Volvo Penta IPS: The future of Inboard Marine Performance
Article Page 4: Volvo Penta IPS Propeller Advantages

Volvo Penta IPS Propeller Advantages

Volvo Penta IPS
Twin Counter Rotating Propeller Technology

Twin Counter Rotating Propeller Technology is an integral part of Volvo Penta IPS that offers dramatically improved performance on 35-50 foot yachts that are typically propelled with inboard shafts, struts and rudders. The Volvo Penta IPS propulsion unit integrates the vessels steering, water intake and exhausts as well as propellers.

Volvo Penta IPS incorporates aviation propeller theory by locating the propellers at the front of the propulsion unit so that they operate in an undisturbed medium with minimal reflected pressure pulses because there is a greater distance from propeller to the hull bottom.

Conversely, conventional shaft systems are less efficient than Volvo Penta IPS because the propeller thrust of an inboard shaft is angled downward causing the propellers themselves to battle against the turbulence generated by the strut and shaft moving ahead of the propeller.

Volvo Penta IPS patented propellers feature increased blade area which reduces the load on each individual propeller by better distributing the forces. Using two smaller-diameter counter-rotating propellers further minimizes propeller tip losses and cavitation. By design, rotational losses are prevented and no lateral forces are created. All of the propeller thrust generated is in concert with the horizontal momentum of the vessel.

The Steerable Propulsion Unit, responsible for the outstanding maneuverability, handling and driving pleasure, is what truly distinguishes Volvo Penta IPS. The Volvo Penta IPS propulsion unit turns and points the entire thrust of the propeller in the desired direction. The result is a much higher propulsion efficiency and, due to the aerodynamically designed propulsion unit surface area, greater helm responsiveness. With raw water intakes integral to the propulsion unit, the need for seacocks are eliminated. With the intakes deeper in the water below the hull, fouling from surface debris is impossible. Helm response is precise as the propulsion units serve as highly efficient rudders yielding the truly unique benefit of positive and accurate steering in reverse.

Employing two counter-rotating propellers on each propulsion unit means that there are no lateral forces affecting steering and, therefore, course tracking is straight on. Propulsion forces and transmitted vibrations are absorbed by the combined rubber suspension and sealing, while a U-joint in the drive shaft makes it possible to have the engine soft suspended further reducing transmitted engine vibration.

Electronic throttle and shifting give a distinct and precise feeling at the helm, and shifting is immediate. Thanks to the progressive, electronic steering by wire, the helm of even a large yacht spins easily at low speeds. The shorter steering ratio which produces greater helm resistance at higher speeds, enhances vessel control.

"Loved it—it’s a fun boat. Big Boat with a small boat feel."