Jack and Pi, thanks for your help. Yesterday I started the burner just before the alcohol extinguished, she lit with an irregular yellow flame but no smoke so I left it on and watched it a while, experimenting with different valve settings. After a while I achieved a steady blue flame, strong HISS. Shut it down, restarted and again got good results. My problem with the sooty smoke was obviously insufficient preheating; the gradual improvement of the uneven yellow flame I think was the old
fuel finally getting purged.
It''s a strong and uniform blue flame although it does form a slightly yellow cone around the burner, not sure if this is right but it heats well now with no visible smoke. I kept all
hatches and ports closed for a while to see how fast the cabin would heat up but I think in the future I''ll keep a
hatch open..there was a perceptible smell. Also, I think a CO detector would be in order...
Thanks again guys. Fair sailing,
Mike