MB22 steam engine

[antopia]

Ian,I am going to have a go at wooden construction first even though I have not done any woodwork since leaving school,if it does not work then I have this option
Regards
Steven

Steven, when you have it ready for putting in a boat River Queen would be ideal and if you do not want to do too much woodwork Kingston Mouldings do a very good quality fiberglass hull 890mm long for her. Cheers, Ian.

[antopia]

another update
how i reamed the eccentric
I did turn in a larger 3 jaw then parted off
this chuck fits into a morse taper on my wm180 lathe.
 
and a photo to show as much as I have got done.

hope to have most done by the end if the week

Steven

[antopia]

well here is an update its taken me a while to do but it has been worth it
works well on air a little tiny dead spot but to small to be worried runs on a small bicycle tyre pump at a few rpm so its a credit to the designer,I just built it.

I can now start on a small boiler
I will put a video up shortly when I figure an air supply small enough

Regards
Steven

[R.G.Y.]

Engine looks really good. Have you a boiler planed. Geoff

[malcolmbeak]

Glad to hear it runs OK Steven. If you are wondering why the top and bottom covers and the steam chest covers extend beyond the block, it is because I fitted some wood lagging to make it look more like the real thing.
The photo shows one of mine fitted with a regulator, water pump and full flow by-pass valve. I think I have drawings for the regulator, but not the other bits.
Malcolm

[antopia]

Malcolm ,I would be grateful for a drawing of your
regulator as i have not seen one for a boat and yours looks very compact,I would not have any problems with a water pump,my boss did say what it resembles but
I cannot remember,he has built a few boats in his time.

Regards
Steven

[antopia]

Geoff,
I have a boiler planned,small vertical 2 1/4"dia 4" long with 2 8mm flue tubes
it will use 2 off 1/2" ceramic burners inside the flue tubes,time will tell,have to buy some pb for the bushes as I have only pb102 which is a very hard bronze.
lucky I get some garage time so should have this finished soon.
I suspect it will cost me about £20.00 as I also have to buy gauge glass some o rings and a gas jet.I use high temp silver solder as its cheap and I have just enough heat,
it will take about 1 1/2 sticks to complete (400mm x1.5) it all came from the junk box,I have enough to make a few more before I have to replace things.
flanges are 1.6mm copper flanged with some home made formers again from the junk box.

Steven

[antopia]

Just to add the burner system,
this is all experimental so its just a prototype and will change when I have it working

I decided to try a different approach to a vertical boiler, ceramics work by radiation rather than convection by the flame so I wanted to create a small water filled area
that is enclosed by the ceramic so it creates a small marine type firebox, experiments show that this is working,there was supposed to be 3 tubes,I calculated room for 3 then flanged the plate now there is not enough room so I am stuck with 2   ,
with a small pull from the blast /blower(did I say I am not conventional) the ceramic should emit a white hot glow so as the engine works the boiler keeps up

as always its interesting

Steven
 

[antopia]

better photo

[derekwarner_decoy]

Morning 2010 & hi PD's.... ..but I think we have a few mixed thoughts here with 70/30 gas & boilers 

1) ceramic material is simply the media in the burner which can support combustion of the gas with oxygen & dispurse the resultant heat energy >>>>> without damage to the actual [ceramic] media...so the ceramic is considered as non consumable

2) the gas flame from the ceramic element essentially is a function of heat convection [heat energy transferred from a lower core temperature] ...to elevate the next element in the path of the heat

3) radiation [of heat] from the RED hot glowing ceramic element does occur...however would offer less than 1% of the thermal output of the model boiler

It is the flame that does the work.....not the glow .....Derek 

[antopia]

Derek,
now you have a point, it does resist the heat it also reflects the heat and use with
exhaust blast it gets a much higher temperature in order of double the heat output
but it does only last for a short length in order of inches
a gauge 1 person from Australia and noted modelengineer proved it John Rogers.
I have also tested it 3/4"x1 1/4"  inch ceramic produces enough heat output to supply
a 7"x2" dia boiler at 60psi with a 3/4"x 1" inch stroke piston fully loaded 40lbs  train

so it must do something, love to know how and what but it works much better than
anything I have tried.

Regards
Steven


 

[derekwarner_decoy]

Hi PD's....& Steven...  without seeming to be critical...I was simply considering a few basic principals

Clearly your trails & tests will be confirmation of the design........

To explain my understanding of a long bluish tipped flame = optimal combustion of gas + oxygen I found the boiler lighter as per the attachment....... .....Derek

[R.G.Y.]

Sorry Steven I had forgotten you had told me about your boiler. Must be my age. Geoff

[antopia]

Derek,
I do understand what you have said I am not an engineer of any sort,I cannot back up my statement with any facts as there seem's little has be published on this type of ceramic,I have not seen the commercial burners used for boats but in the photo's
these seem different ,this type of ceramic is like soft icing,it can be carved with ease and broken without looking!,

I don't explain well, but my best understanding is thus
as the flame gets closer to the ceramic it burns with a much stronger force without
turning the gas up and the ceramic will change from red as in the photo to a white
heat and the heat produced will glow strongly and turn a darkened firebox to a bright red glow how and why this happens to me is unknown but I can make it work
I think that it is possible the flame is being reflected off the ceramic as well as the strength of the flame

I am surprised no one has take this up commercially but I think it has to be internally fired to get this to work.

here are some photos the jet was partially blocked in these photo's and using just
pure butane.
I don't think I have given this out but I have a video on youtube when I was testing
this out
http://www.youtube.com/watch?v=70YC8q5beR0
clearly you can see the change in the burner and there is no external blower used
just light up and wait,normally I use a blower and takes less than 1 min to get enough steam to set off.

>To explain my understanding of a long bluish tipped flame = optimal combustion of >gas + oxygen I found the boiler lighter as per the attachment.......
wish I had an understanding it would make it much easier to explain.

Regards
Steven and have a good new year everyone

[derekwarner_decoy]

Well PD's....... Steven......it certainly works.....very interesting...keep us posted with more .jpgs as you progress the boiler  .....Derek