|
Related Topics:
| Attaching an engine to an outdrive with a torque tube. - I am building a 18" runabout. Instaed of the standard inboard drive, I am a modified I/O setup. I would purchase a used Mercuiser 3.0L I/O. The engine would be installed in the center of the boat as is normal for..
question? putting in a stern drive - i have a 26 ft bulefinn boat that i am redoing and am either a or changing it to a single screw i am wondering if i can mount the motor in the center and run a under the floor to the also to save time and money..
Old Towne Square Stern Canoe - Hello, I am trying to find some plans for a boat similar to an Old Town Square Stern canoe. There are pictures at and The boat is the green one at the dock..
Boat plans using stern drives - I have access to a older 120 HP Merc. stern drive.The runabout that comes with it is in pretty sad shape. Anybody out there know of a source of plans that utilize stern drives? Bowhunter
Lovett Or Rule - I Or Rule?
|
|
|
Next: Boat Building: Need some guidance
|
| Author |
Message |
External
Since: Jan 06, 2005
Posts: 3
|
(Msg. 1) Posted: Fri Jan 21, 2005 10:07 am
Post subject: oval stern tube
Archived from groups: rec>boats>building (more info?)
|
|
|
Hello all.
I have a 34' aluminum sailboat hull that was built some time in the
late 1970's but never finished until now. The stern tube is sch.80
aluminum pipe and was welded by the builder, my question is two fold,
first does any one know of a cutlass bearing to fit pipe approx 1.9".
And second the stern tube seems too be a bit oval, maybe (3/64"-1/32")
probably from welding. Any suggestions?
Thanks Paul |
|
| Back to top |
|
 | |
External
Since: Aug 09, 2003
Posts: 60
|
(Msg. 2) Posted: Fri Jan 21, 2005 11:27 am
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
I'm not sure of how you deal with the dissimilar metals in an aluminum hull,
however all the standard cutlass bearings I have dealt with had a bronze
outer shell. Seems like a problem waiting to happen.
I would think you would want to fit a none metallic insulator between the
two.
For a boat this size, you should be looking for a shaft size of at least
1.125" so that only leaves you 0.3875 clearance for the bearing shell and
rubber material.
I would recommend you look through some standard cutlass bearing specs and
see if there is anything close, if you have the existing tube line bored
in-place, to the closest fit.
Otherwise you might consider welding in a new stern tube that will fit your
shaft and cutlass needs.
My opinion and (limited) experience. FWIW.
Steve
s/v Good Intentions
"Paul Baker" <snowdrift DeleteThis @northwestel.net> wrote in message
news:2b7ea8d0.0501210907.10b4333e@posting.google.com...
> Hello all.
> I have a 34' aluminum sailboat hull that was built some time in the
> late 1970's but never finished until now. The stern tube is sch.80
> aluminum pipe and was welded by the builder, my question is two fold,
> first does any one know of a cutlass bearing to fit pipe approx 1.9".
> And second the stern tube seems too be a bit oval, maybe (3/64"-1/32")
> probably from welding. Any suggestions?
> Thanks Paul<!-- ~MESSAGE_AFTER~ --> |
|
| Back to top |
|
| |
External
Since: Jun 16, 2004
Posts: 31
|
(Msg. 3) Posted: Fri Jan 21, 2005 4:40 pm
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
"Paul Baker" writes:
> I have a 34' aluminum sailboat hull that was built some time in the
> late 1970's but never finished until now. The stern tube is sch.80
> aluminum pipe and was welded by the builder, my question is two fold,
> first does any one know of a cutlass bearing to fit pipe approx 1.9".
> And second the stern tube seems too be a bit oval, maybe (3/64"-1/32")
> probably from welding. Any suggestions?
Make sure you get a cutlass with a non metallic outer shell.
I had to special order mine.
HTH
Lew<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: oval stern tube |
|
| Back to top |
|
| |
External
Since: Jan 18, 2005
Posts: 4
|
(Msg. 4) Posted: Fri Jan 21, 2005 5:23 pm
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
Paul Baker wrote:
> Hello all.
