Robinson Revisited.......

[Bluechip]

Lack of comment ??? Could be we're speechless with admiration ...

I was going to ask you to elaborate on the Bix Burner bit 'cos I've made a burner, or some bits  of one, but I've not much idea where to put the jet or what size & where from etc.

Mine is  a tubular doins with slits, like a Bunsen Burner on it's side, but with no hole at the far end, just slits on one side ...

( In fact, nowt like a Bunsen Burner really ) ??? 

I have some gauze to poke in it, to make a diffuse set of flames. Was going to use it on that Stirling Engine that I melted with my big propane burner.

Dave BC

[Stilldrillin]

Dave.
Nah! Any speechlessness around me is exasperation. Usually!

How do you want me to elaborate?
To get the jet position, you need to measure one, or look at a similar drawing, an I did both..... 

I was more concerned about what was needed inside the box. But I guess I guessed right! 

David D

[fcheslop]

Just quietly watching David, she a good un
The end of the jet usually sits inline with the edge of the air hole and you can add a few baffles in the base to mix the gas n air.
The poker burners Iv built seem to work better if the slits are no wider than the tubes gauge
cheers

[Stilldrillin]

Thanks Frazer! 

I found it burned best, with the end of the jet holder 1/2 way across the air holes.

It was your comment, at Harrogate, about plugging the end of the tube.
That gave me the idea to bounce the gas/ air mix off the floor...... 

David D

[Bluechip]

Ah! But what are we poor paupers to do who lack a burner or drawing to look at ??

I have a jet ripped from a defunct Taymar thingy, but I have no idea what the damn thread is on it ??

Nor do I know how much gas it will pass. Judging by the output on the torch, a lot more that I want, so I guess it could be restricted on the input ??

It does have a number on it  ( 5 ?? ) does yours have a number ?? The one I have is for propane or propane butane mix, which is what I use.

Do you know what the thread is ?? It's a damn titchy thing to measure, it appears to be 1BA, but I don't know for certain.

Dave BC

[fcheslop]

Usualy 1BA a number 5 has a 0.2mm dia hole
cheers

[Stilldrillin]

Dave.
Don't know how Taymar rate their jets for their thingies. 

Several of the Steamtoy lads have adapted small blowlamp heads....... http://modelsteam.myfreeforum.org/ftopic31388-0-asc-0.php

The jet I've used is a No5. The smaller one  is a 3, not much difference, I'm told.

Let me have a bit of breakfast, an I'll ring you. 

David D

[modeng2000]

David, the design of gas burners might be better as a new posting instead of part of your Robinson.

It seems to be something of a black art and a lot of cut and try before getting an acceptable burner. I have used the ceramic with holes to make a burner for a G1 DeWinton loco but although the result worked I'm not sure it was optimum.

Is it worth trying to make jets or are they just too difficult? I discussed this with a someone at an exhibition but he wouldn't say much about how he made the jet hole!

John

[Stilldrillin]

Hi John.
Yes. You're right. A separate posting might have generated more discussion. 

I wouldn't try to drill such small holes!  ........ Not when jets are available, so easily.....    http://www.forest-classics.co.uk/gas_jets.htm

David D

[steamer]

Tested the MK 1 burner, this afternoon. Still got me eyebrows! 

It all went very well, considering.   

Sensible maximum. (Don't like the high centre cone).......




Sensible minimum.......




Turned right up......




With those blue tips being blown upward, I think we need some more holes!


Mid sensible, setting. It ran the engine perfectly!   




A bit of cosmetic work to do on the pot, and drill some more holes..... Job's a good un! 

David D

Great job on that burner Dave....Like  others, I've tried the slotted poker burners before on propane...they work..but not as  well as that one does!
 

Dave

[Ian S C]

Some of the burners for my hot air engines started life as camping stoves, worth looking at if only to get ideas. Yes I think a few more holes may help.    Ian S C

[NickG]

David, I have no idea how burners work.  How did you do it then, machine the body bits yourself and bought a jet? Certainly looks to work perfectly.

[Stilldrillin]

Dave, Ian...... Thank You! 

Nick.
I installed a Bix tank and custom made, small burner on the Huxtable, some time back. It works very well.
That was all I knew about gas power..... 

After trying meths, I got a runner, (just), on a piece of esbit......

<a href="https://www.youtube.com/watch?v=7-b7CB1XpLo" target="_blank">http://www.youtube.com/watch?v=7-b7CB1XpLo</a>


The only answer had to be, gas.

Here's the Bix/ Huxtable set up.......




I already had the spare No5 jet, in a 5/16" holder. But made the rest following the Bix design, also the burner drawing for the Scott engine. As serialised by John Boggy.

This gave me the jet chamber/ venturi dimensions. But, I had no idea of what was needed inside the pot.

Once I got me head around the need to thoroughly mix the mixture, before the flame. I decided to dump the charge downwards, to the floor of the chamber.

The three exit holes are installed the other way up. No hole in the end of the pipe......




It worked! Very well!!   

David D

[Stuart]

Dave

Polly do them as well .

tanks , filler fitting and the ceramic to cut your self


no association with them but another source to peruse


Stuart

[zeeprogrammer]

Nice thread David and congratulations on the build.

I would also support a thread on building gas burners. It's something in my future and I too would like to keep what little eyebrows I still have.