My thoughts and experiences with condensation…as well as a few speculations…
First, I don’t think changing the angle of the footjoint is going to do much to keep the tone clear. If the water flows down far enough to drain through the vent holes, it only has a bit further to go to drain out the end.
I think it is the water in the headjoint more than anywhere else in the flute that affects the strength of tone. Especially if the water beads, so that surface tension keeps it from running down until there is quite a lot of it, it really deadens the the sound, and makes the whole flute stuffy. My own thought is that it effectively constricts the headjoint bore; I suppose another view would be that the water droplets absorb some of the energy from the standing wave within the flute, lessening the power of its tone.
Polymers build up water like nobody’s business–playing outside at night before, I have had a continuous trickle out of the end of the flute, almost like a faucet left barely on.
Some flutes are more affected by droplet buildup than others. The M&E flutes, for instance, don’t change much at all, and neither does the Boehm-system Gemeinhardt. The Seery and the Hamilton don’t stop responding but they don’t play their best either. The antique 8-key can get so stuffy it almost stops responding until you blow or swab it clear.
Sometimes the water will run out on its own, and you’re ok; other times it’ll bead up. There doesn’t seem to be much rhyme or reason, but the weather does seem to affect it–especially the wooden flutes seem to play their best on rainy, moist days. Dry sunny days aren’t the best, especially for the antique flute.
I have always thought one reason oiling the bore improves the tone is it gives these droplets of water a smoother, lower friction surface to run down so that they exit the bore on their own. I think the reason the silver flute doesn’t have much trouble is it already has a very smooth, highly polished surface for the water to run down.
Now for all that, I wish I could tell you I’ve come up with a better way to handle the moisture. I haven’t; if I’m playing informally I just blow it out with force and ignore the awful sound that makes–if I’m playing in a more formal setting then I find a minute to swab the moisture out.
–James