ESAZA, spanish clon 8R Butane stove

Hi, @pau-i-amor , Pau,

What a neat little stove!! I've never heard of such a stove, and most certainly have never seen one, until you shared yours with us!! Huge thanks for doing so, my friend!! Amazing that such stoves exist, and seem to work very well!! Thank you for your report, and the excellent photos!! Take care, and God Bless!

Every Good Wish,
Doc

 

What a fantastic little stove! I normally don't get too excited over butane/propane stoves, but this one is quite unique and looks well constructed, stable and practical, just like an 8R! I certainly wouldn't mind having one.
One note of concern, however.. It looks like there is nothing stopping someone from inadvertently removing the tank fill cap while the tank contains pressurized (perhaps liquid) butane, with possible disastrous results. Not that you should really need to remove the cap, but it might have been better to eliminate the screw cap altogether.
Regards,
Doug E.

 

@gieorgijewski

Found the patent. The drawings show a stove that looks more like an Optimus 8.

Nicola

 

good...
ES275767A1 • 1962-05-16 •
ISPIZUA MOTA JOSE LUIS
Earliest priority: 1962-03-24 • Earliest publication: 1962-05-16

"A GAS KITCHEN FOR" CAMPING ", basically characterized by being composed of a cylindrical tank consisting of a through pipe of a certain diameter and 60º of inclination on the horizontal axis, which makes the liquid surface contained in the fuel The tank and the upper part of it is a watertight compartment, while a safety valve is housed in the outer end of said tube, while a tube with a smaller section than the first one comes out through the lower part of the tank. said tube runs a wick through which the liquid fuel goes to a nozzle in which the ignition point is located, which goes in the lower part of a tulip, which carries in its upper part a shock plate-grid, whose object is that, when the flame hits against it, it runs through the four lateral holes, thus causing a sudden rise in temperature.

 

patent vs real design changes

 

Are you going to leave this stove alone?
I wonder what the internal pressure in the tank would have to be to make the stove effective on butane.
I wonder if there is still a wick inside the burner pipe? Isuspect the old patent is a
Do gas burners have some sort of sintered bronze filter affair to intercept liquid gas and restrict the passage to just gaseous butane?
On the face of it it looks to have the obvious risk in that there is no indication when the stove is charged, not even an 'pip' as on a Tilley lantern.
Then the valve is easily removed........

 

Definitely a new one on me. What a neat stove!

....Arch

 

@gieorgijewski I will inspect the inside of the tank on my a Esaza to see if there is any wick, but I have doubts.

I was interested especially in the drawings of the filler cap, but as well on the filler cap drawing we basically have an Optimus 8, I see a normal SRV, not the Esaza filler.

Very strange.

Nicola

 

Maybe not so strange Nicola, in that the 1962 patent describes a by-then obsolete design of a self-pressurising stove not incorporating an auto-pricker mechanism.

It’s possible that rather than put it into production to compare unfavourably against a majority of similar stoves with auto-pricker function, a measure of lateral thinking prompted the flip to butane fuel.

The RM Rambler is a better example of liquid fuelled-to-butane fuelled stove metamorphosis, in that there’s no filler cap liable to be unscrewed, releasing the butane. The central filler valve is self-sealing after filling or removal of the burner.






It’s immaterial whether the liquid fuel wick remains in the Esaza. What’s more important is that the fuel pickup pipe inside the tank is bent upwards to take gaseous butane from above the liquefied butane charge. If the gasoline pickup pipe remains, with no pre-heater loop on the burner the stove would provide ‘interesting’ start-up with an excess of smoky yellow flames. In that respect, the RM Rambler is fed gaseous butane from the top of the tank, so no such drama.

John

 

@presscall clear John.

I can confirm that there is no wick and that the pick up tube seems to be bent upward as you suggest and it looks more flat than circular (pick up tube section)… visibility is scarce from filler.

As soon as I get the used one I will dismantle to see it better, I want to keep my NOS one untouched.

Nicola

 

picture showing double walled tank
first time i count thats design
@presscall ?
typical liquid gas generator wick
in lpg design need to be antiflow and antifrozen system part
mean - imo need to be different then typical

 

It looks that way, yes, but there would be nothing to be gained from the extra complication and expense of manufacture.

 

To my unedudated eye it looks like the Spanish Patent is for the Optimus 8's design [for a liquid fueled (naphtha?) stove.] I recall that Armas Star and Llama copied popular FN and Colt pistol designs because under Spanish law, international patents held no sway unless also filed in Spain.
From what I gather, butane is more prevalent in Spain than White Gasoline, so they reconfigured the Esaza.
How usable is it? Can one obtain fill nozzles or an adapter to fill?