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tmuir
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SPOKESMAN
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 Posted: Wed Feb 28, 2007 6:05 am Post subject: |
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How top take a simply idea - that works and totally complicate it . . .  |
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tmuir
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| Posted: Wed Feb 28, 2007 6:12 am Post subject: |
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You only use a chicken feed system if you cant fit the size fuel tank you want in the space you have.
MM wants his burner to last more than 8 to 10 mins so needs to be able to carry more fuel.
Only way to do this on a Mamod is above the wick hight so thats when a chicken feed system comes into play.
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SPOKESMAN
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| Posted: Wed Feb 28, 2007 6:14 am Post subject: |
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One simple rule for engineering and design - keep it simple!  |
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Mamodman123
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| Posted: Wed Feb 28, 2007 9:09 am Post subject: |
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Looks complicated but I'll think about it  Need some time to look over this page me thinks
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tmuir
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Titan
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| Posted: Wed Feb 28, 2007 12:08 pm Post subject: |
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I would strongly advise against version A or B of their 'chicken feed' design which is unsafe as there is nothing to stop the sump overflowing if you get the setting wrong. In any case A and B are not true chicken feed types, as they do not automatically keep the level in the sump correct. I will see if I can produce a much better diagram of how a chicken feed system works.
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Mamodman123
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| Posted: Wed Feb 28, 2007 12:11 pm Post subject: |
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| Titan wrote: | | I would strongly advise against version A or B of their 'chicken feed' design which is unsafe as there is nothing to stop the sump overflowing if you get the setting wrong. In any case A and B are not true chicken feed types, as they do not automatically keep the level in the sump correct. I will see if I can produce a much better diagram of how a chicken feed system works. |
That would be useful titan! thanks
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tmuir
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| Posted: Wed Feb 28, 2007 12:21 pm Post subject: |
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Here is a picture of a chicken feed system from 'Model Marine Steam' by Stan Bray.
It has a different wick setup to what we are used to but the principle of the fuel feed is what I'm trying to show.
You open the valve and fuel runs down the delivery pipe into the supply tank or 'sump' as it is sometimes called.
As fuel flows out air is sucked up the air pipe from the sump to replace the fuel that has left the main tank.
When the fuel level in the sump reaches the height of the air pipe it stops air being able to be sucked up it and so creates a vacume in the air pipe which stops more fuel from leaving the resevoir.
This drawing doesnt show it but I'm pretty sure there should be an air hole drilled near the top of the sump tank for the same usual reasons you have a breather hole in any other burner
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Mamodman123
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| Posted: Wed Feb 28, 2007 12:24 pm Post subject: |
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I see, very clever, so there is no chance of putting too much fuel into the burner tank?
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tmuir
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| Posted: Wed Feb 28, 2007 12:28 pm Post subject: |
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| Mamodman123 wrote: | | I see, very clever, so there is no chance of putting too much fuel into the burner tank? |
Thats correct as long as you dont have any leaks or air holes in the air pipe or main tank. But if you did you would know pretty quick as all the meths would run straight out the wicks when you opened the valve.
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Mamodman123
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| Posted: Wed Feb 28, 2007 12:37 pm Post subject: |
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| tmuir wrote: | | Mamodman123 wrote: | | I see, very clever, so there is no chance of putting too much fuel into the burner tank? |
Thats correct as long as you dont have any leaks or air holes in the air pipe or main tank. But if you did you would know pretty quick as all the meths would run straight out the wicks when you opened the valve. |
If that all poured out then it would be a fireball
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tmuir
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Chris
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| Posted: Wed Feb 28, 2007 1:07 pm Post subject: |
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| tmuir wrote: | Here is a picture of a chicken feed system from 'Model Marine Steam' by Stan Bray.
It has a different wick setup to what we are used to but the principle of the fuel feed is what I'm trying to show.
You open the valve and fuel runs down the delivery pipe into the supply tank or 'sump' as it is sometimes called.
As fuel flows out air is sucked up the air pipe from the sump to replace the fuel that has left the main tank.
When the fuel level in the sump reaches the height of the air pipe it stops air being able to be sucked up it and so creates a vacume in the air pipe which stops more fuel from leaving the resevoir.
This drawing doesnt show it but I'm pretty sure there should be an air hole drilled near the top of the sump tank for the same usual reasons you have a breather hole in any other burner |
I'm at work, so haven't given it much thought, but if there was an air hold in the top tank then it would no longer be a sealed system and the meths level in the two tanks could try and level out causing major spillage. I think. As I said not given it enough thought yet. Surely it needs a hole somewhere though.
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yosa
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| Posted: Wed Feb 28, 2007 1:11 pm Post subject: |
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A hole in the top of the lower tank, above the level of the bottom of the tube from the feeder tank will do it.
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