| Volvo ISP 850
Now that Volvo has come out with the ISP 850 engine and propeller system I am wondering if it would make sense in a boat that I am considering. The ISP 850 is apparently rated for boats up to 75 foot in length.
The 76 footer I am considering building specs out with standard Cat C-15 Acert engines that produce 800 bhp each.
The new ISP 850 engine is rated 670 hp but other than that I have very little else in bhp to compare. Given this engine is “touted to be 30% more efficient” than say the Cat, then the 670 should equate to 871 at the high end. 20% efficiency would be 804 hp.
Moreover, with the ISP system, a joy stick provides close in maneuvering, thereby the need for bow and stern thrusters is eliminated.
With the elimination of thrusters there are fewer components in and under water, fewer components in the engine room and ultimately less that can go wrong, not to mention less to maintain and fewer spare parts required.
If the engines are smaller the engine room would be roomier overall.
Less engine weight, less the weight of the thrusters eliminated and all of their operational and spare components as well, should mean a good deal less overall machinery weight contribution; less under the water in the way of parasitic thruster components; should reduce fuel consumption somewhat.
So…..what’s the down size..!?
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