M67 immersion heater documents online

[Tony]

Did a bit of searching around and found these:

DEVELOPMENT OF THE HEATER, IMMERSION, M-67, LIQUID-FUEL-FIRED, FOR CORRUGATED CANS
http://www.dtic.mil/dtic/tr/fulltext/u2/665390.pdf

M67 technical manual
http://www.liberatedmanuals.com/TM-9-4540-202-12-and-P.pdf

The first details the development and gives an idea of thermal output and fuel flow, as well as interesting statements such as: "In an emergency, the heater can be used for direct space heating of shelters or tents, and direct heating of liquid foods, such as coffee or soups."

The latter is an operators manual which states: "Operation with the alternate or emergency fuels will usually result In Increased lighting difficulties, decreased efficiency, more frequent adjustments to the fuel flow rate, Increased smoke output and shorter Intervals between scheduled cleaning."

After our failed glyc burn in one at BBB 2013 (and successful biodiesel burn!) Stephen apparently cleaned the burner torus by running it unsubmerged until very hot.

[julianf]

It may be worth wondering if the term "emergency situation" possibly has a different meaning to the military than it would to the rest of us?

I can see how there's emergency situations where the fire has gone out, its dark, its raining, the tent is getting cold, youve had all the firewood within easy distance, and you only have your flip-flops...

...but then the military may have a different idea - one where it may be borderline which would die first - the M67  or the people its keeping warm!


Im just wondering what sort of decrease in life expectancy (of the M67!) would be acceptable to casual users?

[Mickindashed]

I really like the idea of dewatering an oil drum full of wvo with one of those beauties!

[photoman290]

It may be worth wondering if the term "emergency situation" possibly has a different meaning to the military than it would to the rest of us?

I can see how there's emergency situations where the fire has gone out, its dark, its raining, the tent is getting cold, youve had all the firewood within easy distance, and you only have your flip-flops...

...but then the military may have a different idea - one where it may be borderline which would die first - the M67  or the people its keeping warm!


Im just wondering what sort of decrease in life expectancy (of the M67!) would be acceptable to casual users?

the decrease in life expectancy ,of the user running it on petrol i suspect is rather a lot.as regards the heater i have 2 of the bases so will report when it stops working.

[Tony]

Mine runs OK on red diesel but a lot of soot builds up.  On bio it is much cleaner (even with my bucket of nasty bio that got left out in the rain).  In both cases it smokes and doesn't run perfectly clean, but it's better on bio.  Just adding bio to a diesel mix seems to help with the emissions.

If fuelled excessively it "chuffs" - I guess hence the name puffing billy, which is great for blasting the soot out and generating an awful lot of heat

What gets really exciting is accidentally getting water into the starting cup or the heater toroidal section, as soon as it's up to temp the water flash boils and then a lot of heat happens very quickly - whooomf!

[rbdazza]

Im loving mine. Best 30ĢI've spent in a long time

[Tony]

Have you tried it on petrol/diesel mixed with veg yet? I'd like to give this a go because I don't have an unlimited supply of red/bio.  I guess it would run on any misfuel going.

[rbdazza]

Not yet, I've got over 100l of questionable bio to use up first

Last couple of batches I've managed to dry the veg and run both stages without using the electric immersion heater, all on about 2l of bio used for fuel each batch.

[Tony]

Definitely onto a winner there!

If there was only a way to use it to heat 500l at once and get all the drying over with in one go.  Hmmmm.

[rbdazza]

I've been thinking that myself. The only benefit of heating and drying as you go is carrying the heat into the processor and saving on electric.

Although adding a 500l processor to the equation sounds like heaven !

[photoman290]

thinking of using my m67 to heat the yurt, not directly, the cover is pvc and the insulation is recycled plastic bottles,plus the frame is wood. not a good combination with  an open flame me thinks. the idea is to heat 200 ltrs of water outside then pumping it into another 200 ltr drum inside  the yurt using one of those 12volt diesel pumps. this is until i finish the rocket mass heater. that should be fine in the yurt as the flue runs outside and is only at 40c or so. not sure how long 200 lts of water at 70c will take to cool down but should be ok i hope.

[Tony]

You wouldn't need a large mass of water in the yurt, just a radiator - otherwise you're wasting valuable yurt space. I imagine hep2o would be the way to go for the piping. Sounds like a fun project!

Having been given 200l of red diesel I've got even more coming my way - it's all free heat in the M67.  Any misfuel would work a treat

[rbdazza]

I wanted to use mine to dry oil in my garage and double up as a heater for when the cold night brewing starts. Problem is I'm not convinced its safe enough to keep inside and as I rent, drilling a massive hole for the flew might not go down to well

[photoman290]

You wouldn't need a large mass of water in the yurt, just a radiator - otherwise you're wasting valuable yurt space. I imagine hep2o would be the way to go for the piping. Sounds like a fun project!

Having been given 200l of red diesel I've got even more coming my way - it's all free heat in the M67.  Any misfuel would work a treat

the problem with doing that is i would need to run a pump continuously. i am on solar with  genny backup  so  running anything continuously is not always possible. running a 12volt pump for 7 minutes is much more feasable. once the drum in the yurt is full i tranfer the pump to the yurt drum ready to transfer the cold water back again. the drum with the m67 in will be insulated with 100 mm of celotex. which is insulating the coach at the moment. thermal mass  is the idea,as in
 the rocket mass heater.

[Tony]

You might be able to start thermal circulation with a rad, no pump required