Has anybody done some research on where to put water inlet for passive / pump-less cooling? I’ve seen several diy cones with the inlet at the tip, but looking at commercial boards I’ve seen the inlet on the side. I started thinking that maybe the water pressure is actually larger at the side than dead in the middle?
i do it on my tow boogie just the tube on the bottom of the boogie direct to esc is working fine, what you show on the picture must do it well
The picture is a screenshot from a Lift instruction video about water cooling maintenance. Forgot to say 
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I don’t think there will be any noticeable difference in stagnation pressure as long as the tube inlet is facing forward. Just think of the relative velocity of the water as it enters the tube. In the case of the Lift design, their nose cone gets pretty small at the front so the inlet needed to be offset a bit.
Are you sure you want a water cooling line though? I think having an esc passively cooled by being attached to a metal surface that is exposed to ambient air and water is simpler and effective for most applications
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A little off topic, but I plan to have a Pelicase on top of a board for both the battery and vesc.