Fox James

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since May 30, 2018
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Recent posts by Fox James

Ok well I guess we are all trying to learn on this forum but I was under the impression that the high temperatures required, were achieved at the end of the tunnel and the bottom of the riser, not at the top of the riser?

Anyway, anything that I can cook in a wok I can cook on my hot plate. 530c is extreamly hot to directly cook on! In fact i avoid the centre hot spot and cook on the 200-300c area.
It is crazy hot, so hot it frazzles virtually anything that touches it, I think that even the best high temp oils combust at 270c.

However a flat bottom wok works fine or I can cook directly on the plate for anything without a sauce. I can also expose my riser and place a round bottom wok on that.
Although I can understand your concerns, I must say that at this stage in my life, after a life time of cooking over open fires, barbecues, pizza ovens, washing machine drums and now rocket stoves, personally I don’t share your worries and I am not is the remotest bit concerned about a few stay fumes!
4 weeks ago
Ok so I am a bit confused now!
So you want to cook over the exposed top of the riser and that temperature at the top of the riser needs to be over 800c?
Or am I missing something?
Like I say on my fire a can get just over 500c on top of the plate but I have no idea what the temps is at the bottom of the riser or mid riser or even under the plate or at the top of the riser?
In any case I won’t be breathing in any fumes... will I ?
Sorry if I am being a bit thick but I still don’t quite get what you are aiming for?
4 weeks ago
Hi Graham, getting 400c while gasifing small amounts of wood is pretty good in my books!

I don’t know what you want to see from your stove?
A top loading compact stove that has a big fire box, good cooking hight and economical wood consumption all appeal to me.
Like I have said Potty’s videos are well documented and there are lots of them but if you want gas analyser results with more technical  evidence, then stick to Peters designs.
There are other videos where his has his stove at max load with full air and the top plate, through under plate baffle and the top steel is over 1000f
In my own stove I can get over 1000f too and that is through 6mm steel, if I try to measure the actual top of the riser,  my gauge just goes off the scale.
I have tried pointing the temp gun down the riser but that goes off the scale too.

If you look at the video at 29.00 you can quite clearly see the secondary air working.
1 month ago
Thomas, now you have your P plate fitted, you could easily play around with gasification just by fitting a lid.
In my case I just have a piece of glass that fits up to the plate.
1 month ago
This 2015 vid talks a bit about secondary air and also shows it working but not until right at the end...
1 month ago
I am a bit confused, what are you going to do exactly?
What it that thing wrapped in cardboard and cling film?
1 month ago
He has lots of videos including one with all the dimensions, the riser is only 29” from the base to the top so it would fit in a barrel just fine.
However he does use quite a high chimney but even then he says it will still work fine with a much shorted one.
Anyway that format suits me and it has been tried and tested for 5-6 years now!
My new fire will be based around that design and as I don’t weld, I won’t be useing much sheet metal, more ceramic board and bricks.
I have been useing my fire in gasification mode for a few months now, I blast it with full air for an hour or until I have done my cooking and the room is warm and then seal it down with just secondly air. I just wish I had a much bigger fire box!
1 month ago
Graham, you just need a bigger fire box with a lid!

1 month ago
Hi Gerry, yes sorry I am not always very good at explaining things?...
No I don’t have a gas analyser or even wish to own one, my testing is based around my hot plate and a watch.

With the fullest and deepest respect to Peter, I feel he has moved on from the J tube design and is now more interested in developing batch burning stoves.
I fully understand how his simple but clever P plate works .... I have one fitted to my own fire!

However I also follow various face book pages and you tubers who follow a slightly different path than Peter walks.

I am primarily interested in top loading rocket stoves for cooking and heating, I see quite a bit of further potential for J tube designs and one aspect is secondary air!
The design I have seen and watched being developed is a removable and replaceable sort of cartridge that fits in the top of the fire tunnel, or just a bent piece of steel for the same effect.
Not that dissimilar to a batchbox top placed secondary air tube, but it is full width of the tunnel and only 6mm deep.

The other development that appeals to me is the big fire box and glass lid approach as this no only offers a long burn time but also a gasification mode.

Pre heating primary air Is also popular on many U.K. builds as are vortex designs, I don’t think any of the builds I follow use a gas analyser so they might not be as efficient as possible but as long as folk can’t see any smoke and the combustion does not leave a lot of ash them I think most folk would call it a success.

Facebook is such a poor platform  for finding back dated post, otherwise I would of copied some pictures... so I will show you a basic sketch of one design, some folk say stoping the plate at mid point works better but both work very well.

1 month ago

Eric Hammond wrote:This was enlightening. I was under the impression this channel was supposed to run down the feed tube, turn 90 degrees, run the length of the burn tunnel and then deposit air at the base of the heat riser.

I think that would work very well though, the air would be very hot and unused until it reached the most useful point.
However that method would be best implemented during the build.

I have a video of my P plate in action, it seems to work but to what effect I can’t really say!
I can see flames exiting the riser with the P plate in action but I don’t actually see much rise in my hot plate temperature.

One thing is does allow, is to turn the fire into a gasifier, that seems to keep the heat up and drop wood consumers by half!
When I build my next one I will be putting much more effort into secondary air and its control.
Haveing a lid on the feed tube and adjustable controls over the air flow seems to offer huge benefits to a J tube rocket.
1 month ago