Burner stand height

[big dave]

Another question for you fellas with some experience.

I have a 50 litre keg with the top cut out which I will use for my BIAB kettle, and I have bought a 3-ring burner to fire it up. The rounded bottom of the keg will not sit on the burner, so I will knock up a stand to sit it on. If I recall my year 10 chemistry class correctly, the bunsen burner flame is hottest at the blue flame tip. So the position above the flame might make some difference....?

What distance above the burner should I aim to have my kettle for best efficiency? What have you guys done with your set-ups?

Muchas gracias

BD

[billybushcook]

Dave
I set my 2 ring burner at just a height that I could get it out from under the keg,
I found on my first AG boil, that I could not get a good hard boil going & I figured it was because I had a blanket of air trapped under the keg within the rim, so I opened up the holes around the base a little with an angle grinder to generate better air flow & Whella! heaps better!

Mick.