As always my mind jumps to things based on past experience. Just the
way it is.
Not to be-labour that point, On the fairly large dual rotor machines,
which put out lots, but are, as it seems to me, prone to heat buildup,
could you not, cast a small hole in between the coils,preferably with
something you can remove after casting, that would allow air transfer
between the I.D., and the O.D.? A small set of blades on the
outside, or inside, would provide the flow. Or maybe just some creative
ducting. Not a big difference, but most of the bigger machines are
close to being Indestructable, except when MURPHY comes to visit.
Could this reduce the MURPHY effect.
(refer to murphy's law)
Just a thought,maybe errant.
bj