Volvo IPS Drive Crash Video

I still don't like them.

That film shows what could be argued as the best case scenario. It runs into a vertical immovable object and the shock load shears the leg off.

How about running it up on a real life pile of rocks or a shoal where it gets slammed around a bit at something other than 90 degrees to the cliff.

This has been up before: http://www.yachtforums.com/forums/117620-post176.html

And discussed a lot as you can see in my search: http://www.yachtforums.com/forums/search.php?searchid=645489

That second link doesn't seem to be active anymore.
Granted different circumstances may have different results, but running up onto a pile of rocks seldom has good results. With conventional drives and rudders you're quite likely to hole the boat or even rip the running gear out of the boat, and that hole won't be sealed. Personally, I love IPS. Between the fuel savings and the maneuverability their great. Certain bugs are sure to surface as time goes on though same as with any new technology. One thing that I wonder about however is, where are the crash, economy and maneuverability stats, etc. for Zeus? Have they reached the fuel savings of IPS? What happens when they hit something?

....Me neither. Fancy parts to break. Very expensive. Those things transfer power 3 directions, with duoprops at the shaft none the less. A shaft in a shaft. Too many moving parts.

Good idea from an autocad drawing, but not practical...Ships and tugs that use Z drives aren't cruising around at high speed in shallow water, such as a recreational vessel fitted with pods.

OK, but what is better with grounding a shaft and rudder boat that sinks..?

Anybody here ever have to replace shafts, props, struts and rudders and repaired the bottom damage after running into a rock? Fortunately, I haven't, but I suspect to will cost near the same as replacing the lower unit for an IPS. Then you have what's saved on fuel and the other perks. Better to just stay off the rocks with either.

Hi,

Anybody here ever been asked by an Owner of a 70m yacht why his boat doesn't seem as smooth as when it was new a year before and then found when it was hauled that both props were beat up like rose buds and the only Captain who had ever driven it knew nothing about it?

.......Ignorance does get expensive! And can cost you a job among other things.

To be fair, one trip through NY Harbor will leave you a bit dinged and you'll never be near the bottom or rocks. I've been through there when you could almost walk from the Verizano to the Bklyn Bridge on the debris. We're talking everything from garbage cans to dock and pilings. Some dings go with using a boat. (A captain should notice when they're rose buds though).

Yea, Looks nice from idealistic standpoint, but any chance that will actually save a boat? I wonder if there are any reports of unsunk boats from the Penta Design.

I've seen outdrives ripped off as well as shafts and rudders, always leaving a big hole. Anything can be ripped off if you try hard enough. I do know of one IPS that nailed a sandbar. It sheared off and sealed as planned. Still curious if anyone knows about how Zeus handles this?

I'd like to see a video where researchers throw chunks of drift wood onto high revving IPS props.

That's a day in NY Harbor, and I've come through with a few. NBD. Pretty much the same with whatever. If you hit hard enough to stop an IPS (or Zeus I'd imagine) you'd be stopping with a shaft drive as well. With anything you've got a few inches of protection whether it be the shaft, the unit or the cone. Beyond that it's just blades.
Capt.J, most info I've seen on the Zeus. Thanks. Can you lead me to a good site for Zeus info?

It is always interesting with news and opinions on a product, so please post it here. But before we start repeating ourselves, here are already 289 posts on IPS vs Zeus drives:

http://www.yachtforums.com/forums/technical-discussion/5855-volvo-ips-cmd-zeus.html

http://www.yachtforums.com/forums/technical-discussion/13016-need-opinion-ips-zeus.html

http://www.yachtforums.com/forums/g...appens-ips-propelled-boat-when-hits-rock.html

http://www.yachtforums.com/forums/technical-discussion/10673-hit-anything-lately.html

We were thinking of having twin IPS900 instead of triple IPS600 in our 54', but they were more heavy, giving less speed and mileage at a higher cost.

For our coming 80' I am planning to have triple IPS1200 (the biggest available today) but perhaps we should just have two and reduce the top speed.

There are three sizes of IPS drives as you can see here:

http://www.volvopenta.com/VOLVOPENT...ENTA_IPS/ENGINE_RANGE/Pages/engine_range.aspx