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narrabay
Member
Username: narrabay
Post Number: 19
Registered: 02-2016
| | Posted on Sunday, February 28, 2016 - 12:06 pm: | 
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OK as I contemplate adding a small inboard to my hull, I'm thinking full keel so the boat can be beached. To me it seems that a strut/prop arrangement would be too risky to pull up to a beach. How did they do this on the old days, flush mount cutlass bearing bolted to the back edge of keel and shaft tube and stuffing box in the boat? If so, what is the shaft tube made from, copper? Or is it a flooded channel in the keel with normal shaft log? I have seen stuffing boxes at the back of the keel but then what is the bearing? thanks for any input, info, pros and cons |
bruce
Senior Member
Username: bruce
Post Number: 529
Registered: 07-2002
| | Posted on Sunday, February 28, 2016 - 04:56 pm: |
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An iron shoe/strap was affixed to the keel and used as the lower rudder pivot bearing . The propeller shaft exited the hull above the keel strap and forward of the rudder and the prop was then clear of the bottom. |
ned_l
Advanced Member
Username: ned_l
Post Number: 36
Registered: 08-2012
| | Posted on Thursday, March 03, 2016 - 01:00 pm: |
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"Normal" was all of the above so to speak.
You could have a solid keel with cutlass bearing at the aft end (just forward of the prop) and a stuffing box inside the boat. There may or may not be a shaft tube.
You could have a 'cut away' keel that has a bronze strut which spans from the bottom of the hull to the aft bottom end of the keel (and a cutlass bearing midway between the two).
Or I suppose you could have a solid keel with a shaft tube and the stuffing box on the outside, though this would be a pain to adjust and there is no water to lubricate any sort of a bearing where the shaft tube enters the hull.
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miro
Senior Member
Username: miro
Post Number: 847
Registered: 11-2001
| | Posted on Friday, March 04, 2016 - 05:54 pm: |
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Bruce's desription is pretty good.
If you look at the stern area in the following videos, you'll get and idea of what he was describing.
https://www.youtube.com/watch?v=_F-x1b_3t00
https://www.youtube.com/watch?v=qW5pjW0M4lU
The shoe extends past the stern post, and starts about 18 inches ahead of the stern post.
The cutlass bearing is bolted to the stern post and also serves as a water stop . I will fill the space around the shaft inside the bore through the stern post with thick grease.as additional water leak protection.
Miro
Miro |
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