styles, and long-term ownership considerations.
Here’s how they compare across the most important criteria:
1. Maneuverability
· IPS:
IPS systems are renowned for their joystick maneuverability, offering intuitive handling and precise control. Docking in tight harbours or windy conditions becomes significantly easier — a game-changer for less experienced skippers or short-handed crews.
· Shaft Drive:
Shaft-driven yachts rely on traditional rudders and thrusters. While effective in experienced hands, they lack the finesse and ease of IPS, especially in confined spaces.
✔️ Advantage: IPS
2. Fuel Consumption & Efficiency
· IPS:
With forward-facing propellers and optimal hydrodynamics, IPS-equipped yachts often enjoy up to 30% better fuel economy than their shaft-driven counterparts. This translates to extended cruising range and lower operating costs over time.
· Shaft Drive:
Though less efficient overall, shaft drives have benefited from modern hull design enhancements. For certain displacement or semi-displacement hulls, the difference in consumption may be less pronounced.
✔️ Advantage: IPS
3. Maintenance & Servicing
· IPS:
Being a more complex system, IPS pods require specialised annual maintenance, including seal checks and underwater servicing. Repairs can be more costly, and haul-outs are often necessary.
· Shaft Drive:
Simpler and more robust, shaft drives are easier to service and are supported globally. In remote cruising locations, parts and technicians are more widely available — an important factor for long-range adventurers.
✔️ Advantage: Shaft Drive
4. Long-Distance Cruising
· IPS:
While efficient and smooth, IPS systems are best suited for coastal cruising and regions with good access to authorised Volvo Penta service centres.
· Shaft Drive:
For extended voyages, especially offshore or across less-developed cruising grounds, the reliability and simplicity of shaft drive systems offer peace of mind.
✔️ Advantage: Shaft Drive
5. Performance & Speed
· IPS:
Thanks to more efficient thrust and lower drag, IPS-powered yachts often deliver higher top speeds and faster acceleration for the same horsepower.
· Shaft Drive:
While typically more conservative in top-end performance, shaft drives offer steady, reliable propulsion in a wide range of sea states.
✔️ Advantage: IPS
6. Space & Comfort Onboard
· IPS:
With compact engines mounted further aft, IPS opens up more interior volume, particularly midship. It also produces less vibration and noise, enhancing onboard comfort.
· Shaft Drive:
Shaft layouts require more room and can transmit more mechanical vibration, though insulation improvements have narrowed this gap.
✔️ Advantage: IPS
Conclusion: A Matter of Priorities
For many owners, the decision between shaft and IPS propulsion comes down to cruising style:
• IPS is ideal for those prioritising ease of use, performance, fuel economy, and modern onboard comfort — particularly in the Mediterranean or for occasional cruising.
• Shaft Drive remains the trusted choice for long-distance voyaging, mechanical simplicity, and ease of serviceability around the world.
As technology evolves, so too do propulsion options. Notably, Azimut Yachts has introduced a prototype hybrid system based on IPS for yachts under 24 metres, offering a glimpse into the future of sustainable yachting. While still in early stages, innovations like this signal an exciting direction for owners who value both performance and environmental responsibility.
Explore Your Options with UNICO Yachting
Whether you're navigating Malta’s crystal waters or planning trans-Med adventures, UNICO Yachting is your trusted partner for yacht ownership and charter. Our team is on hand to advise on propulsion, equipment, registration, and the full lifecycle of yacht care.
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