Kyrre Aalerud wrote:

> Steel-wool is to maximize surface area, not to hinder flow.
> With the steel-wool we get some hindering of flow and so we need a pump that
> can handle a small ammount of pressure.

I see your point.  To reach a given outlet temperature, you can increase
heat transfer surface area, or decrease flow rate so that a given mass
of air stays in contact longer, receives more heat energy, and hence
rises in temperature more.  My emphasis has been on the latter, not the
former. By restricting flow sufficiently I could get the air hot enough
to melt bare solder in mid-air, but the actual air mass from the nozzle
was so small it couldn't transfer enough heat to the solder paste on the
board.

Yet it still worked fine on my 'digital' temperature sensor (read:
fingertip). <groan>

-Johnathan, AE6HO

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