kees ijpelaar

Did change the burntunnel and set rizer to 100 cm.

now it do fine.

https://youtube.com/shorts/WOpY8rFd55A?si=JZZRsKGAjLaXP-fD

I have a less deep feed, is this not a problem?

I have made smaller the burn tunnel so it is almost the same as the riser.
(2 cm2 bigger).

Hi Thomas.

Thanks.

I see that yours go quite deep, how much I need to left over where the flames go
into the burn tunnel?

Looks like a small gap is left.

I can not see clearly because of dark pictures.

Yes I now Peter has did test what was best, some do bend it into the tunnel
but you do not and is as peter did.

Here I see on your thread that someone did go deep into the tunnel, it is have more
surface to heat air. But the mixing of air is way to far into the tunnel, need to start in begin for
for best result. See the pic.

That is not what peter did.



regards

Do somebody now the sizes of the peter channel for rocket J tubes?

How deep it needs, can I bend 90 degree to get it some distance into the burn tube?

Most I see just point down and make the space smaller where fire go into the burn
tunnel.  I did read it prevent also burn up through the feed tunnel.

Thanks.

I have done some measurements.


Because the rizer is round 150 mm, is 175,82 cm2  and the tunnel is square is 150 mm , is 225cm2  I
have the need to make the tunnel less high, the width stays 150.

Now I have in stead of 150 x 150 tunnel a new one of 150 x 120 mm and is now 180 cm2.

I think this is a best way, I have also make the rizer 100 cm high, that is 20 cm more.

the corners in the burn tunnel is just  wider in cm2 then round, that is why in the books the burntunnel
is less high with round rizers.

Now I go change and test.

regards

Glenn Herbert wrote:I see, a cottage rocket type of unit.

The burn tunnel doesn't need to be built smaller than everything else, just not bigger. Ash will naturally decrease the height a bit during use.

Yes that is the case.

Using for warming when work on car.

Glenn.


I can not make the feed tunnel 30 cm, if I do then I have no room anymore for put wood in.

I can do maybe 25 cm, I can make a closed metal cover, from a old can or so to put over fire in
emergency situations.

It is a barrel with core inside of it.

Compact so to speak.

Hi all


I have read in the book of Ianto and Lesly.

These people state that the burn tunnel needs smaller then the rest
of the ducts.

I can put stones 3 cm thick on bottom, and than have also a ashpit.

then the burn tunnel get 3 cm smaller in hight. Because it needs
to be smaller then rizer for example. I do follow book here.

The size of the cross-sectional areas of
all parts of the stove’s internal ducts should never
decrease below that of C. In other words, the cross sectional areas
of F, G, H, J, and k should all be greater than that of C.
C is the burn tunnel.

I can see some agrees here, because it sucks better and burn better that way.

Hi Glen and Scott.

I have a sound who was oscillating (not blasting ;-() fire because of to much draw when  put extra length on river.

The stink came from smoke, I do smell woodstove stink, I do not want.

For Glen, I have a barrel with a opening on front, when make the feed to long I can not put wood in it,
so did 25 cm long, the river is now 100 cm, that is 4 x feed, can not do more, so feed is now 24 cm..

I have follow the dimensions, the burn tunnel rizer and feed is all 6 inch. Because of barrel dimensions
inside I can not do make burn tunnel longer then max 46 cm edge to edge, with stones 3 cm each
it is 52 cm, that is exact the barrel width.

When I measure from middlepoint like peter do I get feed 16,49 cm burn tunnel  32 cm, and rizer should
be then 66 cm if I am right.

When measure from the edges I get feed 24 cm burn tunnel 47 cm and rizer should then need 100 cm
is this right?

It burn better when make rizer higher, but to high it get to much draft.

I test with upper barrel removed.

thanks.

kees

Have redrawn system a little, I have now use  feed 24 cm,  tunnel 46 cm, and rizer 100 cm.

I have increase the feedtunnel length to 24 cm, is now 20 cm.

That is the advice I see on this forum, I have also use rizer = 4 x feed.

if it works oke, I need not t smell bad things, now I do.

measurements are all from the edges.

regards