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I agree, but OTOH less flow makes everything else more critical
and a higher temp drop across the radiator is needed.
It's true that changing the flow rate
will change the equilibrium temp of the coolant. That's the
reason the Davies Craig controller works. The only real question is
how much flow is enough. There are so many variables, that I defy
anyone to calculate this for anyone's aircraft with any real accuracy.
Todd is probably doing a little better than 9 GPM as that was
measured at 12 V. He also got 7.7 GPM with a couple of GM evap cores which
is still better than I'm doing with one pump.
I'm hoping that his instruments were more
accurate than yours. IIRC, your gauge started at 5 psi, so I would
not expect it to be at it's best accuracy at that level. At least I'm
hoping it's not reading too high :-)
I ended up ordering a paddlewheel
flowmeter that has a 3-30 gpm range. ( http://www.mcmaster.com search for item
number 3562K13) As far as I can tell, it does not have a remote readout option,
but that's fine. It's about $120 cheaper than the last one, and should be
much better as well. I still haven't decided if I'll mess with it this
weekend. I'd like to, but I have so much other stuff that's more important
to do. I might just play with both pumps in the garage next week
sometime.
I might also conclude that the pump is over designed for 100
HP per rotor. :)
Agreed. The larger
Meziere pump you're looking at is billed as being suitable for high HP
applications. Let's face it, 200 ain't "high HP". I don't think
there's any doubt that the stock pump is overkill.
I think the only way the EWP will ever
be truly accepted by this group (the other group is hopeless) is when there are
numerous flying examples. Right now, Todd is the only one who gets
full credit, but that's not good enough because he lives in the "great white
north". I have no real motivation to change my system, other than wanting
to prove that this works. Not sure if that will be enough
motivation though.
Cheers,
Rusty (I believe)
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