Alcohol stove with 900 or 1300 pan

(I assume you mean the smaller pot requires less fuel to boil 2 cups).

Anyway, that does seem weird. I guess it means that the stove itself is not wasting any heat by heating up the area outside the bottom of the pan. At that point, the extra size of the bigger pot just means it is exposed to more cold air. That includes the top, but also the sides.

Yes, the smaller pot comes to a boil with 20% less fuel. Sides are fully inside the windscreen. I did wonder if this meant that, as the water is farther up the sides in the small pot, there is more opportunity for heat transfer.

It is impossible to really tell as fuel efficiency is a system level problem.  You would need to identify the stove the windscreen, the geometric spacing and so forth.  Pictures would help a lot.  My 2 cents.

Funnily enough it was the Bobcat stoves that arrived from you just a couple of days ago, but it also happened the same with a similar myog set up that I put together using a modified Starlyte.
I’m not too worried about it, was just curious if anyone else had experienced anything similar.

But what was the entire setup?  Please post pictures.

I use a Trail Designs Kojin, Ti Caldera windscreen, under an Evernew 600ml pot.  I’m completely satisfied with this system.  Provides a low center of gravity, stable, wind resistant, quiet and fuel efficient.  15ml (.5oz) fuel for a 2 cup boil in about 5 minutes.   Have used on 2 JMT’s, will be using again this summer.

I also have a Trail Designs CC, I just like messing with different stoves.

The set up was: EV900, Bobcat Jr st/steel screen, Bobcat Ti Lite stove and EV1300, Bobcat aluminum screen, Bobcat 2 stove. Both running on methanol. Water temp was around 10 deg. C. Air around 12.

here is a picture of my myog set up, this is the 1300, sitting on a 2 inch hardware cloth pot stand. The 900 set up is identical.

ironically I set this up for the photo and instead of the Starlyte I used the Bobcat that I’d just bought from Jon, got a nice rolling boil on 20mls of methanol, same air and water temps! Previously could only get to 94 deg C with 20 mls even in the TDCC.

For the Flat Cat Stoves, the optimal ground to pot distance is 1.8”. So a 0.2” higher distance makes a difference.

Jon

Does the optimal distance vary at all with fuel being used? The Bobcat wouldn’t boil 2 cups in the 1300 with 20ml at the standard distance. With 25ml it got to a boil and then carried on rocking for a couple of minutes.

One height works for all fuels in our windscreens.  Other windscreens are unknown.