Shaft design

[Danielsan]

Hi there,

As some know already, I am designing my boat let's say from scratch.
Kind of planning daycruiser, Bayliner-Sunseeker kind of thing. 7.42m LOA 2.84Beam, Draft +/-0.4m, displacement 3.000kg.

I would like to reduce costs to a maximum and therefor would like to use an ordinairy true hull shaft with an ordinary rudder control.

I know this is not the most performant solution but I will be much cheaper than any other drive system. "For a firstone"

Can I make a perfectly sealed and operational schaft using the ordinary SKF components

V-ring - 2x O-ring - 2x Lipseal - 2x Deep Ball Bearing at the end trhust
bearing.

Bearings and shaft made of 316 stainless steel, schaft housing made of aluminium or stainles steel.

Somebody any idea? any hints are welcome


Thx in advance,

Daniel Peeters

added info no more ordinary shaft?

http://zf-marine.com/Gears/index.cfm...d=1&CFIDC=NRU2

http://zf-marine.com/SurfaceDrives/T...Fig14a_450.gif

this might be what I would like to make, somehow a bit different of my first idea, but I am not sure about installing a surface drive system as I don't know exactly how my boat will lay down in the water

[Tim B]

I remember that VETUS were supplying prop-shafts and tubes some time ago...

http://www.vetus.com/

in fact, they still are, or some manuals at least. On the site go to 'Manuals' -> 'Propeller Shaft'

The site is in several different languages.

Hope this helps

Tim B.

[Danielsan]

Thx Tim,

I know about them, but I don't like the idea " water lubrified bearings" ?

I was also thinking that what they offer for about 600,00EUR, I could make the same thing for much less if my sealing works properly.

greetings

[Ilan Voyager]

Originally Posted by Danielsan

Thx Tim,

I know about them, but I don't like the idea " water lubrified bearings" ?

I was also thinking that what they offer for about 600,00EUR, I could make the same thing for much less if my sealing works properly.

greetings

I'm an old fashioned one: water lubricated bearings work perfectly on millions of shafts over the world. They are cheap, simple and sturdy.

With lip joints, bearings and so on you'll go into troubles with electrolitic corrosion, desintegration of joints by the sea water and other headaches. The ordinary SKF components are promised to a fast death. So you'll have to shift to special items.Very expensive stuff.
Look at the price of outboard transmissions made in very high series with the same technology as you want to use; expensive and as I see here short lived.

Look at the common transmission of a fishing boat; they last thousands of hours of abuse. Why to make complicated while simpler works well?

[Danielsan]

Guess you might be right.

My point is to get most of the things done by myself and a local steelshop.
In that way there would be no problem to do the maintainance by myself using standard (cheap) SKF components. I see myself as an recreational builder, later on I hope user. But I think my boat won't turn for more than 300 hrs/year.

Are there any sketches that show good, working principles of shaft or surface drive apps?


Greetz,

Daniel