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Old Sep 07, 2008, 11:36 PM
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Keizer Oregon
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Midwest Fantail Launch photos and question

I have had my Midwest Fantail Launch done for few months now but hadn't taken any photos of it so I thought I would share. I also have a quick question, I seem to have the engine running pretty good now, goes for about 20min or so, but I have to keep oiling the valve surface every few minutes to keep it running smoothly, could I add a few drops of oil to the water to help keep things lubricated, I was thinking olive oil as it is nicer to the lake that it would be exhausted into. Here are the photos.




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Old Sep 08, 2008, 01:33 AM
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United States, CA, Santa Clarita
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Nice job on the steam boat, check out this thread

http://www.rcgroups.com/forums/showthread.php?t=475833

If you have any questions please ask.

Steve
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Old Sep 08, 2008, 02:28 AM
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Keizer Oregon
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Excellent thanks, I well look into making a displacement lubricator, how does a 1/2" diameter copper tube with caps on both ends about 1" long or so sound and a tee made out of 1/8" brass tube for the connection to the steam line? Can the steam line go perpendicularly to the oil tank body? Also for the fill on top could one just plug it with a rubber stopper or would it be under too much pressure for that. Or does it work better if gravity is helping it. I have a perfect empty dope bottle for the condenser tank.

Again thanks for your help.
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Old Sep 08, 2008, 10:17 PM
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The steam line can go in perpendicular, up near the top of the tank (you are not supposed to fill the tank with oil higher than the steam line, though it has been done). The steam line can be "dead end" or "flow-through" wrt the oil tank. That is, the tank could be serviced via a T fitting from the steam line, or you could stick the steam line in one side, and have an exit steam line on the other side of the tank. The easiest way to make a flow-through would be to use one continuous tube through the oil tank, with a tiny hole in the tube in the middle of the oil tank; I think the hole should be horizontal, but am not sure. My Accucraft locos have the flow-through design, with the tube filed away, instead of a tiny hole. They eat oil much faster than necessary, so I have to replenish the oil tank more often than convenient. The oil need only be a mist in the cylinder, not a dollop, like the Accucraft provides.

A rubber stopper would not be a good idea. The oil tank is subjected to the same pressures as the boiler, so the stopper would probably blow out. Once it blew, you'd be dead in the water as all the steam would exit thru the top of the oil tank, none reaching the cylinder. Also it'd probably make an oily mess :-). If you are enamored by the rubber stopper idea, then put a keeper on the stopper, like you see on Grosch beer bottles, or like you see on champaign bottles.
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Old Sep 08, 2008, 11:01 PM
Grumpa Tom
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United States, CA, Los Angeles
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Xlnt job on the boat build!!
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Old Sep 09, 2008, 05:46 PM
gamma
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milano_Italy
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Hi Ohm, I like your little boat very much and I'm going to check Midwest site right now, thank you for sharing and keep your pics coming.
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Old Sep 09, 2008, 07:09 PM
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some pics of Lubricators and condensate tanks.

Steve
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Old Sep 09, 2008, 11:57 PM
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Keizer Oregon
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Great thanks for the info, it should not be hard to produce something then. Me and my Dad took the boat out briefly yesterday and tested it and it was a good thing that we had tied a fishing line too it as the wind picked up and it soon became impossible to get it to come back to shore and the steam engine stopped once due to lack of lubrication so I think this oilier well be a major improvement for it. As for the cap I am thinking I could even use a copper end cap and cut an L shaped slot into it to go over the steam line and lock it down, I well have to see what I can come up with.

P.S. Thanks Steve, Kmot and Sergio for the comments, this was my first boat, I have done a lot of RC and CL Planes and I have quite a few hobbies so this was a nice change of direction, that and I have wanted one ever since I saw one at the hobby shop when I was a kid I am really looking hard at the liberty tug and wondering if I can justify it enough to get out my credit card to pay for it, give me time and I am sure I well find a way I would probably go electric on it though.
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Old Sep 10, 2008, 07:57 AM
gamma
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milano_Italy
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take all the time you need Ohm, i'll wait and welcome on board!
ciao
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Old Sep 11, 2008, 10:23 PM
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Keizer Oregon
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Well I think I have the oilier figured out, it is a 1-1/2" long piece of 1/2" copper tubing with a cap soldered to one end and an 1/8" diameter copper tube with a slit filed into it going through it for the steam line. The top cap well be held on with a piece of music wire bent over the steam line. Here is some photos:

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Old Sep 12, 2008, 12:54 AM
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You will need a seal in the cap so there will be no steam leakage.

Steve
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Old Sep 12, 2008, 04:31 PM
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Keizer Oregon
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It seems a pretty good fit, if not I well toss an o-ring it there to seal it up.
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Old Sep 12, 2008, 06:01 PM
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Fill it with water and turn it over. If water leaks out, which it will, so will steam which is under pressure. That's why pipes are soldered and not just pushed together.
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Old Sep 13, 2008, 08:40 PM
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Perhaps you could use a rubber stopper under the brass cap. The stopper would seal against steam leakage, and the cap & wire bale would keep the stopper from blowing out. The cap would have to fit snuggly over the top of the stopper to keep the stopper from lifting, naturally.

I question whether your ship stopped due to lack of cylinder oil. I would suspect low steam pressure is a more likely cause. You did not run out of water did you, that would be another cause of stoppage?. When the cylinder&piston have no oil, they still function, but some of the power is absorbed by friction between the piston and the cylinder walls. The steam, condensed to water droplets on the cool cylinder walls, provides some lubrication, even w/o oil. A well-oiled piston may decrease friction so much that run times double, so it's worth making the displacement lubricator; I think you will be pleased with the result :-).

btw, you have to suck out the water from the bottom of the lubricator after every run (and top up the steam oil). I use hypodermics I got from the farm animal feed store (check the medications section): one to suck out the water, and another one to add the oil. I ground off the sharp ends of the needles by rubbing them on a stone in the yard, cleaning the needles throughly afterwards.
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Old Sep 16, 2008, 01:28 AM
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Keizer Oregon
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That's an idea, with the stopper, I also have some rubber sheet that I could cut into a seal to go into the top of the cap as well, either way I'm sure well work, just need to get time to do it
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