IPS Drives - Vote

[petem]

We've heard all the arguments for and against these drives.

I'm quite happy to put my head on the line and declare that I would not buy a boat equipped with these drives.

Would you?

P.S. Please remember that IPS drives are an alternative to shafts, not outdrives.

 

[lanason]

I don't know what an IPS is /forums/images/graemlins/confused.gif .... guess a bit of homework needed /forums/images/graemlins/crazy.gif

 

[petem]

Try to keep up Adrian /forums/images/graemlins/wink.gif

 

[lanason]

So in 15 words or less /forums/images/graemlins/shocked.gif

- What is an IPS (or don't you know either) /forums/images/graemlins/wink.gif

 

[petem]

One of these.....

 

[mainshiptom]

My boat (shafts) sits on the mud hapily ?

would ips do that ?

Tom

 

[hlb]

More simply, it's like an outdrive, but the props in front and it sticks out the bottom of the boat ready to get knocked off!! /forums/images/graemlins/frown.gif

 

[oldgit]

The more that you look at this concept the more shortcomings appear.The need for this drive to be developed itself indicates the direction that the market is going and where Volvo and the premium british boatbuilders think their money will be made in the foreseeable future.Increasingly fast and prestige boats which can ONLY be hopped from one marina to another somewhere.Suspect that half of the UK coast has been ruled out as possible bolt hole or refuge cos this thing cannot take the ground.As to the claimed efficiancy,the power has to go through just as many bearings and UJs as your average out drives.So all that speed comes from moving the point of drive a foot or two further forward.Yea right.

 

[hlb]

I'm quite lost with the whole modern boat concept. The length and beam quoted seem in disproportionate order to real size. So Old haggared M Farter at 35ft is now nearly as big as a P50 with about the same facilities. How big a new boat do you need these days for two folk to lie down in comfort and watch the TV?? Can you still get off a new'ish boat if you have a dinghy on the back?? Or do you not need one cos there is a marina just about every where?? Or are they going to ban visits to the beach anyway??

 

[jfm]

There is some Luddite mentality here imho

[ QUOTE ]
boats which can ONLY be hopped from one marina to another somewhere.Suspect that half of the UK coast has been ruled out as possible bolt hole or refuge cos this thing cannot take the ground.

[/ QUOTE ]

That description applies to shaft drive boats. IPS is a replacement for shaftdrive. So what's the problem?

[ QUOTE ]
As to the claimed efficiancy,the power has to go through just as many bearings and UJs as your average out drives.So all that speed comes from moving the point of drive a foot or two further forward.Yea right

[/ QUOTE ]

There is no UJ in an IPS. No need for one, as the drive only rotates in one plane. The two 90deg bevel gear sets will eat some power. But the reduced drag, duo prop design, and forward facing props compensate for that many times over. That's where the efficiency comes from. The "point of drive" isn't moved forward relative to a shaftdrive.

You seem to be comparing this to outdrives. That's not it's intended market. It's a replacement for shafts.

I'm amazed at all the negative sentiment. Someone invents a gadget that replaces the shaft drive and offers markedly more fuel efficiency, gets rid of need for rudders and steering hydraulics, frees up accommodation space, includes an underwater exhaust, and loads of people complain that it will bust if they hit the bottom (just as a shaft drive boat will....) What exactly do you folks want the world's engineers to invent for you?

 

[petem]

Re: There is some Luddite mentality here imho

You're not related to Sir Clive Sinclair are you JFM /forums/images/graemlins/wink.gif?

I guess only time will tell.

 

[fireball]

Re: There is some Luddite mentality here imho

[ QUOTE ]
What exactly do you folks want the world's engineers to invent for you?

[/ QUOTE ]

Just fit an airbag (or should that be a waterbag?!)
Or if intentionally taking to the ground then a protective casing should be deployed around the kit.

 

[Wiggo]

Re: Elastic Rulers

Haydn, I worry about what you may have been telling Debs, mate. I suspect you have some kind of elastic ruler.

The P35 is 35'0" LOA x 12'1" according to the dimensions given in 12 ads (35'3" in according to three others, which gives an average of 35'0.6"), with two cabins and a single head.

The P50 appears to be 50'3" LOA x 14'8" and is a tricab layout with twin heads.

I make it about 75% more floor space in the P50. Now, I grant you, if you had friends and family no taller than say 3'6" (perhaps you are a hobbit, for instance), then the P35 would indeed feel as spacious as a P50 to real people.

Point taken about banning beaches. I wish they would give more thought to stowing/launching/recovering tenders...

 

[hlb]

Re: Elastic Rulers

Ok the P50 comparison might be an eggsasperation!! But they all have a great big swim platform now included in the length and then loose another three foot with angled arse ends. Dont know what this has to do with Volsplutter new drive though /forums/images/graemlins/confused.gif

 

[jfm]

Airbags/recovery lanyards

I wish these could be offered as cost options whose development cost is fully covered in the option price. Then it could be seen how much the market really wants them.

This is a judgement call, but I think Volvo have called it right in just letting the busted-off units sink to the bottom of the sea, insead of faffing about with airbags/string to retrieve what will largely be a pile of scrap metal.

 

[Wiggo]

Re: Airbags/recovery lanyards

It's a good point - it doesn't take a lot of damage to the lower leg of an outdrive to turn it into junk with no salvageable components. If you twat an IPS unit hard enough to break it off, do you expect anything to be salvageable? Props destroyed beyond repair, lower gear casing distorted, lower bevel gears mangled and shafts out of alignment. It's value would be as xKg of scrap bronze, surely?

 

[Its_Only_Money]

Re: Airbags/recovery lanyards

[ QUOTE ]
It's value would be as xKg of scrap bronze, surely?

[/ QUOTE ]

Likewise the other half of the sheared joint that is still in the boat.....so I assume to "repair" it you'd have to fit a whole new IPS just without the enginy bit???

 

[wakeup]

Re: Airbags/recovery lanyards

Err no, the whole point is that is does shear off to protect the upper parts and engine doh!!!!

 

[wakeup]

Re: Airbags/recovery lanyards

I think the real point that I guess has been missed is that I asume that you can't fit rope cutters to these props and therefore more likely to get snagged.....

 

[Mike21]

Re: Airbags/recovery lanyards

Was under the impression with duoprops there's no need for ropecutters