Resources/Information for Crank Lubrication?
- DetroiTug
- Full Steam Ahead
- Posts: 1863
- Joined: Fri Nov 27, 2009 5:56 pm
- Boat Name: Iron Chief
- Location: Northwest Detroit
Re: Resources/Information for Crank Lubrication?
Quote: "The article being quoted as pointed out later by Greg is a training publication written 130 years after the event so I actually think that the Navy developed the engines to the point of using Stephenson's link in the way that it was designed to be used, as Naval engineers would have understood the concept, and then perhaps the later a training manual was assembled from a scattering of data some of which was already outdated. "
I'll say one thing, you got a sticktuitiveness a man just has to admire
-Ron
I'll say one thing, you got a sticktuitiveness a man just has to admire
-Ron
- TahoeSteam
- Full Steam Ahead
- Posts: 813
- Joined: Fri Mar 07, 2014 5:38 am
- Boat Name: Wayward Belle
- Location: South Lake Tahoe, CA, USA
- Contact:
Re: Resources/Information for Crank Lubrication?
I'm curious where the optimal suspension point is for the double bar link style seen on most big ships. I know on the liberty ship Jeremiah O'Brien it is located on the pivot point for the ahead eccentric rod. While running there is an obvious disparity between ahead and astern at low speeds which can bee seen while the reversing engine is running round and round. When in astern the engine is quick to react from a stop, whilst in ahead it is more sluggish from a stop, giving several revolutions in astern to one or maybe one and a half in ahead with the reversing engine running at constant speed and the throttle at a constant.
~Wesley Harcourt~
https://www.youtube.com/c/wesleyharcourtsteamandmore
https://www.youtube.com/c/wesleyharcourtsteamandmore
-
- Full Steam Ahead
- Posts: 149
- Joined: Fri May 13, 2016 2:42 am
- Boat Name: Alphington
- Location: Da Nang City Vietnam
Re: Resources/Information for Crank Lubrication?
The difference that you notice there may be caused by the propeller having considerably more slip in reverse than in forward due to the cupping of the propeller blades. This difference is very noticeable on 2 stoke outboard engines when changing from neutral to forward and reverse at idle, the propeller pulls the engine RPM much lower in forward compared to reverse.
- TahoeSteam
- Full Steam Ahead
- Posts: 813
- Joined: Fri Mar 07, 2014 5:38 am
- Boat Name: Wayward Belle
- Location: South Lake Tahoe, CA, USA
- Contact:
Re: Resources/Information for Crank Lubrication?
That's a very good point which I hadn't taken into consideration. Thank you for that
~Wesley Harcourt~
https://www.youtube.com/c/wesleyharcourtsteamandmore
https://www.youtube.com/c/wesleyharcourtsteamandmore
-
- Full Steam Ahead
- Posts: 186
- Joined: Sun Sep 02, 2012 2:39 pm
- Boat Name: No Boat Yet
- Location: Cathlamet, WA
Re: Resources/Information for Crank Lubrication?
This is the reversing link for the ST Portland's port cylinder. Note that the "Stephenson" link has a suspension link that is attached at the center, but fixed so that it can only sway back and forth as the link moves. Reversing is done by shifting the 11' long rod to the valves up and down, and thus the backward looking curve in the Stephenson link. To provide scale, the eccentric connection pins are 16" apart. This system is never linked "in or up" since the variable cutoff is controlled by a separate valve and eccentric that only changes cutoff while not affecting release. I will start a new post in the future once I figure out how to explain the system in a way that is enlightening over bewildering.
- Attachments
-
- IMG_3172B.jpg (108.48 KiB) Viewed 6407 times
- Lopez Mike
- Full Steam Ahead
- Posts: 1903
- Joined: Wed Dec 07, 2011 6:41 am
- Boat Name: S.L. Spiffy
- Location: Lopez Island, Washington State, USA
Re: Resources/Information for Crank Lubrication?
Maybe a picture from further away might help. If possible.
And the labels are almost impossible for a red/green blind person to read. Maybe white or blue or yellow?
And the labels are almost impossible for a red/green blind person to read. Maybe white or blue or yellow?
If you think you are too small to make a difference, try sleeping with a mosquito.
Dalai Lama
Dalai Lama
-
- Full Steam Ahead
- Posts: 186
- Joined: Sun Sep 02, 2012 2:39 pm
- Boat Name: No Boat Yet
- Location: Cathlamet, WA
Re: Resources/Information for Crank Lubrication?
Mike,
This should be easier to see I hope. I'll try to get some wide shots, but from the eccentrics to the engine cylinder is around 25ft so it's hard to get an all in one.
Just for fun I tossed in a shot of the crosshead with drip oilers. There are 19 per side not counting the pressure oilers. This thread did start with a question about lubrication. FYI: the piston rod is 5in in diameter.
This should be easier to see I hope. I'll try to get some wide shots, but from the eccentrics to the engine cylinder is around 25ft so it's hard to get an all in one.
Just for fun I tossed in a shot of the crosshead with drip oilers. There are 19 per side not counting the pressure oilers. This thread did start with a question about lubrication. FYI: the piston rod is 5in in diameter.
- Attachments
-
- IMG_3169B.JPG (101.59 KiB) Viewed 6397 times
-
- IMG_3174B.JPG (91.63 KiB) Viewed 6397 times
- cyberbadger
- Full Steam Ahead
- Posts: 1123
- Joined: Thu Nov 07, 2013 9:16 pm
- Boat Name: SL Nyitra
- Location: Northeast Ohio, USA
Re: Resources/Information for Crank Lubrication?
The Chautauqua Belle's Engines have something similar to that "sideways" suspended Stephenson linkage.
http://www.youtube.com/watch?v=YL4FhOKG_lE
-CB
http://www.youtube.com/watch?v=YL4FhOKG_lE
-CB
- Lopez Mike
- Full Steam Ahead
- Posts: 1903
- Joined: Wed Dec 07, 2011 6:41 am
- Boat Name: S.L. Spiffy
- Location: Lopez Island, Washington State, USA
Re: Resources/Information for Crank Lubrication?
Interesting. Is this really Stevenson gear or something close to it?
Somewhere around here I have a book entitled, "101 valve gears." I read through it forty years ago and my headache lasted a week. Haven't cracked it since!
Somewhere around here I have a book entitled, "101 valve gears." I read through it forty years ago and my headache lasted a week. Haven't cracked it since!
If you think you are too small to make a difference, try sleeping with a mosquito.
Dalai Lama
Dalai Lama