DIY TLUD stove, looking for expert review.

[osian baker]

Hello, can someone give some feedback on my TLUD stove. The upper ring of holes on outer shell is 4mm with 44mm items. The lower holes are 6mm and with 10 items. The holes on the grate are 6mm arranged in 3 rings (20mm, 40mm, 55mm from center) with 6 on the 20mm ring, 10 on the 40mm ring, 13 on the 55mm ring. the specs of the stove are 95mm radius and 200mm height. Uploading an image now if I can figure it out. Thankyou.
Image - https://www.image2url.com/r2/default/images/1776355374456-2077416c-fda7-4459-a0a4-e9eb76272526.png

 

[C_Claycomb]

Hello,
Would be better to have the picture so it displays with BBCode in the thread rather than downloading when link clicked. I have pasted it here for ease.

Your manner of describing the design is a bit hard to follow, mixing radius, item when you mean holes and some diameters. For something like this, stick to diameters, no radiuses. You can measure diameter with callipers or even a rule, but finding centre to measure radius is very inaccurate outside of CAD.

For the grate holes, stick to stuff that lines up, or fits between. Easier to lay out. 6, 10 and 13 is a really weird combination.

How about 6, 12 and 12 on PCD 20mm, 37mm and 55mm. For comparison, your layout is on the left and my suggestion is on the right. Mine has one more hole, as is, but I would recommend one more dead centre.



The ring of holes at the bottom on the outer case look a little few and small for the size of can. Remember that you will get ash and charcoal falling through the grate and will then need a way to get it out from the bottom area. Bigger holes make it easier to shake out.

The ring of holes at the top appears to be in the wrong can. Air must be drawn in from the bottom, some pre-heated and then injected into the top of the stove. Yours is expelling that heated air away from the fuel chamber.

The stoves I made had the chamber bottom air holes in the sides and a grate of ni-chrome or stainless wire above them, as per the old Bushbuddy stove. That has worked okay, but maybe overkill.


Best of luck! These things can be fun to make. Drilling stainless biscuit tins isn't the easiest thing, Step drills can work, as can the Bosch Universal carbide drills.

Chris

 

[stonepark]

The airholes in the bottom outside can need to be able to feed both the inside can grate holes and the upper holes in the inside can to provide air for the secondary combustion. The outside lower holes should be almost be touching and some people put in a second row as the combined area of outside can holes should be greater than area of the combined inner can holes.

Below is an upside down (outside can) which effectively has no bottom example with also holes in lower inner can side wall which generally are not required.

 

[crosslandkelly]

I love making these tin can stoves. This is one I made the other week.

 

[osian baker]

Wow ! thank you so much for the support, it's really great too see the internet is still a useful tool too connect with other designers. I'll make the suggested changes and report back too this forum

Thanks, Osian