One major benefit of Volvo Penta IPS is its outstanding efficiency compared to inboard shafts. This can lead to a drastical cut in fuel consumption – a reduction of around 30% at cruising speed.
A 30% reduction in fuel consumption equals an increase in cruising range by over 40%. If a boat with inboard shafts consumes 1000 liters on a specific stretch, Volvo Penta IPS consumes only 700. Those 300 liters you save lets you travel an extra 40% of the original distance.
Quite simply, this means you can skip unnecessary refuelling stops and stay out longer at sea. It is also a huge benefit for the environment since the CO2 emissions are kept low.
But enough theory. Let's look at the hard facts. Here are some actual match-ups.
Volvo Penta IPS vs inboard shafts
All tests were conducted with two identical boats. The only thing that differs is the drive system. It is easy to see the advantages with Volvo Penta IPS when it comes to fuel consumption, top speed and cruising range.
41 foot sport cruiser
Test results
Fuel reduction at 30 knots: 33% (47 l/h)
Range extension at 30 knots: 50% (159 Nm)
Specifications
A: Twin 370 hp inboard, top speed 31 knots
B: Twin IPS500 (370 hp), top speed 37 knots
Available fuel capacity: 1500 liter (US gal. 397)
45 foot performance yacht
Test results
Fuel reduction at 25 knots: 35% (55 l/h)
Range extension at 25 knots: 50% (113 Nm)
Specifications
A: Twin 500 hp inboard, top speed 27.5 knots
B: Twin IPS600 (435 hp), top speed 36 knots
Available fuel capacity: 1500 liter (US gal. 397)
52 foot performance yacht
Test results
Fuel reduction at 35 knots: 27% (62 l/h)
Range extension at 35 knots: 36% (111 Nm)
Specifications
A: Twin 775 hp inboard, top speed 38.8 knots
B: Triple IPS600 (435hp), top speed 40.8 knots
Available fuel capacity: 2000 liter (US gal. 530)