> I have a 34' aluminum sailboat hull that was built some time in the
> late 1970's but never finished until now. The stern tube is sch.80
> aluminum pipe and was welded by the builder, my question is two fold,
> first does any one know of a cutlass bearing to fit pipe approx 1.9".
> And second the stern tube seems too be a bit oval, maybe (3/64"-1/32")
> probably from welding. Any suggestions?
> Thanks Paul
What is your shaft size? - if ~1" then you could fit a cutless bearing
with a 1-3/4" OD. Pack the ovalized gaps between with epoxy thickened
with microfibers. Coat the cutless bearing with a few layers of mylar
packing tape else you will never get it out!
Otherwise, remove the distorted one and re-weld in a round one.
As others have pointed out you should use a bearing with a fiberglass
shell, not bronze. Not as common but they do exist.
Evan Gatehouse<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: oval stern tube |
|
| Back to top |
|
| |
External
Since: Jun 22, 2003
Posts: 234
|
(Msg. 5) Posted: Fri Jan 21, 2005 7:40 pm
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
Paul,
I must admit that I am confused. Stern tube? Cutless bearing? They do not go
together. The cutless bearing goes into a P bracket which supports the
propeller end of the shaft. I have assumed that this is center fin design
and if it is, the propeller is positioned between the fin and the rudder. In
that design, the stern tube supports a packing gland only, not a cutless
bearing. Please keep in mind that water flow lubricates a cutless bearing,
which dictates that the forward end of the bearing is exposed to the sea. If
your hull design dictates a propeller at the rear of the fin, then you must
use a grease lubed conventional bearing on the sea end of the stern tube.
Steve
"Paul Baker" <snowdrift RemoveThis @northwestel.net> wrote in message
news:2b7ea8d0.0501210907.10b4333e@posting.google.com...
> Hello all.
> I have a 34' aluminum sailboat hull that was built some time in the
> late 1970's but never finished until now. The stern tube is sch.80
> aluminum pipe and was welded by the builder, my question is two fold,
> first does any one know of a cutlass bearing to fit pipe approx 1.9".
> And second the stern tube seems too be a bit oval, maybe (3/64"-1/32")
> probably from welding. Any suggestions?
> Thanks Paul<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: oval stern tube |
|
| Back to top |
|
| |
External
Since: Jan 07, 2005
Posts: 136
|
(Msg. 6) Posted: Fri Jan 21, 2005 9:40 pm
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
Steve Lusardi wrote:
> Paul,
> I must admit that I am confused. Stern tube? Cutless bearing? They do not go
> together. The cutless bearing goes into a P bracket which supports the
> propeller end of the shaft. I have assumed that this is center fin design
> and if it is, the propeller is positioned between the fin and the rudder. In
> that design, the stern tube supports a packing gland only, not a cutless
> bearing. Please keep in mind that water flow lubricates a cutless bearing,
> which dictates that the forward end of the bearing is exposed to the sea. If
> your hull design dictates a propeller at the rear of the fin, then you must
> use a grease lubed conventional bearing on the sea end of the stern tube.
Must take exception to the above.
My hull is a fin keel design if you want to call a 21 ft long keel a fin.
The stern tube exits the rear of the keel and contains the cutlass.
The stuffung box has a water injection port.
Cooling water from the raw water pump supplies positive pressure raw
water to the stuffing box to keep the stern tube filled and the cutlass
bearing lubricated.
HTH
Lew<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: oval stern tube |
|
| Back to top |
|
| |
External
Since: Jun 22, 2003
Posts: 234
|
(Msg. 7) Posted: Sat Jan 22, 2005 3:12 am
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
Sorry Lew, you are correct, I forgot about that, but in this case, I don't
think there is room. probably be too restrictive.
Steve
"Lew Hodgett" <lewhodgett DeleteThis @earthlink.net> wrote in message
news:%ciId.2136$r27.1696@newsread1.news.pas.earthlink.net...
> Steve Lusardi wrote:
>> Paul,
>> I must admit that I am confused. Stern tube? Cutless bearing? They do not
>> go together. The cutless bearing goes into a P bracket which supports the
>> propeller end of the shaft. I have assumed that this is center fin design
>> and if it is, the propeller is positioned between the fin and the rudder.
