I'm not too concerned with the impeller rubbing in this prototype, it's served it's purpose, and given us important practical results to add to overall water block theory.
BP geometry is something I'll have to ponder over, I'd like to knurl the copper surface I have already, or have a really small version of chequer plate finish on the copper.
whatever it is it must be low profile(since it will have an impeller spinning just above it) and will have to made in such a way that it avoids having structures that will trap water and create partial dead spots.
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feel free to icq/msn me, I'm always willing to toss around ideas.
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