This afternoon I made another try. I shaped a length of 10mm (od.) copper tube to a ring (resembling a question mark) and drilled a number of 1mm holes for air jets in it to sit around one of the Origo stove’s burner. I first connected it to only one outlet of the aquarium pump (from now on called the booster). It definitely improves combustion, but there is not enough oomph in it to turn the flame fully blue. I then fed both outlets to that copper tube, and even drilled more holes in it. I am unsure of this. It could be that the pressure is on the low side or that the air capacity is insufficient. After all, the booster's combined capacity of 360 litre/hour is only 100ccm per second.
Anyway, before I again hook up the car tyre pump, I will try to fix the tube to the stove and then find if time to boil 0.5litre of water is shorter with the booster on than with it off.
Here is from today’s test, without and with the booster on.
Arne
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20170918 The Origo burner without the booster (air pump) connected
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20170918 seconds later: The booster is adding air to the flame via about 15 1mm air jets. Note the copper tube surrounding the burner.
(see photo album section 5)