>> In that design, the stern tube supports a packing gland only, not a
>> cutless bearing. Please keep in mind that water flow lubricates a cutless
>> bearing, which dictates that the forward end of the bearing is exposed to
>> the sea. If your hull design dictates a propeller at the rear of the fin,
>> then you must use a grease lubed conventional bearing on the sea end of
>> the stern tube.
>
> Must take exception to the above.
>
> My hull is a fin keel design if you want to call a 21 ft long keel a fin.
>
> The stern tube exits the rear of the keel and contains the cutlass.
>
> The stuffung box has a water injection port.
>
> Cooling water from the raw water pump supplies positive pressure raw water
> to the stuffing box to keep the stern tube filled and the cutlass bearing
> lubricated.
>
> HTH
>
> Lew<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: oval stern tube |
|
| Back to top |
|
| |
External
Since: Jun 22, 2003
Posts: 234
|
(Msg. 8) Posted: Sat Jan 22, 2005 3:12 am
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
Evan,
Welding a stern tube in place will almost always cause cupping and
distortion because of diagonal nature and the length of the weld. When I did
mine, I used a much larger tube for welding, Then suspended a straight tube
within the welded tube and filled the space between the two with casting
plastic, which is used to make engine mounts on large ships. The inner shaft
tube is supported inside the hull by a thrust bearing assembly and outside
by an integral P bracket. In my case, I used a oil pressure fed bronze
bearing & lantern ring assembly followed immediately by a packing gland with
a compression ring. These are positioned directly under the P bracket at the
rear end of the tube.
Steve
"Evan Gatehouse" <ceilydhNO_SPAM_PLEASE RemoveThis @3web.net_NOSPAM> wrote in message
news:41f19cea_2@news.cybersurf.net...
> Paul Baker wrote:
>> Hello all.
>> I have a 34' aluminum sailboat hull that was built some time in the
>> late 1970's but never finished until now. The stern tube is sch.80
>> aluminum pipe and was welded by the builder, my question is two fold,
>> first does any one know of a cutlass bearing to fit pipe approx 1.9".
>> And second the stern tube seems too be a bit oval, maybe (3/64"-1/32")
>> probably from welding. Any suggestions?
>> Thanks Paul
>
> What is your shaft size? - if ~1" then you could fit a cutless bearing
> with a 1-3/4" OD. Pack the ovalized gaps between with epoxy thickened
> with microfibers. Coat the cutless bearing with a few layers of mylar
> packing tape else you will never get it out!
>
> Otherwise, remove the distorted one and re-weld in a round one.
>
> As others have pointed out you should use a bearing with a fiberglass
> shell, not bronze. Not as common but they do exist.
>
> Evan Gatehouse<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: oval stern tube |
|
| Back to top |
|
| |
External
Since: Aug 09, 2003
Posts: 60
|
(Msg. 9) Posted: Sat Jan 22, 2005 8:55 am
Post subject: Re: oval stern tube [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
That's something I hadn't heard of but now that we are discussing this
problem it seem the industry has met the need.
Steve
s/v Good Intentions
"Lew Hodgett" <lewnospamhodgett.RemoveThis@earthlink.net> wrote in message
news:FWcId.1850$YD5.399@newsread3.news.pas.earthlink.net...
> "Paul Baker" writes:
>
>> I have a 34' aluminum sailboat hull that was built some time in the
>> late 1970's but never finished until now. The stern tube is sch.80
>> aluminum pipe and was welded by the builder, my question is two fold,
>> first does any one know of a cutlass bearing to fit pipe approx 1.9".
>> And second the stern tube seems too be a bit oval, maybe (3/64"-1/32")
>> probably from welding. Any suggestions?
>
> Make sure you get a cutlass with a non metallic outer shell.
>
> I had to special order mine.
>
> HTH
>
> Lew
>
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: oval stern tube |
|
| Back to top |
|
| |
|
FAQ
Search
Profile
Private Messages
Log in/Register/Password
